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Page 2 Volume 1 RM957U1 Volume 2 RM957U2 Y 2003 TOYOTA New Car Features NCF228U All information in this manual is based on the latest product information at the time of publication. However, specifications and procedures are subject to change without notice.
Page 3 A INTRODUCTION This manual consists of the following 13 sections: Section Description INDEX Index of the contents of this manual. INTRODUCTION Brief explanation of each section. HOW TO USE THIS Instructions on how to use this manual. MANUAL TROUBLE– Describes the basic inspection procedures for electrical circuits. SHOOTING ABBREVIATIONS Defines the abbreviations used in this manual.
Page 4 HOW TO USE THIS MANUAL B This manual provides information on the electrical circuits installed on vehicles by dividing them into a circuit for each system. The actual wiring of each system circuit is shown from the point where the power source is received from the battery as far as each ground point.
Page 5 B HOW TO USE THIS MANUAL ∗ The system shown here is an EXAMPLE ONLY. It is different to the actual circuit shown in the SYSTEM CIRCUITS SECTION. STOP LIGHT FROM POWER SOURCE SYSTEM (SEE PAGE 66) 7. 5A STOP GAUGE R–L @@@@...
Page 6 [A] : System Title [I] : Indicates the wiring color. Wire colors are indicated by an alphabetical code. [B] : Indicates a Relay Block. No shading is used and only the Relay Block No. is shown to distinguish it B = Black W = White BR = Brown from the J/B...
Page 7 B HOW TO USE THIS MANUAL SYSTEM OUTLINE Current is applied at all times through the STOP fuse to TERMINAL 2 of the stop light SW. When the ignition SW is turned on, current flows from the GAUGE fuse to TERMINAL 8 of the light failure sensor, and also flows through the rear lights warning light to TERMINAL 4 of the light failure sensor.
Page 8 [O] : Explains the system outline. [P] : Indicates values or explains the function for reference during troubleshooting. [Q] : Indicates the reference page showing the position on the vehicle of the parts in the system circuit. Example : Part ”L4” (Light Failure Sensor) is on page 36 of the manual. ∗...
Page 9 B HOW TO USE THIS MANUAL The ground points circuit diagram shows the connections from all major parts to the respective ground points. When troubleshooting a faulty ground point, checking the system circuits which use a common ground may help you identify the problem ground quickly.
Page 10 The ”Current Flow Chart” section, describes which parts each power source (fuses, fusible links, and circuit breakers) transmits current to. In the Power Source circuit diagram, the conditions when battery power is supplied to each system are explained. Since all System Circuit diagrams start from the power source, the power source system must be fully understood.
Page 11 B HOW TO USE THIS MANUAL K CONNECTOR LIST DARK GRAY GRAY BLACK A B B A A B C C C 6 7 8 DARK GRAY A B B A A B C C C GRAY BLACK 1 2 3 6 7 8 9 101112 3 4 5 6 8 GRAY...
Page 12 [B] : Part Name [C] : Part Number Toyota Part Number are indicated. Not all of the above part numbers of the connector are established for the supply. In case of ordering a connector or terminal with wire, please confirm in advance if there is supply for it using Parts Catalog News”...
Page 13 C TROUBLESHOOTING VOLTAGE CHECK To Ignition SW IG Terminal (a) Establish conditions in which voltage is present at the check point. Example: [A] – Ignition SW on Fuse [B] – Ignition SW and SW 1 on [C] – Ignition SW, SW 1 and Relay on (SW 2 off) (b) Using a voltmeter, connect the negative lead to a good ground point or negative battery terminal, and the positive lead to the connector or component terminal.
Page 14 FINDING A SHORT CIRCUIT To Ignition SW IG Terminal (a) Remove the blown fuse and disconnect all loads of the fuse. (b) Connect a test light in place of the fuse. (c) Establish conditions in which the test light comes on. Example: Test Light Fuse Case...
Page 15 C TROUBLESHOOTING HOW TO REPLACE TERMINAL Reference: (with terminal retainer or secondary locking device) 1. PREPARE THE SPECIAL TOOL HINT : To remove the terminal from the connector, please construct and use the special tool or like object shown on the left.
Page 16 Tool For Waterproof Type Connector Example: Terminal (Case 1) Tool Retainer HINT : Terminal retainer color is different according to connector body. Example: Terminal Retainer : Connector Body Black or White : Gray Black or White : Dark Gray Gray or White : Black Tool Access Hole...
Page 17 C TROUBLESHOOTING Push the terminal retainer down to the temporary lock position. Retainer at Full Lock Position Retainer at Temporary Lock Position [Male] [Female] (c) Release the locking lug from terminal and pull the terminal out Locking Lug from rear. Tool 4.
Page 18 ABBREVIATIONS D ABBREVIATIONS The following abbreviations are used in this manual. Anti–Lock Brake System Air Conditioning COMB. = Combination Direct Current Electronic Control Unit EMPS Electric Motor Power Steering Electronic Spark Advance EVAP Evaporative Emission Hybrid Vehicle Junction Block Left–Hand Positive Temperature Coefficient Relay Block Right–Hand...
Page 19 E GLOSSARY OF TERMS AND SYMBOLS GROUND BATTERY The point at which wiring attaches to Stores chemical energy and the Body, thereby providing a return converts it into electrical energy. path for an electrical circuit; without a Provides DC current for the auto’s ground, current cannot flow.
Page 20 SPEAKER RELAY An electromechanical device which Basically, an electrically operated creates sound waves from current 1. NORMALLY switch which may be normally flow. CLOSED closed (1) or open (2). Current flow through a small coil creates a magnetic field which either opens or closes an attached switch.
Page 21 F RELAY LOCATIONS [Engine Compartment] [Instrument Panel] 2003 PRIUS (EWD493U)
Page 22 [Body] 2003 PRIUS (EWD493U)
Page 23 F RELAY LOCATIONS Fusible Link Block No.1 Engine Compartment Left (See Page 20) 2003 PRIUS (EWD493U)
Page 24 Fusible Link Block No.2 Luggage Room Left (See Page 21) : Engine Room R/B No.2 Right Side of Reserve Tank (See Page 20) 2003 PRIUS (EWD493U)
Page 25 F RELAY LOCATIONS : Engine Room R/B No.3 Engine Compartment Right (See Page 20) 2003 PRIUS (EWD493U)
Page 26 MEMO 2003 PRIUS (EWD493U)
Page 27 F RELAY LOCATIONS : Engine Room J/B Engine Compartment Left (See Page 20) 2003 PRIUS (EWD493U)
Page 28 2003 PRIUS (EWD493U)
Page 29 F RELAY LOCATIONS [Engine Room J/B Inner Circuit] 2003 PRIUS (EWD493U)
Page 30 2003 PRIUS (EWD493U)
Page 31 F RELAY LOCATIONS : Instrument Panel J/B Cowl Side Panel LH (See Page 20) 2003 PRIUS (EWD493U)
Page 32 2003 PRIUS (EWD493U)
Page 33 F RELAY LOCATIONS [Instrument Panel J/B Inner Circuit] 2003 PRIUS (EWD493U)
Page 34 2003 PRIUS (EWD493U)
Page 35 G ELECTRICAL WIRING ROUTING Position of Parts in Engine Compartment A 1 A/C Condenser Fan Motor F 1 Front Airbag Sensor LH A 2 A/C Magnetic Clutch and Lock Sensor F 2 Front Airbag Sensor RH A 3 A/C Triple Pressure SW F 3 Front Parking Light LH (A/C Dual and Single Pressure SW) F 4 Front Parking Light RH...
Page 36 Position of Parts in Engine Compartment 1 Ignition Coil and Igniter No.1 N 1 Noise Filter (Ignition) 2 Ignition Coil and Igniter No.2 3 Ignition Coil and Igniter No.3 O 1 Oil Pressure SW 4 Ignition Coil and Igniter No.4 5 Injector No.1 R 1 Radiator Fan Motor 6 Injector No.2...
Page 37 G ELECTRICAL WIRING ROUTING Position of Parts in Instrument Panel A 7 A/C Amplifier C 7 Center Cluster SW A 8 A/C Amplifier C 8 Cigarette Lighter A 9 A/C Amplifier C10 Combination Meter A 10 A/C Room Temp. Sensor C 11 Combination Meter A 11 A/C Solar Sensor C12 Combination SW...
Page 38 Position of Parts in Instrument Panel G 1 Gateway ECU J 22 Junction Connector J 23 Junction Connector H 7 Hazard Warning SW J 24 Junction Connector H 8 Hazard Warning SW J 25 Junction Connector H 9 Heated Oxygen Sensor (Bank 1 Sensor 2) J 26 Junction Connector H10 Hybrid Vehicle Control ECU J 27 Junction Connector...
Page 39 G ELECTRICAL WIRING ROUTING Position of Parts in Body A 23 ABS Speed Sensor Rear LH F 14 Front Door Speaker LH A 24 ABS Speed Sensor Rear RH F 15 Front Door Speaker RH F 16 Fuel Pump and Fuel Sender B 15 Battery Blower Motor F 17 Fusible Link Block No.2 B 16 Battery Blower Motor Controller...
Page 40 Position of Parts in Body N 2 Navigation ECU S 4 Side Airbag Sensor LH N 3 Navigation ECU S 5 Side Airbag Sensor RH N 4 Noise Filter (Rear Window Defogger) S 6 Side Airbag Squib LH S 7 Side Airbag Squib RH P 5 Personal Light S 8 System Main Relay P 6 Power Window Control SW Front RH...
Page 41 G ELECTRICAL WIRING ROUTING : Location of Connector Joining Wire Harness and Wire Harness : Location of Ground Points : Location of Splice Points 2003 PRIUS (EWD493U)
Page 42 Connector Joining Wire Harness and Wire Harness DARK GRAY Code Joining Wire Harness and Wire Harness (Connector Location) Engine Wire and Engine No.4 Wire (Near the Radiator Fan) 2003 PRIUS (EWD493U)
Page 43 G ELECTRICAL WIRING ROUTING : Location of Connector Joining Wire Harness and Wire Harness : Location of Ground Points 2003 PRIUS (EWD493U)
Page 44 Connector Joining Wire Harness and Wire Harness Code Joining Wire Harness and Wire Harness (Connector Location) Engine Room Main Wire and Cowl Wire (Cowl Side Panel LH) Engine Room Main Wire and Cowl Wire (Cowl Side Panel LH) Floor Wire and Cowl Wire (Cowl Side Panel LH) Front Door LH Wire and Cowl Wire (Left Kick Panel) Instrument Panel Wire and Cowl Wire (Left Kick Panel) Instrument Panel Wire and Cowl Wire (Left Kick Panel)
Page 45 G ELECTRICAL WIRING ROUTING : Location of Connector Joining Wire Harness and Wire Harness : Location of Splice Points 2003 PRIUS (EWD493U)
Page 46 Connector Joining Wire Harness and Wire Harness Code Joining Wire Harness and Wire Harness (Connector Location) Instrument Panel Wire and A/C Sub Wire (Instrument Panel Brace LH) Floor No 3 Wire and Instrument Panel Wire (Under the Instrument Panel Center) Floor No.3 Wire and Instrument Panel Wire (Under the Instrument Panel Center) Engine Wire and Engine Room Main Wire (Right Kick Panel) Instrument Panel Wire and Engine Room Main Wire (Right Kick Panel)
Page 47 G ELECTRICAL WIRING ROUTING : Location of Connector Joining Wire Harness and Wire Harness : Location of Ground Points : Location of Splice Points 2003 PRIUS (EWD493U)
Page 48 Connector Joining Wire Harness and Wire Harness GRAY 1 2 3 4 5 1 2 3 4 5 5 4 3 2 1 5 4 3 2 1 6 7 8 9 10 6 7 8 9 10 10 9 8 7 6 10 9 8 7 6 1 2 3 4 5 6 7 8...
Page 49 MEMO 2003 PRIUS (EWD493U)
Page 50: Table Of Contents
TOYOTA HYBRID SYSTEM ........
Page 51: Power Source
POWER SOURCE 50A HTR 30A RDI 30A CDS FAN 40A ABS NO. 1 W–R 50A EMPS B–R 15A AM2 W–R W–R 50A HTR3 15A EFI 10A HORN 100A 30A HTR2 DC/DC G–W 10A TURN–HAZ 30A HTR1 15A DOME B–R 15A THRO 10A ABS NO.
Page 52 * 1 : W/O DAYTIME RUNNING LIGHT 30A POWER * 2 : W/ DAYTIME RUNNING LIGHT 10A SRS ACC 30A DOOR 40A DEF 5A AM1 15A CIG W–G ACC RELAY 10A ACC 15A STOP IGNITION SW P–L 20A PWR1 B–Y IG1 RELAY 10A HTR 7.
Page 53 POWER SOURCE SERVICE HINTS HEAD RELAY 2–1 : Closed with the light control SW at HEAD position or the dimmer SW at FLASH position Closed with the engine running and the parking brake pedal released (Parking brake SW off) [w/ Daytime running light] TAIL RELAY 5–3 : Closed with the light control SW at TAIL or HEAD position I15 IGNITION SW...
Page 54 MEMO 2003 PRIUS (EWD493U)
Page 55 TOYOTA HYBRID SYSTEM HYBRID VEHICLE CONTROL ECU IGSW ST1– GND1 GND2 B–W B–W R–W 5 2B IGNITION SW 11 2G B–W RELAY CRUISE RES/ACC SET/COAST CANCEL , F13 FUSIBLE LINK BLOCK NO. 1 CRUISE CONTROL SW [COMB. SW] , J19...
Page 56 * 1 : SHIELDED HYBRID VEHICLE CONTROL ECU VCP1 VPA1 VCP2 VPA2 VSFT GSFT 12 D 15 D VSFT GSFT VCP1 VPA1 VCP2 VPA2 ACCEL POSITION SENSOR PARK/NEUTRAL POSITION SW , J25 JUNCTION CONNECTOR W–B W–B W–B W–B W–B JUNCTION CONNECTOR 2003 PRIUS (EWD493U)
Page 57 TOYOTA HYBRID SYSTEM , H11 , H12 , H13 , H14 HYBRID VEHICLE CONTROL ECU GSNG GRFG GCSG GMTG MSNG (* 1) GSNG GRFG GCSG GMTG MSNG M 2 A , M 4 MOTOR GENERATOR MOTOR GENERATOR NO. 1 NO. 2...
Page 58 * 1 : SHIELDED , H11 , H12 , H13 , H14 HYBRID VEHICLE CONTROL ECU MCSG MRFG MMTG ETH+ ETH– HTE+ HTE– ESTP SPDO 21 C ETH+ ETH– HTE+ HTE– ESTP SPHV (* 1) , E10 ENGINE CONTROL MODULE MPX1 MPX2 MCSG...
Page 59 TOYOTA HYBRID SYSTEM , H11 , H12 , H13 , H14 HYBRID VEHICLE CONTROL ECU MSIV MSDN MIVG MIVA MIVB MIWB MIWA GIVA GIVB GIWB GIWA (* 1) M–SINV M–SDOWN M–INVT M–WU M–UU M–VU M–GINV M–IVA M–IVB M–IWB M–IWA G–IVA G–IVB...
Page 60 * 1 : SHIELDED * 2 : HIGH VOLTAGE ( 273. 6V ) , H11 , H12 , H13 , H14 HYBRID VEHICLE CONTROL ECU GSDN GIVG MFIV GSIV GFIV NODD FROM POWER SOURCE SYSTEM ( SEE PAGE 50 ) 12 IA1 W–G (* 1)
Page 61 TOYOTA HYBRID SYSTEM , H11 , H12 , H13 , H14 HYBRID VEHICLE CONTROL ECU SPDI FROM POWER SOURCE SYSTEM ( SEE PAGE 50 ) GAUGE DOME , J28 JUNCTION CONNECTOR W–G W–G , C11 COMBINATION METER 1 IH1 O ( *2 )
Page 62 * 1 : SHIELDED * 2 : HIGH VOLTAGE ( 273. 6V ) , H11 , H12 , H13 , H14 HYBRID VEHICLE CONTROL ECU HTD+ HTD– DTH+ DTH– CON1 CON2 CON3 W–G W–G O(* 2) O ( * 2 ) W–B W–B W–B...
Page 63 TOYOTA HYBRID SYSTEM , H11 , H12 , H13 , H14 HYBRID VEHICLE CONTROL ECU AS1G HTB+ HTB– BTH+ BTH– WFSE 20 D 30 D 18 D JUNCTION CONNECTOR HVI+ HVI– HVO+ HVO– BRAKE ECU W–G W–G JUNCTION CONNECTOR DATA LINK...
Page 64 * 2 : HIGH VOLTAGE ( 273. 6V ) FROM POWER SOURCE SYSTEM ( SEE PAGE 50 ) , H11 , H12 , H13 , H14 HYBRID VEHICLE CONTROL ECU BATT FAN ABFS FCVC BATT MREL 11 1F 4 IA1 GSW2 HEVC LG–R...
Page 65: Cruise Control
TOYOTA HYBRID SYSTEM SYSTEM OUTLINE FEATURES OF TOYOTA HYBRID SYSTEM This system controls the following modes in order to achieve the most efficient operations to match the driving conditions. (1) Supply of electrical power from the HV battery to motor generator no.2 provides force to drive the wheels.
Page 66 6. MANUAL CANCEL CONTROL When each of the following signals is input during driving with cruise control, the cruise control is released with turning the cruise control requirement to 0. (The memorized speed is maintained when following signals except the signal, main switch OFF is input.) ∗...
Page 67 TOYOTA HYBRID SYSTEM : RELAY BLOCKS Code See Page Relay Blocks (Relay Block Location) Engine Room R/B No.2 (Right Side of Reserve Tank) : JUNCTION BLOCK AND WIRE HARNESS CONNECTOR Code See Page Junction Block and Wire Harness (Connector Location)
Page 68 MEMO 2003 PRIUS (EWD493U)
Page 69: Engine Control
ENGINE CONTROL B–W B–W B–W B–W FROM POWER SOURCE SYSTEM (SEE PAGE 50) IGNITION SW RELAY RELAY R–W G–R G–R BATTERY JUNCTION CONNECTOR 2003 PRIUS (EWD493U)
Page 70 B–W B–W B–W B–W B–W B–W B–W W–B W–B W–B W–B W–B B–R B–R B–R IGSW IGT1 IGT2 IGT3 IGT4 , E 9 ENGINE CONTROL MODULE BATT MREL EVP1 MOPS G–R G–R ( * 1 ) * 1 : SHIELDED 2003 PRIUS (EWD493U)
Page 71 ENGINE CONTROL B–W B–W B–W B–W THROTTLE CONTROL MOTOR # 20 # 30 # 40 M– GE01 , E 9 ENGINE CONTROL MODULE HCLS PTNK VTA2 Y–R VTA1 VTA2 HCLS PTNK Y–R VAPOR PRESSURE SENSOR ( * 1 ) ( * 1 ) (* 1) 2003 PRIUS (EWD493U)
Page 72 FROM POWER SOURCE SYSTEM ( SEE PAGE 50 ) * 1 : SHIELDED G–W STOP , H14 HYBRID VEHICLE CONTROL ECU SPDO HTE– HTE+ ETH+ ETH1 ESTP (* 1) (* 1) OCV+ OCV– SPHV HTE– HTE+ ETH+ ETH– ESTP , E 9 ENGINE CONTROL MODULE HT1A OX1A...
Page 73 ENGINE CONTROL FROM POWER SOURCE SYSTEM ( SEE PAGE 50 ) THRO P–B W–L G–R A/C AMPLIFIER GR–L JUNCTION CONNECTOR (* 1) (* 1) (* 1) (* 1) MPX1 MPX2 , E 8 , E10 ENGINE CONTROL MODULE KNK1 NE– ME01 ( * 1 ) (* 1)
Page 74 FROM POWER SOURCE SYSTEM ( SEE PAGE 50 ) * 1 : SHIELDED 7. 5A OBDI I GAUGE P–B W–L G–R GR–L MPX– (* 1) MPX+ (* 1) , C11 COMBINATION METER MPD2 MPD1 MALFUNCTION INDICATOR LAMP DATA LINK CONNECTOR 3 J24 A JUNCTION JUNCTION...
Page 75 ENGINE CONTROL SYSTEM OUTLINE This system utilizes an engine control module and maintains overall control of the engine, transmission and so on. An outline of the engine control is explained here. 1. INPUT SIGNALS (1) Engine coolant temp. signal circuit The engine coolant temp.
Page 76 SERVICE HINTS E7 (A), E8 (B), E9 (C), E10 (D) ENGINE CONTROL MODULE BATT–E1 : Always approx. 9–14 volts +B–E1 : 9–14 volts with the ignition SW on and the engine stopping VC–E2 : 4.5–5.5 volts with the ignition SW on and the engine stopping IGF–E1 : Pulse generation with the engine idling THA–E2 : 0.5–3.4 volts with the engine idling and the intake air temp.
Page 77 ENGINE CONTROL : JUNCTION BLOCK AND WIRE HARNESS CONNECTOR Code See Page Junction Block and Wire Harness (Connector Location) Engine Wire and Engine Room J/B (Engine Compartment Left) Engine Room Main Wire and Engine Room J/B (Engine Compartment Left) Engine Room Main Wire and Engine Room J/B (Engine Compartment Left) Instrument Panel Wire and Instrument Panel J/B (Cowl Side Panel LH) Instrument Panel Wire and Instrument Panel J/B (Cowl Side Panel LH) Engine Room Main Wire and Instrument Panel J/B (Cowl Side Panel LH)
Page 78 MEMO 2003 PRIUS (EWD493U)
Page 79: Hybrid Vehicle Immobiliser System
HYBRID VEHICLE IMMOBILISER SYSTEM FROM POWER SOURCE SYSTEM ( SEE PAGE 50 ) 7. 5A ECU–B IGNITION SW J24 A JUNCTION CONNECTOR DATA LINK HYBRID VEHICLE CONNECTOR 3 CONTROL ECU FCVC JUNCTION CONNECTOR HEVC TRANSPONDER KEY COMPUTER LG–B W–B JUNCTION CONNECTOR JUNCTION CONNECTOR...
Page 80 SERVICE HINTS T4 TRANSPONDER KEY COMPUTER 1–GROUND : Always approx. 12 volts 12–GROUND : Always continuity U1 UNLOCK WARNING SW 1–2 : Closed with the ignition key in cylinder : PARTS LOCATION Code See Page Code See Page Code See Page : JUNCTION BLOCK AND WIRE HARNESS CONNECTOR Code See Page...
Page 81: Headlight (W/ Daytime Running Light)
HEADLIGHT (w/ DAYTIME RUNNING LIGHT) FROM POWER SOURCE SYSTEM ( SEE PAGE 50 ) 7. 5A RELAY HEAD HEAD R–L R–W RELAY R–G RELAY R–G R–G R–B R–B HEADLIGHT HEADLIGHT JUNCTION CONNECTOR 2003 PRIUS (EWD493U)
Page 82 FROM POWER SOURCE SYSTEM ( SEE PAGE 50 ) 7. 5A ECU–B GAUGE DOME R–W R–G JUNCTION CONNECTOR R–G R–G DAYTIME RUNNING LIGHT RELAY H–LP DIODE (DAYTIME RUNNING CHG– LIGHT) R–B 7 2I 2 2G R–G 10 2A 4 2A R–G JUNCTION CONNECTOR...
Page 83 HEADLIGHT (w/ DAYTIME RUNNING LIGHT) SYSTEM OUTLINE When the ignition SW is turned on ST position and ”READY” signal from engine control module is sent to the daytime running light relay via body ECU. If the parking brake pedal is depressed (Parking brake SW is on) at that time, the daytime running light system does not operate.
Page 84 : SPLICE POINTS Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points Engine Room Main Wire 2003 PRIUS (EWD493U)
Page 85: Headlight (W/O Daytime Running Light)
HEADLIGHT (w/o DAYTIME RUNNING LIGHT) SHORT HEAD SHORT RELAY HEAD HEAD (LH) (RH) HEADLIGHT HEADLIGHT JUNCTION R–G CONNECTOR R–W R–Y HRLY R–Y R–G TAIL HEAD HIGH FLASH BATTERY COMBINATION JUNCTION CONNECTOR 2003 PRIUS (EWD493U)
Page 86 FROM POWER SOURCE SYSTEM ( SEE PAGE 50 ) DOME 2 2G 4 2A 7 2A 6 2B 2003 PRIUS (EWD493U)
Page 87 HEADLIGHT (w/o DAYTIME RUNNING LIGHT) SERVICE HINTS HEAD RELAY 1–2 : Closed with the light control SW at HEAD position or the dimmer SW at FLASH position C13 COMBINATION SW 13–16 : Continuity with the light control SW at HEAD position 8–16 : Continuity with the dimmer SW at FLASH position 7–16 : Continuity with the dimmer SW at HIGH or FLASH position : PARTS LOCATION...
Page 88 MEMO 2003 PRIUS (EWD493U)
Page 89 TAILLIGHT 7. 5A TAIL TAIL RELAY , J 5 JUNCTION CONNECTOR TRLY BODY TAIL W–B W–B HEAD JUNCTION CONNECTOR BATTERY JUNCTION JUNCTION CONNECTOR CONNECTOR 2003 PRIUS (EWD493U)
Page 90 , J33 JUNCTION CONNECTOR , J33 JUNCTION CONNECTOR W–B 2003 PRIUS (EWD493U)
Page 91 TAILLIGHT SERVICE HINTS TAIL RELAY 5–3 : Closed with the light control SW at TAIL or HEAD position : PARTS LOCATION Code See Page Code See Page Code See Page : JUNCTION BLOCK AND WIRE HARNESS CONNECTOR Code See Page Junction Block and Wire Harness (Connector Location) Engine Room Main Wire and Instrument Panel J/B (Cowl Side Panel LH) Engine Room Main Wire and Instrument Panel J/B (Cowl Side Panel LH)
Page 92 MEMO 2003 PRIUS (EWD493U)
Page 93: Illumination
ILLUMINATION TAIL RELAY PANEL TRLY BODY TAIL HEAD W–L BATTERY JUNCTION CONNECTOR 2003 PRIUS (EWD493U)
Page 94 FROM POWER SOURCE SYSTEM ( SEE PAGE 50 ) DOME , J28 JUNCTION CONNECTOR ILL– LG–R W–B W–L W–L JUNCTION CONNECTOR W–L W–B JUNCTION CONNECTOR 2003 PRIUS (EWD493U)
Page 95 ILLUMINATION SERVICE HINTS TAIL RELAY 5–3 : Closed with the light control SW at TAIL or HEAD position C13 COMBINATION SW 14–16 : Closed with the light control SW at TAIL or HEAD position : PARTS LOCATION Code See Page Code See Page Code...
Page 96 MEMO 2003 PRIUS (EWD493U)
Page 97 TURN SIGNAL AND HAZARD WARNING LIGHT FROM POWER SOURCE SYSTEM ( SEE PAGE 50 ) W–B TURN–HAZ GAUGE TURN SIGNAL FLASHER RELAY TURN SIGNAL SW [COMB. SW] W–B JUNCTION CONNECTOR G–Y JUNCTION JUNCTION CONNECTOR CONNECTOR 2003 PRIUS (EWD493U)
Page 98 W–B TURN SIGNAL INDICATOR LIGHT [COMB. METER] , J23 JUNCTION CONNECTOR JUNCTION CONNECTOR , J33 JUNCTION CONNECTOR JUNCTION CONNECTOR 2003 PRIUS (EWD493U)
Page 99 TURN SIGNAL AND HAZARD WARNING LIGHT SERVICE HINTS T5 TURN SIGNAL FLASHER RELAY 1–GROUND : Approx. 12 volts with the ignition SW at ON position 4–GROUND : Always approx. 12 volts 2, 3–GROUND : Changes from approx. 12 to 0 volts with the ignition SW at ON position and the turn signal SW at LEFT or RIGHT position or the hazard SW at ON position 5–GROUND : Continuity with the turn signal SW at LEFT position 6–GROUND : Continuity with the turn signal SW at RIGHT position...
Page 100 MEMO 2003 PRIUS (EWD493U)
Page 101 STOP LIGHT FROM POWER SOURCE SYSTEM ( SEE PAGE 50 ) STOP STOP LIGHT JUNCTION CONNECTOR , J31 JUNCTION CONNECTOR , J33 JUNCTION CONNECTOR W–B 2003 PRIUS (EWD493U)
Page 102 SERVICE HINTS S3 STOP LIGHT SW 2–1 : Closed with the brake pedal depressed : PARTS LOCATION Code See Page Code See Page Code See Page : JUNCTION BLOCK AND WIRE HARNESS CONNECTOR Code See Page Junction Block and Wire Harness (Connector Location) Cowl Wire and Instrument Panel J/B (Cowl Side Panel LH) : CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS Code...
Page 103: Back–Up Light
BACK–UP LIGHT FROM POWER SOURCE SYSTEM ( SEE PAGE 50 ) R–B GAUGE BACK–UP LIGHT RELAY , C11 COMBINATION METER MPX+ MPX+ MPX– MP2+ HTE+ HTE– MPD1 MPD2 MPX2 MPX1 HTE+ HTE– JUNCTION JUNCTION CONNECTOR CONNECTOR , E10 ENGINE CONTROL MODULE 2003 PRIUS (EWD493U)
Page 104 SERVICE HINTS P1 PARK/NEUTRAL POSITION SW 4–1 : Closed with the shift lever at R position B5 BACK–UP LIGHT RELAY 3–5 : Closed with the shift lever at R position : PARTS LOCATION Code See Page Code See Page Code See Page : JUNCTION BLOCK AND WIRE HARNESS CONNECTOR Code...
Page 105: Light Auto Turn Off
LIGHT AUTO TURN OFF FROM POWER SOURCE SYSTEM ( SEE PAGE 50 ) ( *1 ) 7. 5A (*2) GAUGE ECU–B HEAD 7. 5A TAIL (* 2) R–W ( * 2 ) H–LP R–W ( * 2 ) HRLY TRLY TAIL B 9 B BODY ECU...
Page 106 SYSTEM OUTLINE With the ignition SW turned on, the current flows to TERMINAL 15 of the body ECU through GAUGE fuse. Voltage is applied at all times to TERMINAL (B) 11 of the body ECU through the TAIL relay coil side, and to TERMINAL (B) 2 through the HEAD relay coil side (w/o daytime running light) or through the daytime running light relay (w/ daytime running light).
Page 107 LIGHT AUTO TURN OFF : CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS Code See Page Joining Wire Harness and Wire Harness (Connector Location) Engine Room Main Wire and Cowl Wire (Cowl Side Panel LH) Floor Wire and Cowl Wire (Cowl Side Panel LH) Instrument Panel Wire and Cowl Wire (Left Kick Panel) : GROUND POINTS Code...
Page 108 MEMO 2003 PRIUS (EWD493U)
Page 109: Interior Light
INTERIOR LIGHT FROM POWER SOURCE SYSTEM ( SEE PAGE 50 ) GR–B FROM POWER SOURCE SYSTEM ( SEE PAGE 50 ) GR–B DOME 7. 5A ECU–B MPD1 GATEWAY MPD2 MPX1 L–Y ENGINE CONTROL MODULE MPX2 , J31 JUNCTION CONNECTOR B 8 A , B 9 BODY ECU MPX+...
Page 110 GR–B GR–B MP2+ AMPLIFIER MPX+ , C11 COMBINATION METER 2003 PRIUS (EWD493U)
Page 111 INTERIOR LIGHT SERVICE HINTS B8 (A), B9 (B) BODY ECU 3–GROUND : Continuity with front LH door open 6–GROUND : Continuity with rear LH, RH door open (A)12–GROUND : Continuity with front RH door open (A)14–GROUND : Continuity with luggage compartment door open (B) 9–GROUND : Always approx.
Page 112 MEMO 2003 PRIUS (EWD493U)
Page 113 MULTIPLEX COMMUNICATION SYSTEM (COMMUNICATION BUS) MPX– BODY ECU MPX+ MPX2 ENGINE CONTROL MODULE MPX1 MPX+ COMBINATION METER MPX– MPD2 GATEWAY MPD1 MPX+ A/C AMPLIFIER MP2+ GR–B 2003 PRIUS (EWD493U)
Page 114 MEMO 2003 PRIUS (EWD493U)
Page 115: Key Reminder
KEY REMINDER AND LIGHT REMINDER BUZZER FROM POWER SOURCE SYSTEM ( SEE PAGE 50 ) ( * 1 ) 7. 5A (* 2) GAUGE ECU–B HEAD 7. 5A TAIL (* 2) R–W ( *2 ) H–LP R–W ( *2 ) HRLY TRLY TAIL...
Page 116 FROM POWER SOURCE SYSTEM ( SEE PAGE 50 ) * 1 : W/ DAYTIME RUNNING LIGHT * 2 : W/O DAYTIME RUNNING LIGHT DOME GR–B MPD1 MPD2 MP2+ MPX+ MPX1 MPX2 MPX– MPX+ , B 9 BODY ECU BUZZER , C11 COMBINATION METER JUNCTION CONNECTOR...
Page 117 KEY REMINDER AND LIGHT REMINDER BUZZER SYSTEM OUTLINE The current always flows from GAUGE fuse to body ECU TERMINAL 15. 1. LIGHT REMINDER BUZZER SYSTEM If you open the door of the driver’s side when either headlight or taillight is on with ignition SW being off, the buzzer comes 2.
Page 118 : GROUND POINTS Code See Page Ground Points Location Cowl Side Panel LH Cowl Side Panel RH Right Kick Panel 2003 PRIUS (EWD493U)
Page 119 SEAT BELT WARNING FROM POWER SOURCE SYSTEM ( SEE PAGE 50 ) GAUGE DOME GR–L MPD2 MPD1 MPX1 MPX2 MP2+ MPX+ MPX– MPX+ DBKL PKBL , B 9 BODY ECU , C11 COMBINATION METER W–B W–B 2003 PRIUS (EWD493U)
Page 120 SYSTEM OUTLINE When the driver has not fastened the seat belt while the ignition SW is ON, the driver seat belt warning light blinks, and a warning buzzer comes on. Also, in the front passenger seat, a sensor recognizes a passenger, and when the passenger has not fastened the seat belt, the front passenger seat belt warning light blinks.
Page 121 WIPER AND WASHER FROM POWER SOURCE SYSTEM (SEE PAGE 50) WASHER WIPER WIPER SW WASHER SW L–Y L–Y L–W L–B L–R FRONT WIPER AND WASHER SW [COMB. SW] JUNCTION CONNECTOR FRONT WIPER MOTOR W–B JUNCTION CONNECTOR JUNCTION JUNCTION CONNECTOR CONNECTOR 2003 PRIUS (EWD493U)
Page 122 SYSTEM OUTLINE When the ignition SW is turned ON, the current flows from WIPER fuse to wiper and washer SW TERMINAL 17 and front wiper motor TERMINAL 2 or the current flows from WASHER fuse to washer motor TERMINAL 2. 1.
Page 123: Cigarette Lighter
CIGARETTE LIGHTER FROM POWER SOURCE SYSTEM ( SEE PAGE 50 ) CIGARETTE LIGHTER JUNCTION CONNECTOR JUNCTION CONNECTOR 2003 PRIUS (EWD493U)
Page 124 SERVICE HINTS C8 CIGARETTE LIGHTER 2–GROUND : Approx. 12 volts with the ignition SW at ACC or ON position 1–GROUND : Always continuity : PARTS LOCATION Code See Page Code See Page Code See Page : JUNCTION BLOCK AND WIRE HARNESS CONNECTOR Code See Page Junction Block and Wire Harness (Connector Location)
Page 125 HORN FROM POWER SOURCE SYSTEM ( SEE PAGE 50 ) HORN HORN RELAY HORN JUNCTION CONNECTOR HORN SW [COMB. SW] 2003 PRIUS (EWD493U)
Page 126 SERVICE HINTS HORN RELAY 5–3 : Closed with the horn SW on : PARTS LOCATION Code See Page Code See Page Code See Page : JUNCTION BLOCK AND WIRE HARNESS CONNECTOR Code See Page Junction Block and Wire Harness (Connector Location) Engine Room Main Wire and Engine Room J/B (Engine Compartment Left) Engine Room Main Wire and Engine Room J/B (Engine Compartment Left) : CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS...
Page 127 POWER WINDOW FROM POWER SOURCE SYSTEM ( SEE PAGE 50 ) , B 9 BODY ECU 7. 5A DOME PWR1 GAUGE POWER ECU–B DCTY JUNCTION POWER CONNECTOR RELAY L–W L–W JUNCTION CONNECTOR L–W CPUB WLSW MPX1 POWER WINDOW MASTER SW SGND DCTY PULSE...
Page 128 , B 9 BODY ECU L–W L–W L–W 3 BB1 5 BA1 4 BA1 POWER WINDOW POWER WINDOW POWER WINDOW CONTROL SW CONTROL SW CONTROL SW FRONT RH REAR RH REAR LH POWER WINDOW POWER WINDOW POWER WINDOW MOTOR FRONT RH MOTOR REAR RH MOTOR REAR LH W–B...
Page 129 POWER WINDOW SYSTEM OUTLINE Communication between power window master SW and body ECU is controlled and body ECU recognizes the conditions of each SW to control the operation of windows. 1. MANUAL UP OR DOWN OPERATION (DRIVER’S WINDOW, PASSENGER’S WINDOW) During you are pushing power window master SW (Driver side) halfway down, the motor operates and the window on the driver’s side opens.
Page 130 : CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS Code See Page Joining Wire Harness and Wire Harness (Connector Location) Floor Wire and Cowl Wire (Cowl Side Panel LH) Front Door LH Wire and Cowl Wire (Left Kick Panel) Front Door LH Wire and Instrument Panel Wire (Left Kick Panel) Front Door RH Wire and Instrument Panel Wire (Right Kick Panel) Front Door RH Wire and Cowl Wire (Right Kick Panel) Rear Door No.2 Wire and Floor Wire (Center Pillar LH)
Page 131 REMOTE CONTROL MIRROR FROM POWER SOURCE SYSTEM ( SEE PAGE 50 ) JUNCTION CONNECTOR REMOTE CONTROL MIRROR SW , J25 JUNCTION CONNECTOR BR–R JUNCTION CONNECTOR JUNCTION CONNECTOR REMOTE CONTROL MIRROR LH REMOTE CONTROL MIRROR RH 2003 PRIUS (EWD493U)
Page 132 SERVICE HINTS R5 REMOTE CONTROL MIRROR SW 8–GROUND : Approx. 12 volts with the ignition SW at ACC or ON position 6–7 : Continuity with the operation SW at UP or LEFT position 8–6 : Continuity with the operation SW at DOWN or RIGHT position : PARTS LOCATION Code See Page...
Page 133 SHIFT LOCK FROM POWER SOURCE SYSTEM ( SEE PAGE 50 ) STOP ECU–IG J14 A STOP JUNCTION LIGHT CONNECTOR , J28 JUNCTION CONNECTOR , J15 JUNCTION CONNECTOR JUNCTION JUNCTION CONNECTOR CONNECTOR LOCK FREE SHIFT LOCK CONTROL SW L–R SLS+ SLS– SHIFT LOCK SOLENOID KLS+ SHIFT LOCK ECU...
Page 134 SYSTEM OUTLINE When the ignition SW is turned to ACC position the current from the ACC fuse flows to TERMINAL 1 of the shift lock ECU, in the ON position, the current from the ECU–IG fuse flows to TERMINAL 3 of the ECU. 1.
Page 135: Door Lock Control
DOOR LOCK CONTROL FROM POWER SOURCE SYSTEM ( SEE PAGE 50 ) 7. 5A DOME ECU–B DOOR GAUGE , B 9 BODY ECU RCTY JUNCTION CONNECTOR , J25 JUNCTION CONNECTOR L–Y W–B JUNCTION W–B CONNECTOR 2003 PRIUS (EWD493U)
Page 136 , B 9 BODY ECU PCTY DCTY ACTD POWER WINDOW MASTER SW MPX1 CPUB DCTY LSWD L–Y L–Y , J13 JUNCTION CONNECTOR R–W JUNCTION CONNECTOR R–W DOOR LOCK MOTOR, DOOR KEY LOCK AND UNLOCK SW AND DOOR UNLOCK DETECTION SW FRONT LH W–B 2003 PRIUS (EWD493U)
Page 137 DOOR LOCK CONTROL BODY ECU LSWP ACT+ ACT– W–L , J15 JUNCTION CONNECTOR DOOR LOCK MOTOR, DOOR KEY LOCK DOOR LOCK MOTOR AND DOOR LOCK MOTOR AND AND UNLOCK SW AND DOOR DOOR UNLOCK DOOR UNLOCK UNLOCK DETECTION SW FRONT RH DETECTION SW REAR RH DETECTION SW REAR LH W–B...
Page 138 , B 9 BODY ECU DOOR LOCK CONTROL SW FRONT RH W–B 2003 PRIUS (EWD493U)
Page 139 DOOR LOCK CONTROL SYSTEM OUTLINE The current is always sent from DOOR fuse to TERMINAL B of body ECU. When ignition SW is turned on, the current is sent from GAUGE fuse to TERMINAL IG of the body ECU. 1. MANUAL LOCK OPERATION When the door lock control SW (Power window master SW) is turned to LOCK position, the lock signal from TERMINAL MPX1 of power window master SW is input to TERMINAL RX of body ECU to operate ECU.
Page 140 : JUNCTION BLOCK AND WIRE HARNESS CONNECTOR Code See Page Junction Block and Wire Harness (Connector Location) Engine Room Main Wire and Engine Room J/B (Engine Compartment Left) Instrument Panel Wire and Instrument Panel J/B (Cowl Side Panel LH) Instrument Panel Wire and Instrument Panel J/B (Cowl Side Panel LH) Engine Room Main Wire and Instrument Panel J/B (Cowl Side Panel LH) Cowl Wire and Instrument Panel J/B (Cowl Side Panel LH) Floor Wire and Instrument Panel J/B (Cowl Side Panel LH)
Page 141 WIRELESS DOOR LOCK CONTROL FROM POWER SOURCE SYSTEM ( SEE PAGE 50 ) 7. 5A DOME ECU–B DOOR GAUGE , B 9 BODY ECU RCTY JUNCTION CONNECTOR WIRELESS DOOR CONTROL RECEIVER L–Y J23 B , J25 JUNCTION JUNCTION CONNECTOR CONNECTOR W–B W–B JUNCTION...
Page 142 , B 9 BODY ECU PCTY DCTY ACTD POWER WINDOW MASTER SW MPX1 CPUB DCTY LSWD L–Y , J13 JUNCTION CONNECTOR L–Y R–W R–W DOOR LOCK MOTOR, DOOR KEY LOCK AND UNLOCK SW AND DOOR UNLOCK DETECTION SW FRONT LH W–B 2003 PRIUS (EWD493U)
Page 143 WIRELESS DOOR LOCK CONTROL BODY ECU LSWP ACT+ ACT– W–L , J15 JUNCTION CONNECTOR DOOR LOCK MOTOR, DOOR KEY LOCK DOOR LOCK MOTOR AND DOOR LOCK MOTOR AND AND UNLOCK SW AND DOOR UNLOCK DOOR UNLOCK DOOR UNLOCK DETECTION SW FRONT RH DETECTION SW REAR RH DETECTION SW REAR LH W–B...
Page 144 , B 9 BODY ECU DOOR LOCK CONTROL SW FRONT RH W–B 2003 PRIUS (EWD493U)
Page 145 WIRELESS DOOR LOCK CONTROL SYSTEM OUTLINE The current is always sent from DOOR fuse to TERMINAL B of body ECU. At the same time, the current is always sent from DOME fuse to TERMINAL CPUB of power window master SW, and from ECU–B fuse to wireless door lock receiver. When ignition SW is turned on, the current is sent from GAUGE fuse to TERMINAL IG of body ECU.
Page 146 : JUNCTION BLOCK AND WIRE HARNESS CONNECTOR Code See Page Junction Block and Wire Harness (Connector Location) Engine Room Main Wire and Engine Room J/B (Engine Compartment Left) Instrument Panel Wire and Instrument Panel J/B (Cowl Side Panel LH) Instrument Panel Wire and Instrument Panel J/B (Cowl Side Panel LH) Engine Room Main Wire and Instrument Panel J/B (Cowl Side Panel LH) Cowl Wire and Instrument Panel J/B (Cowl Side Panel LH) Floor Wire and Instrument Panel J/B (Cowl Side Panel LH)
Page 147 THEFT DETERRENT FROM POWER SOURCE SYSTEM ( SEE PAGE 50 ) 7. 5A DOME ECU–B DOOR GAUGE , B 9 BODY ECU RCTY JUNCTION CONNECTOR L–Y L–Y W–B JUNCTION W–B CONNECTOR 2003 PRIUS (EWD493U)
Page 148 FROM POWER SOURCE SYSTEM ( SEE PAGE 50 ) 7. 5A OBDI I JUNCTION CONNECTOR W–L W–L , B 9 BODY ECU PCTY DCTY ACTD POWER WINDOW MASTER SW MPX1 CPUB DCTY LSWD L–Y , J13 JUNCTION CONNECTOR R–W JUNCTION CONNECTOR R–W DOOR LOCK MOTOR, DOOR KEY LOCK AND...
Page 149 THEFT DETERRENT BODY ECU LSWP ACT+ ACT– W–L , J15 JUNCTION CONNECTOR DOOR LOCK MOTOR, DOOR KEY LOCK DOOR LOCK MOTOR AND DOOR LOCK MOTOR AND AND UNLOCK SW AND DOOR UNLOCK DOOR UNLOCK DOOR UNLOCK DETECTION SW FRONT RH DETECTION SW REAR RH DETECTION SW REAR LH W–B...
Page 150: Horn
FROM POWER SOURCE SYSTEM ( SEE PAGE 50 ) HORN , B 9 BODY ECU HORN RELAY HCTY DOOR LOCK CONTROL SW FRONT RH , R 4 RADIO AND PLAYER W–B 2003 PRIUS (EWD493U)
Page 151 THEFT DETERRENT SERVICE HINTS D13 DOOR KEY LOCK AND UNLOCK SW AND DOOR UNLOCK DETECTION SW FRONT LH 6–3 : Closed with door lock cylinder unlocked with key 5–3 : Closed with door lock cylinder locked with key D14 DOOR KEY LOCK AND UNLOCK SW AND DOOR UNLOCK DETECTION SW FRONT RH 1–4 : Closed with door lock cylinder unlocked with key 2–4 : Closed with door lock cylinder locked with key E2 ENGINE HOOD COURTESY SW...
Page 152 : CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS Code See Page Joining Wire Harness and Wire Harness (Connector Location) Engine Room Main Wire and Cowl Wire (Cowl Side Panel LH) Floor Wire and Cowl Wire (Cowl Side Panel LH) Front Door LH Wire and Cowl Wire (Left Kick Panel) Instrument Panel Wire and Cowl Wire (Left Kick Panel) Instrument Panel Wire and Engine Room Main Wire (Left Kick Panel) Instrument Panel Wire and Floor Wire (Left Kick Panel)
Page 153: Radio And Player
RADIO AND PLAYER FROM POWER SOURCE SYSTEM ( SEE PAGE 50 ) DOME NAVIGATION AUI+ AUI– AUO+ AUO– L–Y JUNCTION CONNECTOR FRONT DOOR GR–R SPEAKER LH BU+B ACC+B FL– , R 3 , R 4 RADIO AND PLAYER FL– FR– RL–...
Page 154 * 1 : W/ NAVIGATION SYSTEM * 2 : W/O NAVIGATION SYSTEM MULTI DISPLAY CENTER CLUSTER SW TX– TX– EJCT JUNCTION CONNECTOR 12 C 11 C TX– ACC+B EJECT BU+B , R 3 , R 4 RADIO AND PLAYER 2003 PRIUS (EWD493U)
Page 155 RADIO AND PLAYER SERVICE HINTS R3 (B) RADIO AND PLAYER (B)4–GROUND : Always approx. 12 volts (B)3–GROUND : Approx. 12 volts with the ignition SW at ON or ACC position (B)7–GROUND : Always continuity N2 NAVIGATION ECU 9–GROUND : Always approx. 12 volts 18–GROUND : Approx.
Page 156 MEMO 2003 PRIUS (EWD493U)
Page 157: Navigation System
NAVIGATION SYSTEM FROM POWER SOURCE SYSTEM ( SEE PAGE 50 ) GATEWAY ECU DOME ECU–IG GTX– GTX+ , M 7 MULTI DISPLAY 11 A TX3– TX3+ TX1+ TX1– 14 A B–Y GR–R L–Y JUNCTION CONNECTOR PARKING BRAKE SW DATA LINK CONNECTOR 3 10 B TX1+...
Page 158 FROM POWER SOURCE SYSTEM (SEE PAGE 50) CENTER GAUGE CLUSTER SW , M 6 TX– MULTI DISPLAY GND1 SYNC TX– JUNCTION CONNECTOR R–L JUNCTION CONNECTOR TX– BACK–UP LIGHT RELAY RADIO AND PLAYER JUNCTION CONNECTOR SYNC , C11 NAVIGATION ECU COMBINATION METER 2003 PRIUS (EWD493U)
Page 159 NAVIGATION SYSTEM SERVICE HINTS N2 (A) NAVIGATION ECU (A) 9–GROUND : Always approx. 12 volts (A)18–GROUND : Approx. 12 volts with the ignition SW at ON or ACC position (A)17–GROUND : Always continuity M7 (C) MULTI DISPLAY (C)2–GROUND : Approx. 12 volts with the ignition SW at ON position (C)4–GROUND : Approx.
Page 160 MEMO 2003 PRIUS (EWD493U)
Page 161: Gateway System
GATEWAY SYSTEM FROM POWER SOURCE SYSTEM ( SEE PAGE 50 ) 7. 5A ECU–B ECU–IG JUNCTION CONNECTOR GR–L , J28 JUNCTION CONNECTOR MPX1 ENGINE CONTROL MPX2 MODULE JUNCTION CONNECTOR MPX– BODY GATEWAY ECU MPX+ BATT MPD2 GTX– GTX+ MPD1 MPX+ COMBINATION METER JUNCTION...
Page 162 SERVICE HINTS G1 GATEWAY ECU 8–GROUND : Always approx. 12 volts 2–GROUND : Approx. 12 volts with the ignition SW at ON position 9–GROUND : Approx. 12 volts with the ignition SW at ACC or ON position 7, 14–GROUND : Always continuity : PARTS LOCATION Code See Page...
Page 163: Electric Tension Reducer
ELECTRIC TENSION REDUCER FROM POWER SOURCE SYSTEM ( SEE PAGE 50 ) ECU–IG TENSION REDUCER SOLENOID TENSION REDUCER LH [BUCKLE SW LH] , J23 JUNCTION CONNECTOR JUNCTION CONNECTOR JUNCTION CONNECTOR 2003 PRIUS (EWD493U)
Page 164 SERVICE HINTS T6 TENSION REDUCER SOLENOID 1–GROUND : Approx. 12 volts with the ignition SW at ON position B20 TENSION REDUCER LH [BUCKLE SW LH] 1–3 : Closed with driver’s seat belt in use : PARTS LOCATION Code See Page Code See Page Code...
Page 165: Emps
EMPS FROM POWER SOURCE SYSTEM ( SEE PAGE 50 ) GR–G 7. 5A GAUGE EMPS ECU–B ECU–IG P–B JUNCTION CONNECTOR , J15 JUNCTION CONNECTOR DATA LINK CONNECTOR 3 , E 4 , E 5 , E 6 EMPS ECU EMPS RELAY 2003 PRIUS (EWD493U)
Page 166 GR–G GR–G P–B P–B JUNCTION CONNECTOR , E 4 , E 5 , E 6 EMPS ECU PGND TRQV TRQ1 TRQ2 TRQG STEERING SHAFT BRAKE ECU TORQUE SENSOR , J19 JUNCTION CONNECTOR W–B JUNCTION CONNECTOR 2003 PRIUS (EWD493U)
Page 167 EMPS SYSTEM OUTLINE In this system, the controller determines the direction and the amount of the assistant force based on the signals from the vehicle speed sensor and the torque sensor that is built in the gear box. The controller then assists the operation of the steering wheel by controlling the DC motor installed in the steering gear box.
Page 168 NOTICE: When inspecting or repairing the SRS, perform the operation in accordance with the following precautionary instructions and the procedure and precautions in the Repair Manual for the applicable model year. D Malfunction symptoms of the SRS are difficult to confirm, so the DTCs become the most important source of information when troubleshooting.
Page 169 FROM POWER SOURCE SYSTEM ( SEE PAGE 50 ) SRS ACC IGNITION SW HYBRID VEHICLE SIDE AIRBAG SENSOR LH SIDE AIRBAG SENSOR RH CONTROL ECU ABFS GSW2 VUPL SSL+ SSL– VUPR SSR+ SSR– , A18 , A19 AIRBAG SENSOR ASSEMBLY D–...
Page 170 FROM POWER SOURCE SYSTEM ( SEE PAGE 50 ) * 1 : W/ SIDE AIRBAGS DATA LINK CONNECTOR 3 , C11 SRS WARNING LIGHT [COMB. METER] JUNCTION CONNECTOR , A18 , A19 AIRBAG SENSOR ASSEMBLY –SL –SR LBE+ RBE+ W–B FRONT AIRBAG SENSOR FRONT AIRBAG SENSOR JUNCTION...
Page 171 SYSTEM OUTLINE The SRS is a driver and front passenger protection device which has a supplemental role to the seat belts. When the ignition SW is turned to ACC or ON, current from the SRS ACC fuse flows to TERMINAL (B) 6 of the airbag sensor assembly.
Page 172 MEMO 2003 PRIUS (EWD493U)
Page 173 FROM POWER SOURCE SYSTEM ( SEE PAGE 50 ) ABS NO. 3 ABS NO. 2 ABS NO. 1 B–W IGNITION SW L–O Y–B Y–B B–L , F13 FUSIBLE LINK LG–R BLOCK NO. 1 Y–G FUSIBLE LINK BLOCK NO. 2 120A MAIN G–W BATTERY...
Page 174 , B 2 B 3 C BRAKE ACTUATOR B–W L–O Y–B SFRH SFRR SFLH SFLR SRRH SRRR SMC1 SMC2 SLA+ SLA– , B11 , B12 , B13 BRAKE ECU GND1 GND2 MT– B–L LG–R Y–G , H 6 HYDRAULIC BOOSTER G–W W–B W–B...
Page 175 , B 2 , B 3 BRAKE ACTUATOR 16 D 10 A 23 A 16 C 24 C 27 C SLR+ SLR– VREG PREG EREG , B11 , B12 , B13 BRAKE ECU GND3 GND4 FL– FR– RL– 14 A 19 B ABS SPEED SENSOR ABS SPEED SENSOR...
Page 176 FROM POWER SOURCE SYSTEM ( SEE PAGE 50 ) , B 2 , B 3 BRAKE ACTUATOR ABS NO. 4 ECU–IG B–Y , J15 JUNCTION CONNECTOR B–Y 20 D , B11 , B12 , B13 BRAKE ECU RR– HVI+ HVI– HVO+ HVO–...
Page 177 FROM POWER SOURCE SYSTEM ( SEE PAGE 50 ) STOP GAUGE GR–L MPX1 STOP LIGHT SW MPX2 J14 A JUNCTION MPX– CONNECTOR MPX+ , B11 , B12 , B13 BRAKE ECU 22 A JUNCTION CONNECTOR , C11 COMBINATION METER MPX+ MPD2 MP2+ MPD1...
Page 178 SYSTEM OUTLINE 1. INPUT SIGNALS (1) Speed sensor signal The speed of the wheels is detected and input to TERMINALS FL+, FR+, RL+ and RR+ of the brake ECU. (2) Stop light SW signal A signal is input to TERMINAL STP of the brake ECU when the brake pedal is depressed. 2.
Page 179 : JUNCTION BLOCK AND WIRE HARNESS CONNECTOR Code See Page Junction Block and Wire Harness (Connector Location) Engine Room Main Wire and Engine Room J/B (Engine Compartment Left) Instrument Panel Wire and Instrument Panel J/B (Cowl Side Panel LH) Engine Room Main Wire and Instrument Panel J/B (Cowl Side Panel LH) Cowl Wire and Instrument Panel J/B (Cowl Side Panel LH) Cowl Wire and Instrument Panel J/B (Cowl Side Panel LH) : CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS...
Page 180 MEMO 2003 PRIUS (EWD493U)
Page 181: Rear Window Defogger
REAR WINDOW DEFOGGER FROM POWER SOURCE SYSTEM ( SEE PAGE 50 ) GAUGE RELAY B 8 A BODY MPX+ MPX+ COMBINATION METER MPX– REAR WINDOW DEFOGGER SW RDEF A/C AMPLIFIER NOISE FILTER ( REAR WINDOW DEFOGGER ) 2003 PRIUS (EWD493U)
Page 182 SERVICE HINTS DEF RELAY 5–3 : Closed with the ignition SW on and the rear window defogger SW on : PARTS LOCATION Code See Page Code See Page Code See Page : JUNCTION BLOCK AND WIRE HARNESS CONNECTOR Code See Page Junction Block and Wire Harness (Connector Location) Floor Wire and Instrument Panel J/B (Cowl Side Panel LH) 2003 PRIUS (EWD493U)
Page 183: Combination Meter
COMBINATION METER FROM POWER SOURCE SYSTEM ( SEE PAGE 50 ) , B 9 BODY ECU 7. 5A FU– MPX– MPX+ ECU–B GAUGE DOME FUEL SENDER MPX2 J27 A SENSOR JUNCTION CONNECTOR MPX1 GR–L , C11 COMBINATION METER ODO/TRIP SW [HAZARD WARNING SW] 2003 PRIUS (EWD493U)
Page 184 V–W FROM HYBRID VEHICLE CONTROL ECU V–W FROM ENGINE CONTROL MODULE MPD2 , J28 JUNCTION CONNECTOR MPD1 FROM MULTI DISPLAY V–W FROM NAVIGATION ECU MP2+ MPX+ GR–L COMBINATION METER BUZZER 2003 PRIUS (EWD493U)
Page 185 COMBINATION METER FROM POWER SOURCE SYSTEM ( SEE PAGE 50 ) * 1 : W/O DAYTIME RUNNING LIGHT * 2 : W/ DAYTIME RUNNING LIGHT GR–R , J28 JUNCTION CONNECTOR GR–R , C11 COMBINATION METER 2003 PRIUS (EWD493U)
Page 186 SERVICE HINTS C10 (A), C11 (B) COMBINATION METER (A)22–GROUND : Approx. 12 volts with the ignition SW at ON position (B) 5–GROUND : Approx. 12 volts with the ignition SW at ON or ACC position (A)21–GROUND : Always approx. 12 volts (A)14–GROUND : Always continuity : PARTS LOCATION Code...
Page 187: Radiator Fan And Condenser Fan
RADIATOR FAN AND CONDENSER FAN FROM POWER SOURCE SYSTEM ( SEE PAGE 50 ) CDS FAN ECU–IG FAN NO. 1 FAN NO. 2 FAN NO. 3 RELAY RELAY RELAY RADIATOR FAN MOTOR W–B AMPLIFIER , J28 A/C SINGLE JUNCTION PRESSURE SW CONNECTOR WATER TEMP.
Page 188 SYSTEM OUTLINE The radiator fan motor and A/C condenser fan motor operates according to the water temp. SW (Inverter), A/C single pressure SW, and the A/C system condition. The FAN NO.1 relay, FAN NO.2 relay, FAN NO.3 relay are turned on/off, to operate the fan motors at low speed (In series), or high speed (In parallel).
Page 189: Air Conditioning
AIR CONDITIONING FROM POWER SOURCE SYSTEM ( SEE PAGE 50 ) CLR MG RELAY RELAY ( * 1 ) ( * 2 ) JUNCTION CONNECTOR ( * 1 ) ( * 2 ) L–O LG–R B–L BLOWER MOTOR L–Y BLOWER MOTOR LINEAR CONTROLLER A/C W/P RELAY...
Page 190 * 1 : W/ DAYTIME RUNNING LIGHT FROM POWER SOURCE SYSTEM ( SEE PAGE 50 ) * 2 : W/O DAYTIME RUNNING LIGHT 7. 5A ECU–B L–O L–O LG–R B–L SGTR SGTE , A 8 A/C AMPLIFIER ( *1 ) ( *2 ) LOCK SGLOCK...
Page 191 AIR CONDITIONING B 8 A BODY ECU HRLY MPX+ MPX– GR–L MPX+ MPD2 MPX1 MPX2 MPX– MPD1 MEO2 MPX+ MP2+ , A 9 A/C AMPLIFIER S5TS SGTPI S5TPI AIR INLET CONTROL SERVO MOTOR 2003 PRIUS (EWD493U)
Page 192 BSET TSET MSET PIG5 RDEF FULL A/C RDEF FULL A/C , A 9 A/C AMPLIFIER S5TP SGTP S5TPM SGTPM 13 C 11 C AIR MIX CONTROL SERVO MOTOR AIR VENT MODE CONTROL SERVO MOTOR 2003 PRIUS (EWD493U)
Page 193 AIR CONDITIONING FROM POWER SOURCE SYSTEM ( SEE PAGE 50 ) * 3 : COLD AREA SPEC. GAUGE HTR3 HTR2 HTR1 R–L R–L ( * 3 ) ( * 3 ) HTR3 HTR2 HTR1 RELAY RELAY RELAY P–B ( * 3 ) L–Y(* 3) HTR2 , P 4...
Page 194 SERVICE HINTS A3 A/C DUAL PRESSURE SW 1–4 : Open with the refrigerant pressure at less than approx. 196 kpa (2.0 kgf/cm , 28.4 psi), or more than approx. 3140 kpa (32 kgf/cm , 455 psi), A7 (A), A8 (B), A9 (C) A/C AMPLIFIER (A) 8–GROUND : Always approx.
Page 195 AIR CONDITIONING : SPLICE POINTS Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points Engine Room Main Wire 2003 PRIUS (EWD493U)
Page 196 MEMO 2003 PRIUS (EWD493U)
Page 197 I GROUND POINT W–B WATER PUMP FAN NO. 2 MOTOR (INVERTER) RELAY W–B W–B W–B W–B IGCT RELAY IG2 RELAY W–B ( –S ) HTR RELAY A/C TRIPLE PRESSURE SW W–B (CUT–) EFI RELAY W–B W–B ENGINE HOOD COURTESY SW W–B W–B HYDRAULIC BOOSTER...
Page 198: Power Window
W–B W–B HYBRID VEHICLE LIGHT CONTROL (EOM) CONTROL ECU RHEOSTAT W–B W–B KEY INTERLOCK ( KLS– ) ( CG ) GATEWAY ECU SOLENOID W–B JUNCTION * 1 : W/ DAYTIME RUNNING LIGHT CONNECTOR * 2 : W/ NAVIGATION SYSTEM , J23 JUNCTION CONNECTOR W–B W–B...
Page 199: Stop Light
I GROUND POINT W–B W–B REAR COMBINATION BATTERY MOTOR LIGHT LH BLOWER CONTROLLER W–B W–B LICENSE PLATE PERSONAL LIGHT LIGHT LH W–B HIGH MOUNTED STOP LIGHT , J33 W–B W–B W–B REAR COMBINATION POWER WINDOW JUNCTION LIGHT RH CONTROL SW REAR LH CONNECTOR W–B LICENSE PLATE...
Page 200 : PARTS LOCATION Code See Page Code See Page Code See Page : RELAY BLOCKS Code See Page Relay Blocks (Relay Block Location) Engine Room R/B No.2 (Right Side of Reserve Tank) Engine Room R/B No.3 (Engine Compartment Right) : JUNCTION BLOCK AND WIRE HARNESS CONNECTOR Code See Page Junction Block and Wire Harness (Connector Location)
Page 201 I GROUND POINT : SPLICE POINTS Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points Engine Room Main Wire Rear Door No.2 Wire Engine Wire Rear Door No.1 Wire Engine Room Main Wire 2003 PRIUS (EWD493U)
Page 202 MEMO 2003 PRIUS (EWD493U)
Page 203 J POWER SOURCE (Current Flow Chart) 2003 PRIUS (EWD493U)
Page 204 2003 PRIUS (EWD493U)
Page 205: Taillight
System Page Illumination Key Reminder and Light Reminder Buzzer 100A DC/DC Light Auto Turn Off Taillight TOYOTA Hybrid System Fusible Link Block No.2 (See Page 23) Fuse System Page DC/DC–S TOYOTA Hybrid System Engine Control Headlight (w/o Daytime Running Light)
Page 206 Fuse System Page Engine Control Hybrid Vehicle Immobiliser System TOYOTA Hybrid System Combination Meter Door Lock Control Headlight (w/ Daytime Running Light) Headlight (w/o Daytime Running Light) Illumination Interior Light Key Reminder and Light Reminder Buzzer DOME Navigation System Power Window...
Page 207 Navigation System Power Window Rear Window Defogger Seat Belt Warning Theft Deterrent TOYOTA Hybrid System Turn Signal and Hazard Warning Light Wireless Door Lock Control Air Conditioning SRS ACC ∗ These are the page numbers of the first page on which the related system is shown.
Page 208: Wiper And Washer
Fuse System Page Cigarette Lighter Engine Control STOP Shift Lock Stop Light WASHER Wiper and Washer PWR1 Power Window Door Lock Control DOOR Theft Deterrent Wireless Door Lock Control POWER Power Window WIPER Wiper and Washer Rear Window Defogger ∗ These are the page numbers of the first page on which the related system is shown. 2003 PRIUS (EWD493U)
Page 209 K CONNECTOR LIST BLACK GRAY BLACK GRAY GRAY BLACK 6 7 8 9 1011 1516 202122 BLACK BLACK 1 2 3 3 4 5 4 5 6 YELLOW YELLOW YELLOW YELLOW 1 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 5 6 7 8 9 1011121314151617 7 8 9 101112...
Page 210 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 3 4 5 6 7 8 9 11 1213141516171819 20 10 11 12 13 14 15 16 17 18 BLACK BLACK BLACK 3 4 5 6 7 3 4 5 6...
Page 211 K CONNECTOR LIST GRAY 1 2 3 4 5 6 9 10 1112131415 16 17 BLACK BLACK 1 2 3 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 BLACK BLACK...
Page 212 BLACK BLACK BLACK YELLOW 3 4 5 6 7 3 4 5 6 1 2 3 4 5 12 13 14 15 16 17 8 9 10 11 12 13 14 25 26 16 17 20 21 YELLOW GRAY GRAY BLACK BLACK GRAY...
Page 213 K CONNECTOR LIST BLACK BLACK 1 2 3 4 5 6 3 4 5 6 7 1 2 3 4 5 3 4 5 6 7 8 9 10 11 12 8 9 10 11 12 13 14 12 13 14 15 16 17 13 14 15 16 17...
Page 214 (w/ Daytime Running Light) (w/o Daytime Running Light) BLUE A A B A A A A A A A A A B B C C A A B B B A A B B B B C C D D E E F F GRAY GRAY BLACK...
Page 215 K CONNECTOR LIST BLUE BLACK BLACK BLACK A A A A A A B B C C A A B B C C D D D E E E D D D E E E GRAY GRAY DARK GRAY GRAY A A A A A A A A A A A A 3 4 5 6...
Page 216 BLUE BLACK 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 YELLOW YELLOW BLACK 3 4 5 6 5 6 7 8 9 10 6 7 8 9 101112 1 2 3 4 5 6 7 8 9 10 GRAY YELLOW...
Page 217 K CONNECTOR LIST BLACK BLUE BROWN BLACK BLACK 1 2 3 1 2 3 BLUE BLACK BLACK GRAY DARK GRAY 1 2 3 2003 PRIUS (EWD493U)
Page 218 MEMO 2003 PRIUS (EWD493U)
Page 219 L PART NUMBER OF CONNECTORS Code Part Name Part Number Code Part Name Part Number A/C Condenser Fan Motor 90980–11237 Buckle SW and Tension Reducer LH 90980–11471 A/C Magnetic Clutch and Lock Sensor 90980–10942 Buckle SW RH and Seat Belt Warning Occupant Detection Sensor A/C Triple Pressure SW (A/C Dual and 90980–10943...
Page 220 Code Part Name Part Number Code Part Name Part Number Engine Control Module 90980–11638 Inverter 90980–10891 Front Airbag Sensor LH Inverter 90980–10988 90980–11856 90980–11856 Front Airbag Sensor RH Inverter 90980–10897 Front Parking Light LH Inverter 90980–11943 Front Parking Light RH Inverter 90980–11944 90980–11162...
Page 221 L PART NUMBER OF CONNECTORS Code Part Name Part Number Code Part Name Part Number License Plate Light LH Side Airbag Sensor LH 90980–11148 90980–11148 90980–11857 90980–11857 License Plate Light RH Side Airbag Sensor RH Luggage Compartment Door Unlock SW 90980–11212 Side Airbag Squib LH 90980–11864...
Page 222 Code Part Name Part Number Code Part Name Part Number 2003 PRIUS (EWD493U)
Page 223 M OVERALL ELECTRICAL WIRING DIAGRAM 2003 PRIUS (EWD493U)
Page 224 [A] : System Title [F] : Junction Block (The number in the circle is the J/B No. and the connector code is shown beside [B] : Indicates the wiring color. it). Junction Blocks are shaded to clearly Wire colors are indicated by an alphabetical code. separate them from other parts.
Page 225 2–16 TOYOTA Hybrid System ........
Page 226 2003 PRIUS (EWD493U)
Page 227 ( Cont. next page ) 1 PRIUS ELECTRICAL WIRING DIAGRAM P ow e r S ou rc e T O Y O T A H y brid S y s te m B–R B–R G–Y G–Y L–R L–R W–G L–Y B–Y B–W W–B...
Page 228 M OVERALL ELECTRICAL WIRING DIAGRAM 2003 PRIUS (EWD493U)
Page 229 1 PRIUS ( Cont’ d ) ( Cont. next page ) T O Y O T A H y b rid S y s tem * 1 : Shielded B–R G–Y G–Y L–R L–R , H13 , H14 HYBRID VEHICLE CONTROL ECU IGSW ST1–...
Page 230 2003 PRIUS (EWD493U)
Page 231 1 PRIUS ( Cont’ d ) ( Cont. next page ) T O Y O T A H y b rid S y s tem * 1 : Shielded G–Y G–Y L–R L–R , H12 , H13 , H14 HYBRID VEHICLE CONTROL ECU ETH+ ETH–...
Page 232 M OVERALL ELECTRICAL WIRING DIAGRAM 2003 PRIUS (EWD493U)
Page 233 1 PRIUS ( Cont’ d ) ( Cont. next page ) T O Y O T A H y b rid S y s tem * 1 : Shielded * 2 : High Voltage(273. 6V) G–Y G–Y L–R L–R , H12 , H13 , H14 HYBRID VEHICLE CONTROL ECU...
Page 234 2003 PRIUS (EWD493U)
Page 235 1 PRIUS ( Cont’ d ) ( Cont. next page ) T O Y O T A H y b rid S y s tem * 1 : Shielded * 2 : High Voltage(273. 6V) G–Y G–Y L–R L–R , H12 , H13 , H14 HYBRID VEHICLE CONTROL ECU...
Page 236 M OVERALL ELECTRICAL WIRING DIAGRAM 2003 PRIUS (EWD493U)
Page 237 1 PRIUS ( Cont’ d ) T O Y O T A H yb rid S y s tem * 2 : High Voltage ( 273. 6V ) G–Y L–R , H12 , H13 , H14 HYBRID VEHICLE CONTROL ECU BATT MREL 7 IH1...
Page 238 MEMO 2003 PRIUS (EWD493U)
Page 239 M OVERALL ELECTRICAL WIRING DIAGRAM 2003 PRIUS (EWD493U)
Page 240 2 PRIUS ( Cont. next page ) P ow er S ou rc e E n gine C on tro l R–G W–L W–L JUNCTION CONNECTOR B–W B–W B–W 7 AM2 W–R G–R B–W B–W IGNITION SW MPX– MPX+ THRO 4 IA2 14 IA1 22 A...
Page 241 2003 PRIUS (EWD493U)
Page 242 2 PRIUS ( Cont’ d ) ( Cont. next page ) E n gine C on trol * 1 : Shielded R–G R–G W–L B–R B–W B–W B–W B–W B–W B–W B–W B–W W–B W–B W–B W–B G–R P–B 1 ID1 2 ID1 E P–B P–B...
Page 243 M OVERALL ELECTRICAL WIRING DIAGRAM 2003 PRIUS (EWD493U)
Page 244 2 PRIUS ( Cont’ d ) ( Cont. next page ) E n gine C on trol * 1 : Shielded R–G R–G B–R B–R B–W B–W B–W B–W B–W B–W B–W THROTTLE CONTROL MOTOR 1 BC1 5 BC1 B–R VSV ( Parge Flow 2 BC1 6 BC1...
Page 245 2003 PRIUS (EWD493U)
Page 246 2 PRIUS ( Cont’ d ) E n gin e C o ntro l H y b rid V eh ic le Im m ob ilis er S y s te m R–G R–G * 1 : Shielded B–R B–W 11 ID2 10 ID2 8 ID1...
Page 247 M OVERALL ELECTRICAL WIRING DIAGRAM 2003 PRIUS (EWD493U)
Page 248 3 PRIUS H ea dligh t ( w /o D a y tim e R u nn in g L ig ht ) P o w er S o u rce S top L ig h t R–B STOP LIGHT SHORT HEAD SHORT...
Page 249 2003 PRIUS (EWD493U)
Page 250 4 PRIUS H e ad lig h t ( w / D a ytim e R u nn in g L ig ht ) P o w e r S o urc e W–G B–Y IGNITION SW 8 ID1 HEAD SHORT RELAY 7.
Page 251 M OVERALL ELECTRICAL WIRING DIAGRAM 2003 PRIUS (EWD493U)
Page 252 5 PRIUS P o w er S o u rce T u rn S ig na l a nd H a za rd W arn in g L ig ht W–B TURN SIGNAL INDICATOR LIGHT [COMB. METER] R–L IGNITION SW 6 IA1 4 ID1 TURN SIGNAL FLASHER RELAY...
Page 253 2003 PRIUS (EWD493U)
Page 254 6 PRIUS P ow e r S ou rc e B a c k– U p L igh t R–B R–B W–G 5 IJ1 R–L IGNITION SW BACK–UP LIGHT RELAY 9 IF1 RELAY 14 A HYBRID VEHICLE CONTROL ECU HTE+ HTE–...
Page 255 M OVERALL ELECTRICAL WIRING DIAGRAM 2003 PRIUS (EWD493U)
Page 256 7 PRIUS P o w er S o u rce T a illigh t TAIL 7. 5A RELAY TAIL JUNCTION CONNECTOR 2 ID2 10 IA1 TRLY BODY JUNCTION CONNECTOR FUSIBLE LINK BLOCK NO. 1 6 ID2 W–B W–B TAIL FUSIBLE LINK HEAD BLOCK NO.
Page 257 2003 PRIUS (EWD493U)
Page 258 8 PRIUS P o w er S o u rce Illu m in ation TAIL RELAY PANEL JUNCTION CONNECTOR 21 A COMBINATION METER 10 B 14 A LG–R FUSIBLE LINK BLOCK NO. 1 A W–L W–B JUNCTION CONNECTOR FUSIBLE LINK BLOCK NO.
Page 259 M OVERALL ELECTRICAL WIRING DIAGRAM 2003 PRIUS (EWD493U)
Page 260 9 PRIUS K e y R em in d er an d P o w er S o u rce L igh t A u to T u rn O ff S ea t B e lt W arn ing L igh t R em ind er B uz z er W–G R–G...
Page 261 2003 PRIUS (EWD493U)
Page 262 10 PRIUS P ow er S ou rc e In ter io r L ig h t GR–B GR–B DOME R–G MPD1 MPD2 IGNITION SW MP2+ MPX+ MPX1 MPX2 22 A 21 A RELAY 15 A 16 A MPX+ MPX– BODY ECU PCTY DCTY...
Page 263 M OVERALL ELECTRICAL WIRING DIAGRAM 2003 PRIUS (EWD493U)
Page 264 11 PRIUS P o w er S o u rce R em o te C o ntro l M irror C ig ar ette L ig hte r P–L W–G JUNCTION CONNECTOR IGNITION SW REMOTE CONTROL MIRROR SW RELAY FUSIBLE LINK BLOCK NO.
Page 265 2003 PRIUS (EWD493U)
Page 266 12 PRIUS P o w e r S o urc e H o rn W ipe r a nd W a sh e r FRONT WIPER AND WASHER SW[COMB. SW] 10 IH1 INT1 INT2 W–G B–Y IGNITION SW WASHER MOTOR WASHER WIPER RELAY 2 IA1...
Page 267 M OVERALL ELECTRICAL WIRING DIAGRAM 2003 PRIUS (EWD493U)
Page 268 13 PRIUS P o w er S o u rce S h ift L o c k E lec tric T e ns io n R ed uc e r P–L 12 IJ1 W–G B–Y JUNCTION CONNECTOR IGNITION SW JUNCTION CONNECTOR 5 ID1 RELAY...
Page 269 MEMO 2003 PRIUS (EWD493U)
Page 270 M OVERALL ELECTRICAL WIRING DIAGRAM 2003 PRIUS (EWD493U)
Page 271 ( Cont. next page ) 14 PRIUS P ow e r S ou rc e R ad io a n d P la y er * 1 : w/o Navigation System * 2 : w/ Navigation System R–G B–Y L–Y L–Y P–L GR–R...
Page 272 2003 PRIUS (EWD493U)
Page 273 14 PRIUS ( Cont’ d ) N av iga tio n S y s te m G ate w a y S y ste m * 2 : w/ Navigation System R–G B–Y L–Y L–Y MULTI DISPLAY GR–R GR–R TX– TX1+ TX1–...
Page 274 M OVERALL ELECTRICAL WIRING DIAGRAM 2003 PRIUS (EWD493U)
Page 275 ( Cont. next page ) 15 PRIUS P ow e r S o urc e D oo r L o ck C o ntro l JUNCTION CONNECTOR B–Y IGNITION SW BODY ECU RCTY PCTY DCTY ACTD 12 A L–Y 5 IG1 RELAY POWER WINDOW MASTER SW...
Page 276 2003 PRIUS (EWD493U)
Page 277 15 PRIUS ( Cont’ d ) D o or L oc k C on tro l BODY ECU LSWP ACT+ ACT– 16 B 17 A 18 A 14 B 15 B JUNCTION 2 IF1 CONNECTOR 12 ID2 1 IF1 11 IN1 12 IN1 2 IN1 2 BB1...
Page 278 M OVERALL ELECTRICAL WIRING DIAGRAM 2003 PRIUS (EWD493U)
Page 279 ( Cont. next page ) 16 PRIUS P o w e r S o urc e W ireles s D oo r L o c k C o ntro l B–Y BODY ECU IGNITION SW RCTY PCTY DCTY 12 A L–Y 2 IF1 RELAY...
Page 280 2003 PRIUS (EWD493U)
Page 281 16 PRIUS ( Cont’ d ) W ire le ss D o or L oc k C on trol BODY ECU ACTD LSWP ACT+ ACT– 10 B 16 B 17 A 18 A 14 B 15 B 5 IG1 JUNCTION CONNECTOR POWER WINDOW MASTER SW...
Page 282 M OVERALL ELECTRICAL WIRING DIAGRAM 2003 PRIUS (EWD493U)
Page 283 17 PRIUS P ow e r S o urc e T h eft D e ter ren t From HORN Relay<12–1> See Door Lock Control System <15–4><15–5><15–6><15–7><15–8> B–Y JUNCTION CONNECTOR 4 ID2 IGNITION SW 11 A 10 A 18 A 14 B 15 B 16 B...
Page 284 2003 PRIUS (EWD493U)
Page 285 18 PRIUS P ow e r S o urc e P ow e r W in do w BODY ECU DCTY W–G JUNCTION CONNECTOR R–G R–G IGNITION SW L–Y L–W DOME RELAY 7 IB1 L–W 3 IQ1 7 IN1 5 IN1 5 BB1 4 BB1 5 BA1...
Page 286 M OVERALL ELECTRICAL WIRING DIAGRAM 2003 PRIUS (EWD493U)
Page 287 ( Cont. next page ) 19 PRIUS P ow er S ou rc e A B S B–Y B–W B–W V–R 2 IP1 1 IP1 GR–B 2 2I 7 AM2 22 A 10 A Y–B IGNITION SW L–O Y–B RELAY 14 IA2 W–R 14 A...
Page 288 2003 PRIUS (EWD493U)
Page 289 19 PRIUS ( Cont’ d ) ( Cont. next page ) A B S B–Y B–Y B–W B–W 10 C 12 C 11 C V–R BRAKE ACTUATOR BODY ECU MPX+ MPX– 15 A 16 A GR–B MPX2 18 B 22 D 21 A 16 D SFRH...
Page 290 M OVERALL ELECTRICAL WIRING DIAGRAM 2003 PRIUS (EWD493U)
Page 291 19 PRIUS ( Cont’ d ) A B S B–Y B–Y BRAKE ACTUATOR JUNCTION CONNECTOR 12 A 11 A 10 A 13 IA2 10 A 22 A 23 A 12 A 16 C 25 C 24 C 15 C 28 C 27 C 18 C 13 D...
Page 292 2003 PRIUS (EWD493U)
Page 293 20 PRIUS P ow er S ou rc e E M P S W–G EMPS R–G IGNITION SW EMPS RELAY RELAY 7 IA2 1 IM1 3 IP1 EMPS ECU PGND TRQV TRQ1 TRQ2 TRQG FUSIBLE LINK BLOCK NO. 1 10 D W–B W–B FUSIBLE LINK...
Page 294 M OVERALL ELECTRICAL WIRING DIAGRAM 2003 PRIUS (EWD493U)
Page 295 21 PRIUS P ow e r S o urc e S R S * 1 : w/ Side Airbags P–L W–G GR–R GR–R JUNCTION JUNCTION CONNECTOR CONNECTOR 16 A 7 AM2 W–R SRS WARNING LIGHT [COMB. METER] To Data Link Connector 3 IGNITION SW <2–5><2–6>...
Page 296 2003 PRIUS (EWD493U)
Page 297 22 PRIUS P o w er S o u rce R ea r W ind ow D efo gg e r R a diato r F an a nd C on d en se r F an B–Y GR–B 15 A MPX+ IGNITION SW 1 2H...
Page 298 M OVERALL ELECTRICAL WIRING DIAGRAM 2003 PRIUS (EWD493U)
Page 299 ( Cont. next page ) 23 PRIUS P ow er S ou rc e C o m bina tio n M ete r R–G R–G GR–L 16 A MPX– MPX2 MPX1 MPD2 From Multi V–W Display <14–7> FU– MPX+ MPD1 From Hybrid V–W 15 A...
Page 300 2003 PRIUS (EWD493U)
Page 301 23 PRIUS ( Cont’ d ) C o m bina tio n M ete r 19 A 18 A 17 A 10 A 16 A COMBINATION METER...
Page 302 M OVERALL ELECTRICAL WIRING DIAGRAM 2003 PRIUS (EWD493U)
Page 303 ( Cont. next page ) 24 PRIUS * 1 : w/ Daytime Running Light P o w e r S o urc e A ir C on ditio ning * 2 : w/o Daytime Running Light * 3 : Cold Area Spec. B–R(*3) G–W(*3) R–L...
Page 304 2003 PRIUS (EWD493U)
Page 305 24 PRIUS ( Cont’ d ) ( Cont. next page ) A ir C on ditio ning * 3 : Cold Area Spec. B–R(*3) B–R(*3) G–W(*3) G–W(*3) R–L R–L BODY ECU HRLY MPX+ MPX– 15 A 16 A W–G W–G GR–L L–O 14 D...
Page 306 M OVERALL ELECTRICAL WIRING DIAGRAM 2003 PRIUS (EWD493U)
Page 307 24 PRIUS ( Cont’ d ) A ir C o nd ition in g * 3 : Cold Area Spec. B–R(*3) G–W(*3) R–L R–L R–L ( *3 ) ( *3 ) HTR3 HTR2 HTR1 RELAY RELAY RELAY BSET TSET MSET PIG5 RDEF FULL...

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