Toyota Scion tC 2005 Wiring Diagram
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Toyota Scion tC 2005 Wiring Diagram

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NOTICE
When handling supplemental restraint system components (removal,
installation or inspection, etc.), always follow the direction given in the repair
manuals listed above to prevent accidents and supplemental restraint
system malfunction.
FOREWORD
This wiring diagram manual has been prepared to provide
information on the electrical system of the 2005 tC.
Applicable models: ANT10 Series
For service specifications and repair procedures of the above
models other than those listed in this manual, refer to the
following manuals;
Manual Name
D 2005 SCION tC Repair Manual
D 2005 SCION tC New Car Features
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.
Pub. No.
Volume 1
RM1104U1
Volume 2
RM1104U2
NCF264U

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Summary of Contents for Toyota Scion tC 2005

  • Page 1 FOREWORD This wiring diagram manual has been prepared to provide information on the electrical system of the 2005 tC. Applicable models: ANT10 Series For service specifications and repair procedures of the above models other than those listed in this manual, refer to the following manuals;...
  • Page 2 ..OVERALL ELECTRICAL WIRING DIAGRAM ..E2004 All rights reserved. This book may not be reproduced or copied, in whole or in part, without the written permission of Toyota Motor Corporation. 2005 SCION tC (EWD572U)
  • 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 Stop Light SW Combination Meter...
  • Page 6 [A] : System Title [H] : 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 [N] : Explains the system outline. [O] : Indicates values or explains the function for reference during troubleshooting. [P] : 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: Connector List

    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 Door Key Lock and Unlock SW RH [A] : Part Code [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. 2005 SCION tC (EWD572U)
  • 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 Sequential Multiport Fuel Injection Supplemental Restraint System Switch TEMP. Temperature TVIP TOYOTA Vehicle Intrusion Protection Vacuum Switching Valve With Without ∗ The titles given inside the components are the names of the terminals (terminal codes) and are not treated as being abbreviations.
  • 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: Engine Compartment

    F RELAY LOCATIONS [Engine Compartment] [Body] 2005 SCION tC (EWD572U)

  • Page 22: Instrument Panel

    [Instrument Panel] 2005 SCION tC (EWD572U)
  • Page 23 F RELAY LOCATIONS : Engine Room R/B Engine Compartment Left (See Page 20) Engine Compartment Left (See Page 20) : Engine Room J/B 2005 SCION tC (EWD572U)
  • Page 24 : Engine Room R/B No.2 Inside of the Engine Room R/B Box (See Page 20) 2005 SCION tC (EWD572U)
  • Page 25 F RELAY LOCATIONS : Instrument Panel J/B Lower Finish Panel (See Page 21) 2005 SCION tC (EWD572U)
  • Page 26 2005 SCION tC (EWD572U)
  • Page 27 F RELAY LOCATIONS : Instrument Panel J/B Lower Finish Panel (See Page 21) 2005 SCION tC (EWD572U)
  • Page 28 Memo 2005 SCION tC (EWD572U)
  • Page 29 F RELAY LOCATIONS [Instrument Panel J/B Inner Circuit] 2005 SCION tC (EWD572U)
  • Page 30 2005 SCION tC (EWD572U)
  • Page 31 F RELAY LOCATIONS [Instrument Panel J/B Inner Circuit] 2005 SCION tC (EWD572U)
  • Page 32 2005 SCION tC (EWD572U)
  • Page 33 G ELECTRICAL WIRING ROUTING Position of Parts in Engine Compartment A 1 A/C Compressor F 1 Fuel Injector (No.1) A 2 A/C Condenser Fan Motor F 2 Fuel Injector (No.2) A 3 Air Fuel Ratio Sensor (Bank 1 Sensor 1) F 3 Fuel Injector (No.3) A 4 Airbag Sensor (Front LH) F 4 Fuel Injector (No.4)
  • Page 34 Position of Parts in Engine Compartment 1 Ignition Coil (No.1) S 1 Skid Control ECU with Actuator 2 Ignition Coil (No.2) S 2 Speed Sensor (Front LH) 3 Ignition Coil (No.3) S 3 Speed Sensor (Front RH) 4 Ignition Coil (No.4) S 4 Starter S 5 Starter K 1 Knock Control Sensor (Bank 1)
  • Page 35 G ELECTRICAL WIRING ROUTING Position of Parts in Instrument Panel A 7 A/C Control Assembly D 1 Damper Servo Motor (Air Inlet) A 8 A/C Thermistor No.1 D 2 Damper Servo Motor (Air Mix) A 9 A/T Shift Lever Illumination D 3 Damper Servo Motor (Air Vent Mode) A 10 Accelerator Position Sensor D 4 Data Link Connector 3...
  • Page 36 Position of Parts in Instrument Panel 5 Ignition SW P 6 Parking Brake SW 6 Integration Relay P 7 Power Point Socket P 8 Power Point Socket Relay J 1 Junction Connector J 2 Junction Connector R 2 Radio Receiver Assembly J 3 Junction Connector R 3 Radio Receiver Assembly J 4 Junction Connector...
  • Page 37 G ELECTRICAL WIRING ROUTING Position of Parts in Body A 18 Airbag Sensor (Rear LH) F 6 Front Seat Inner Belt (Driver’s Side) A 19 Airbag Sensor (Rear RH) F 7 Front Seat Inner Belt (Driver’s Side) F 8 Front Seat Inner Belt (Front Passenger’s Side) B 5 Back Door Lock Assembly F 9 Fuel Suction Pump and Gage Assembly B 6 Back Door Opener SW...
  • Page 38 Position of Parts in Body O 2 Outer Rear View Mirror (LH) S 9 Side Airbag Sensor (LH) O 3 Outer Rear View Mirror (RH) S 10 Side Airbag Sensor (RH) S 11 Side Airbag Squib (LH) P 9 Power Window Master SW S 12 Side Airbag Squib (RH) P 10 Power Window Regulator Motor (Front LH) S 13 Sliding Roof Control ECU...
  • Page 39 G ELECTRICAL WIRING ROUTING : Location of Connector Joining Wire Harness and Wire Harness : Location of Ground Points : Location of Splice Points 2005 SCION tC (EWD572U)
  • Page 40 Connector Joining Wire Harness and Wire Harness Code Joining Wire Harness and Wire Harness (Connector Location) Engine Wire and Engine Room Main Wire (Inside of the Engine Room R/B Box) 2005 SCION tC (EWD572U)
  • Page 41 G ELECTRICAL WIRING ROUTING : Location of Connector Joining Wire Harness and Wire Harness : Location of Ground Points 2005 SCION tC (EWD572U)
  • Page 42 Connector Joining Wire Harness and Wire Harness Code Joining Wire Harness and Wire Harness (Connector Location) Roof Wire and Instrument Panel Wire (Cowl Top Side Panel LH) Front Door LH Wire and Instrument Panel Wire (Left Kick Panel) Front Door LH Wire and Instrument Panel Wire (Left Kick Panel) Floor Wire and Instrument Panel Wire (Left Kick Panel) Floor Wire and Instrument Panel Wire (Left Kick Panel) Front Door LH Wire and Floor Wire (Left Kick Panel)
  • Page 43 G ELECTRICAL WIRING ROUTING : Location of Connector Joining Wire Harness and Wire Harness : Location of Splice Points 2005 SCION tC (EWD572U)
  • Page 44 Connector Joining Wire Harness and Wire Harness Code Joining Wire Harness and Wire Harness (Connector Location) Instrument Panel Wire and Switch Wire (Instrument Panel Brace LH) Instrument Panel Wire and Instrument Panel Wire Assembly (Behind of the Glove Box) Engine Wire and Instrument Panel Wire (Cowl Side Panel RH) Engine Wire and Instrument Panel Wire (Cowl Side Panel RH) Front Door RH Wire and Instrument Panel Wire (Right Kick Panel) Front Door RH Wire and Instrument Panel Wire (Right Kick Panel)
  • Page 45 G ELECTRICAL WIRING ROUTING : Location of Connector Joining Wire Harness and Wire Harness : Location of Ground Points : Location of Splice Points 2005 SCION tC (EWD572U)
  • Page 46 Connector Joining Wire Harness and Wire Harness Black Gray 4 3 2 1 1 2 3 4 8 7 6 5 5 6 7 8 Code Joining Wire Harness and Wire Harness (Connector Location) Back Door Wire and Floor Wire (Back Window Upper Frame LH) Back Door Wire and Floor Wire (Back Window Upper Frame LH) Floor Wire and Floor No.3 Wire (Center Floor Pan Center) 2005 SCION tC (EWD572U)
  • Page 47 Memo 2005 SCION tC (EWD572U)

  • Page 48: Table Of Contents

    SYSTEM CIRCUITS H 2005 tC ELECTRICAL WIRING DIAGRAM SYSTEM CIRCUITS Page ABS ..............Air Conditioning .
  • Page 49 I GROUND POINT W–B W–B Leak Detection Pump Assembly Junction Connector Data Link ( SG ) ( E01 ) Connector 3 Engine Control Module Combination Meter (E02) J 4 ( A ) , J 5 ( B ) Junction Connector Ignition Coil (No.
  • Page 50 Noise Filter Integration Relay IG1 Relay HTR Relay FLASH Relay W–B W–B Combination SW Map Lamp W–B W–B ( EL ) ( E ) W–B W–B W–B W–B Sliding Roof ( E1 ) Control ECU Airbag Sensor Assembly Center W–B (E2) Room Lamp (Center) W–B...
  • Page 51 I GROUND POINT W–B W–B Rear Combination (ACT–) Lamp (LH) Back Door Lock Assembly W–B ( E ) W–B W–B W–B Rear Combination License Plate Lamp Lamp (RH) (RH) W–B J11 ( A ) , J12 ( B ) W–B Junction Back Door Opener SW Connector...
  • Page 52 : 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 (Engine Compartment Left) Engine Room R/B No.2 (Inside of the Engine Room R/B Box) : Junction Block and Wire Harness Connector Code See Page...
  • Page 53 J POWER SOURCE (Current Flow Chart) 2005 SCION tC (EWD572U)
  • Page 54 2005 SCION tC (EWD572U)
  • Page 55 J POWER SOURCE (Current Flow Chart) Instrument Panel J/B (See Page 24) Fuse System Page Audio System Power Outlet 7.5A Remote Control Mirror Shift Lock ABS and Tire Pressure Warning System Air Conditioning Back Door Opener Charging Cruise Control Door Lock Control 7.5A ECU–IG Interior Light...
  • Page 56 Fuse System Page Seat Belt Warning MET IG2 Sliding Roof ABS and Tire Pressure Warning System Cruise Control Electronically Controlled Transmission and A/T Indicator STOP Engine Control Shift Lock Stop Light Engine Control TAIL Taillight ACC SOCKET Power Outlet Cigarette Lighter FR WSH Front Wiper and Washer Cruise Control...
  • Page 57 J POWER SOURCE (Current Flow Chart) Fuse System Page Electronically Controlled Transmission and A/T Indicator Engine Control Engine Immobilizer System Illumination Interior Light ECU–B Key Reminder Light Reminder Power Window Seat Belt Warning Sliding Roof Wireless Door Lock Control Cruise Control ETCS Electronically Controlled Transmission and A/T Indicator Engine Control...
  • Page 58 Fuse System Page Taillight 120A Wireless Door Lock Control Engine Room R/B No.2 (See Page 23) Fuse System Page Electronically Controlled Transmission and A/T Indicator 7.5A Engine Control Starting ∗ These are the page numbers of the first page on which the related system is shown. 2005 SCION tC (EWD572U)
  • Page 59 K CONNECTOR LIST Gray Black Dark Gray Yellow Yellow Black Black 1 2 3 4 5 6 Yellow Yellow Yellow 1 2 3 4 5 6 7 8 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 10 11 12 13 14 15 16 13 14 15 16 17 18 19 10 11 12 13 14 15 16...
  • Page 60 9 10 1112131415 16 17 Black Black Black 1 2 3 1 2 3 4 5 6 7 8 9 10 11 12 131415 16 17 18 Black Black 1 2 3 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 Black Black...
  • Page 61 K CONNECTOR LIST 13 14 15 16 9 10 13 14 15 13 14 15 16 22 23 21 22 23 24 22 23 24 25 Brown Brown 15 16 17 18 13 14 15 16 24 25 22 23 24 25 30 31 32 Brown...
  • Page 62 Black Black Black 1 2 3 4 1 2 3 4 1 2 3 4 4 5 6 7 8 9 15 16 18 19 20 21 22 23 24 25 26 A B B A A B D D D C C Dark Gray Black Dark Gray...
  • Page 63 K CONNECTOR LIST Gray 1 2 3 4 5 6 7 8 9 10 Gray Gray Gray Black Dark Gray 11 12 Black Black Yellow Yellow 1 2 3 4 5 6 3 4 5 6 3 4 5 6 7 8 9 10 11 12 Gray Black...
  • Page 64 Gray Black 4 5 6 10 11 12 17 18 19 26 27 28 32 33 34 Gray Gray Black 4 5 6 Black Yellow Yellow Yellow 4 5 6 Yellow 6 7 8 9 10 Black Black Black Gray 1 2 3 4 5 6 Gray Blue...
  • Page 65 K CONNECTOR LIST (A/T) (M/T) Blue 1 2 3 4 1 2 3 4 Black Black Gray 1 2 3 3 4 5 6 7 2005 SCION tC (EWD572U)
  • Page 66 Memo 2005 SCION tC (EWD572U)
  • Page 67 L PART NUMBER OF CONNECTORS Code Part Name Part Number Code Part Name Part Number A/C Compressor 90980–11271 Door Courtesy SW (Driver’s Side) 90980–12340 A/C Condenser Fan Motor 90980–11410 Door Courtesy SW (Front Passenger’s Side) Air Fuel Ratio Sensor (Bank 1 Sensor 1) 90980–11178 Door Lock Assembly (Driver’s Side) Airbag Sensor (Front LH)
  • Page 68 Code Part Name Part Number Code Part Name Part Number Junction Connector 90980–11529 Room Lamp (Center) 81366–68010 Junction Connector Room Lamp (Left Quarter) 90980–12342 90980–11542 90980–11542 Junction Connector Skid Control ECU with Actuator 90980–12020 Junction Connector 90980–10976 Speed Sensor (Front LH) 90980–11003 90980–11003 Junction Connector...
  • Page 69 M OVERALL ELECTRICAL WIRING DIAGRAM 2005 SCION tC (EWD572U)
  • Page 70 [A] : System Title [F] : Junction Block (The number in the circle is the J/B No. and the connector code is shown beside it). [B] : Indicates the wiring color. Junction Blocks are shaded to clearly separate them Wire colors are indicated by an alphabetical code. from other parts.
  • Page 71 SYSTEM INDEX SYSTEMS LOCATION SYSTEMS LOCATION ........... . . 15–2 Light Reminder .
  • Page 72 1 tC P o w e r S o urc e S ta rting Ign ition 7. 5A Ignition SW 3 IE4 1 IE4 (A/T) 1 EA1 3 IH1 (A/T) (M/T) 6 IE1 Relay Relay Engine Control Module<3–9> 3 EA1 W–B 4 IE1 FL MAIN...
  • Page 73 M OVERALL ELECTRICAL WIRING DIAGRAM Horn (High) Horn (Low) J 1 ( A ) , J 2 ( B ) Junction Connector Horn SW Spiral Cable Integration Relay<14–7> Charge Combination Meter J 1(A), J 2(B) Junction Connector G 1(A), G 2(B) Generator 7.
  • Page 74 Memo 2005 SCION tC (EWD572U)
  • Page 75 M OVERALL ELECTRICAL WIRING DIAGRAM Door Courtesy SW (Driver’ s Side) <10–2> Unlock Warning Junction SW<14–3> Connector BR–W W–B W–B Junction Connector Junction Connector W–B W–B W–B A/C Control Assembly IG2 Relay W–B W–B W–B EFI Relay W–B W–B Fuel Suction Pump and Gage Assembly C/OPN Relay...
  • Page 76 3 tC ( Cont’ d ) ( Cont. next page ) E n gine C on trol * 1 : Malfunction Indicator Lamp * 2 : Shielded Junction Connector Throttle Body Assembly M– VTA1 VTA2 9 IE1 10 IE1 5 IE1 11 A IGSW MREL...
  • Page 77 M OVERALL ELECTRICAL WIRING DIAGRAM MG/C Relay <23–3> Combination Meter<21–3> FAN NO. 2 Relay <22–3> Stop Lamp SW <11–4> Airbag Sensor Assembly Center<16–2> J 4(A), J 5(B) Diode (Idle–Up) Junction Connector RR DEF I/UP Fuse<19–2> Junction Connector TAIL Fuse <8–4> W–B W–B W–B...
  • Page 78 3 tC ( Cont’ d ) E n gine C on tro l Airbag Sensor Assembly Center <16–2> 12 IE1 13 1E WFSE Data Link Connector 3 W–B...
  • Page 79 M OVERALL ELECTRICAL WIRING DIAGRAM Transmission Revolution Sensor (Turbine) Transmission Revolution Sensor (Counter Gear) 15A IG2 EFI Relay W–B W–B 10A GAUGE IG1 Relay W–B W–B 25A AM1 30A AM2 120A ALT 20A EFI 10A ETCS 2005 SCION tC (EWD572U)
  • Page 80 4 tC ( Cont’ d ) ( Cont. next page ) E le ctro nic ally C o ntro lle d T ra ns m is s io n an d A /T In dic ato r Engine Control System <3–7><3–8><3–9><3–10><3–11><3–12>...
  • Page 81 M OVERALL ELECTRICAL WIRING DIAGRAM Transmission Control SW Junction Junction Connector Connector Shift Lock Control ECU 2005 SCION tC (EWD572U)
  • Page 82 Memo 2005 SCION tC (EWD572U)
  • Page 83 M OVERALL ELECTRICAL WIRING DIAGRAM 10A MET IG2 Stop Lamp SW 15A IG2 Electronically Controlled Transmission and (A/T) A/T Indicator System<4–7> ( M/T ) ( M/T ) Cruise Control Clutch SW EFI Relay W–B W–B 7. 5A ECU–IG ( M/T ) IG1 Relay W–B W–B...
  • Page 84 5 tC ( Cont’ d ) C ruise C o ntro l Engine Control System <3–7><3–8><3–9><3–10><3–11><3–12> 21 E 18 E 19 A 19 B GE01 M– VTA1 VTA2 WFSE E 4 ( A ) , E 5 ( B ) , E 6 ( C ) , E 7 ( D ) , E 8 ( E ) Engine Control Module ME01 15 A...
  • Page 85 M OVERALL ELECTRICAL WIRING DIAGRAM Option Connector (Front Fog Lamp) Combination Meter <9–3> Taillight System <8–2> Option Connector ( Front Fog Lamp SW ) Headlamp (RH Low) W–B W–B Headlamp (LH Low) W–B W–B Combination Meter Beam Headlamp (RH High) W–B Headlamp (LH High) Combination SW...
  • Page 86 7 tC P ow e r S ou rc e T ur n S ign al a nd H az a rd W a rn in g L igh t FLASH Relay GAUGE Ignition SW Relay Integraton Relay <14–8> J 1(A), J 2(B) Junction Connector Combination SW 12 IB2...
  • Page 87 M OVERALL ELECTRICAL WIRING DIAGRAM License Plate Lamp ( RH ) W–B License Plate Lamp (LH) W–B Rear Combination Lamp (RH) W–B W–B Tail Junction Connector Rear Combination Lamp ( LH ) W–B Tail Parking Lamp ( RH ) W–B Parking Lamp ( LH ) W–B W–B...
  • Page 88 9 tC P ow e r S o urc e Illu m in ation 4 1F 1 1M Ignition SW 3 IE4 Power Circuit 1 II1 10 A ILL+ TRLY Rheostat ILL– ILL– TAIL 13 A 2 II2 FL MAIN 3.
  • Page 89 M OVERALL ELECTRICAL WIRING DIAGRAM Noise Filter (DOME) Junction Connector W–B W–B Room Lamp ( Left Quarter ) Diode (Room Lamp) Map Lamp W–B DOOR Room Lamp (Center) W–B DOOR Transponder Key Amplifier Ignition Key Cylinder Lamp W–B Back Door Lock Assembly W–B Courtesy SW Door Courtesy SW...
  • Page 90 11 tC P o w e r S o urc e B a c k– U p L igh t S top L ig h t 11 IH2 (M/T) Ignition SW ( M/T ) 1 1F 3 1F 1 1G 16 IH2 17 1E 7 1M...
  • Page 91 M OVERALL ELECTRICAL WIRING DIAGRAM Windshield Washer Motor W–B Washer SW W–B W–B Wiper SW 30A FR WIP 15A FR WSH W–B IG1 Relay W–B W–B 25A AM1 W–B W–B 120A ALT 2005 SCION tC (EWD572U)
  • Page 92 13 tC P o w e r S o urc e P o w e r W ind ow Power Window Master SW 11 IB2 PLS2 SGND MPX1 Ignition SW 1 IB2 16 IB2 17 IB2 13 IB2 20 IB2 SSRB PLS2 1 II2...
  • Page 93 M OVERALL ELECTRICAL WIRING DIAGRAM Detection SW Junction Key Unlock Connector W–B W–B W–B W–B Key Lock Door Lock Control SW Unlock W–B Lock Power Window Master SW Unlock W–B Lock Combination Meter <17–4> Transponder Key ECU<3–4> Unlock Warning SW W–B W–B 7.
  • Page 94 14 tC ( Cont’ d ) O p tio n C on n ec tor D o o r L o ck C o ntro l B a ck D o or O pe ne r W ire les s D o or L oc k C on trol ( T V IP ) I 6(A) Integration Relay...
  • Page 95 M OVERALL ELECTRICAL WIRING DIAGRAM J 4 ( A ) , J 5 ( B ) Junction Connector Junction Connector Combination Meter Combination Meter <4–12> ( A/T ) ( A/T ) A/C Control Assembly <23–6> Tire Pressure Tire Pressure Warning SW Junction Connector W–B W–B...
  • Page 96 Memo 2005 SCION tC (EWD572U)
  • Page 97 M OVERALL ELECTRICAL WIRING DIAGRAM ( *1 ) Y–B (*1) (*1) Y–B (*1) Y–B ( *1 ) (*1) Y–B (*1) (*1) ( *1 ) ( *1 ) Y–G Y–G (*1) (*1) Y–R Y–R (*1) (*1) Y–B Y–B (*1) (*1) Y–G Engine Control Module<3–11>...
  • Page 98 16 tC ( Cont’ d ) S R S * 1 : w/ Side Airbag Front Seat Inner Belt (Driver’ s Side) Seat Position Buckle SW Airbag Sensor 10 A DBE+ DBE– DSP+ DSP– PBE+ A11 ( A ) , A12 ( B ) , A13 ( C ) Airbag Sensor Assembly Center SFD+ SFD–...
  • Page 99 M OVERALL ELECTRICAL WIRING DIAGRAM Unlock Warning SW <14–3> Door Courtesy SW ( Driver’ s Side ) <10–3> W–B W–B Front Seat Inner Belt (Front Passenger’ s Side) Buckle SW Occupant Detection Junction Connector Driver’ s Seat Belt Front Seat Inner Belt (Driver’...
  • Page 100 18 tC P ow e r S o urc e S hift L oc k S liding R oo f Ignition SW 1 1F 3 1F 1 1G Sliding Roof Control ECU SLS+ 17 1E 7 1M OPEN/UP CLOSE/DOWN Shift Lock Control ECU SLS–...
  • Page 101 M OVERALL ELECTRICAL WIRING DIAGRAM 15A CIG W–B W–B W–B Operation SW Select SW BR–Y W–B W–B J 4(A), J 5(B) Junction Connector 7. 5A ACC Right /Down Left Outer Rear View Mirror (RH) Down Outer Rear View Mirror ( LH ) Right Left Diode (Idle–Up)
  • Page 102 20 tC P o w er S ou rc e P o w e r O u tlet A u dio S ys te m Ignition SW Antenna Amplifier 8 IE1 R 2 ( A ) , R 3 ( B ) Radio Receiver Assembly FL–...
  • Page 103 M OVERALL ELECTRICAL WIRING DIAGRAM Seat Belt Warning MAINT System<17–3> REQD Driver’ s Seat Belt SRS System<16–1> Seat Belt Warning Fuel System<17–2> Key Reminder System<17–4> Light Reminder System<17–4> Key Reminder System<17–4> Light Reminder System<17–4> Engine Control Module<3–11> Temp. Fuel Sender Fuel Fuel Suction Pump and Gage Assembly...
  • Page 104 21 tC ( Cont’ d ) C o m bina tio n M ete r Turn Signal and Hazard Warning Light Electronically Controlled Transmission System<7–3> and A/T Indicator System<4–10><4–11> Combination Meter 13 IH2 Junction Connector W–B 5 IH1 Front Right Fender Front Left Side of the Cylinder Head...
  • Page 105 M OVERALL ELECTRICAL WIRING DIAGRAM Diode (Fan) MG/C Relay <23–3> FAN NO. 3 Relay A/C Condenser Fan Motor W–B W–B FAN NO. 2 Relay Pressure SW W–B W–B FAN NO. 1 Relay W–B W–B Radiator Fan Motor 7. 5A ECU–IG W–B W–B IG1 Relay...
  • Page 106 Memo 2005 SCION tC (EWD572U)
  • Page 107 M OVERALL ELECTRICAL WIRING DIAGRAM W–B Damper Servo Motor (Air Inlet) Diode ( Fan ) <22–4> J 1(A), J 2(B) Junction Connector Engine Control Module<3–12> A/C Compressor 10A A/C 7. 5A ECU–IG 10A GAUGE W–B 25A AM1 W–B 120A ALT Cut Off 40A HTR 10A ECU–B...
  • Page 108 23 tC ( Cont’ d ) A ir C o nd ition in g Ambient Temp. Sensor 9 IE2 E 5(B), E 8(E) A/C Control Assembly 30 B Engine Control Module 19 E SG–TAM TAMOUT SEAT SECU RrDEF A/CS A/CS ACMG S5–TPM SG–TPM...

  • Page 109: Power Source

    Power Source 120A ALT 30A RDI 7. 5A ALT–S 30A CDS 10A ETCS 50A ABS NO. 1 15A IGN 40A ABS NO. 2 10A HORN 40A HTR 10A TURN–HAZ Generator 10A OBD2 30A AM2 20A EFI 10A ECU–B 30A DCC 7.
  • Page 110 10A TAIL 7. 5A PANEL T–LP Relay 25A AM1 15A CIG 7. 5A ACC 15A IG2 10A MET IG2 Ignition SW 7. 5A RR DEF I/UP 30A DEF DEF Relay 20A FL DOOR 7. 5A 20A FR DOOR 20A DOOR 15A FR FOG 7.
  • Page 111 Power Source Service Hints H–LP Relay 5–3 : Closed with the light control SW at HEAD position or dimmer SW at FLASH position I5 Ignition SW 2–3 : Closed with the ignition key at ACC or ON position 2–4 : Closed with the ignition key at ON or ST position 2–1 : Closed with the ignition key at ST position 7–6 : Closed with the ignition key at ON or ST position 7–8 : Closed with the ignition key at ST position...
  • Page 112 Memo 2005 SCION tC (EWD572U)

  • Page 113: Starting

    Starting 7. 5A Ignition SW ( A/T ) (A/T) ( M/T ) Clutch Start SW Relay 4 IE1 120A W–B 4 IH1 FL MAIN 3. 0W Junction Connector B–R Battery S 4 ( A ) , S 5 ( B ) Starter 2005 SCION tC (EWD572U)
  • Page 114 Service Hints S4 (A), S5 (B) Starter Point closed with the shift lever at P or N position and the ignition SW at ST position (A/T) Point closed with the clutch pedal depressed and the ignition SW at ST position (M/T) I5 Ignition SW 2–1, 7–8 : Closed with the ignition SW at ST position : Parts Location...

  • Page 115: Ignition

    Ignition From Power Source System ( See Page 48 ) IGT1 IGT2 IGT3 IGT4 IGF1 Engine Control Module 2005 SCION tC (EWD572U)
  • Page 116 Service Hints IG2 Relay 5–3 : Closed with the ignition SW at ON or ST position : 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 (Engine Compartment Left) : Junction Block and Wire Harness Connector Code See Page...

  • Page 117: Charging

    Charging From Power Source System ( See Page 48 ) 7. 5A ECU–IG 1 1M 7 1S FL MAIN 3. 0W Battery IC Regulator G 1(A), G 2(B) Generator 2005 SCION tC (EWD572U)
  • Page 118 Service Hints G1 (A), G2 (B) Generator (A) 4–Ground : Below 1.5 volts with the ignition SW at ON position and the engine not running (B) 1–Ground : 13.2–14.0 volts with the engine running at 5000 rpm and 115°C (239°F) : Parts Location Code See Page...

  • Page 119: Engine Control

    Engine Control From Power Source System ( See Page 48 ) 7. 5A Y(A/T) 2 1E 18 1E 2 EA1 5 1E 8 1A 11 1B B ( M/T ) B(A/T) 7 1M 1 1S W–B 2005 SCION tC (EWD572U)
  • Page 120 From Power Source System ( See Page 48 ) 7. 5A RR DEF TAIL STOP * 1 : Shielded I/UP 10 1E MREL IGSW BATT E 4 ( A ) , E 5 ( B ) , E 6 ( C ) , E 7 ( D ) , E 8 ( E ) Engine Control Module HA1A A1A+...
  • Page 121 Engine Control Junction Connector Throttle Body Assembly M– VTA1 VTA2 GE01 M– VTA1 VTA2 E 4 ( A ) , E 5 ( B ) , E 6 ( C ) , E 7 ( D ) , E 8 ( E ) Engine Control Module NE–...
  • Page 122 * 1 : Shielded 18 IC2 11 IC2 Pressure Sensor Leak Detection Pump Assembly ACMG PPMP VPMP MPMP E 4 ( A ) , E 5 ( B ) , E 6 ( C ) , E 7 ( D ) , E 8 ( E ) Engine Control Module IGT1 IGT2...
  • Page 123 Engine Control From Power Source System ( See Page 48 ) ETCS OBD2 Accelerator Position Sensor 5 IE1 12 IE1 VCP1 VPA1 VCP2 VPA2 Data Link Connector 3 VCPA VCP2 VPA2 EPA2 E 4 ( A ) , E 5 ( B ) , E 6 ( C ) , E 7 ( D ) , E 8 ( E ) WFSE Engine Control Module THWO...
  • Page 124 From Power Source System ( See Page 48 ) ECU–B Power Circuit 15 IE2 Skid Control ECU with Actuator FL– FR– RL– RR– Speed Sensors 2005 SCION tC (EWD572U)
  • Page 125 Engine Control System Outline The engine control system utilizes a microcomputer and maintains overall control of the engine, transaxle etc. An outline of the engine control is given here. 1. Input Signals (1) Engine coolant temp. signal circuit The engine coolant temp. sensor detects the engine coolant temp. and has a built–in thermistor with a resistance, which varies according to the engine coolant temp..
  • Page 126 2. Control System ∗ SFI system The SFI system monitors the engine condition through the signals input from each sensor to the engine control module. And the control signal is output to TERMINALS #1, #2, #3 and #4 of the engine control module to operate the fuel injector (Inject the fuel).
  • Page 127 Engine Control : 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 (Engine Compartment Left) Engine Room R/B No.2 (Inside of the Engine Room R/B Box) : Junction Block and Wire Harness Connector Code See Page...
  • Page 128 : Splice Points Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points Engine Room Main Wire Engine Wire Engine Wire Engine Wire 2005 SCION tC (EWD572U)

  • Page 129: Engine Immobilizer System

    Engine Immobilizer System From Power Source System ( See Page 48 ) MREL BATT IGSW E 4 ( A ) , E 5 ( B ) , E 6 ( C ) , E 7 ( D ) , E 8 ( E ) Engine Control Module ME01 Junction...
  • Page 130 From Power Source System ( See Page 48 ) ECU–B Data Link Connector 3 Transponder Key Amplifier Transponder Key Coil ANT1 ANT2 CODE TXCT CODE TXCT AGND Transponder Key ECU EFII EFIO SECU Security Indicator Lamp Junction Connector W–B 2005 SCION tC (EWD572U)
  • Page 131 Engine Immobilizer System Service Hints E4 (A), E6 (C), E7 (D), E8 (E) Engine Control Module BATT–Ground : Always approx. 12 volts IGSW–Ground : Approx. 12 volts with the ignition SW at ON position EOM–Ground : Always continuity E01, E02, E03, E04, E1, ME01–Ground : Always continuity T8 Transponder Key ECU 1–Ground : Always approx.
  • Page 132 Memo 2005 SCION tC (EWD572U)

  • Page 133: Headlight

    Headlight H–LP Relay H–LP H–LP H–LP H–LP LH HI RH HI LH LO RH LO MAIN HRLY HEAD Tail Head FL MAIN High 3. 0W Flash Battery W–B 2005 SCION tC (EWD572U)
  • Page 134 Service Hints C7 Combination SW 13–16 : Continuity with the light control SW at HEAD position 7–16 : Continuity with the dimmer SW at FLASH position or the dimmer SW at HIGH position 8–16 : Continuity with the dimmer SW at FLASH position : Parts Location Code See Page...

  • Page 135: Turn Signal And Hazard Warning Light

    Turn Signal and Hazard Warning Light From Power Source System ( See Page 48 ) TURN–HAZ GAUGE FLASH Relay J 1 ( A ) , J 2 ( B ) Junction Connector Outer Rear View Mirror (LH) J11(A), J12(B) Junction Connector Junction Connector...
  • Page 136 FLASH Relay Combination SW Hazard SW Outer Rear View Mirror (RH) W–B Junction Connector W–B W–B 2005 SCION tC (EWD572U)
  • Page 137 Turn Signal and Hazard Warning Light Service Hints FLASH 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 138 Memo 2005 SCION tC (EWD572U)

  • Page 139: Interior Light

    Interior Light From Power Source System ( See Page 48 ) 7. 5A ECU–IG ECU–B I 6 ( A ) Integration Relay ECUB LSD1 DCTY PCTY BCTY 27 1E W–B 2005 SCION tC (EWD572U)
  • Page 140 From Power Source System ( See Page 48 ) 7. 5A DOME W–B Junction Connector 2005 SCION tC (EWD572U)
  • Page 141 Interior Light System Outline The interior light is controlled by the integration relay. This system has following features. Illuminated Entry System ∗ When a door is unlocked through a key operation or transmitter operation, or if a door is opened or closed, the illuminated entry system turns ON the room lamp (Center), map lamp and the ignition key cylinder lamp.
  • Page 142 : Splice Points Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points Floor Wire Roof Wire Roof Wire 2005 SCION tC (EWD572U)

  • Page 143: Illumination

    Illumination From Power Source System ( See Page 48 ) GAUGE 7. 5A PANEL T–LP Relay TRLY I 6 ( A ) Integration Relay TAIL J 4(A), J 5(B) Junction Connector 120A Tail Head Combination SW FL MAIN 3. 0W Battery Junction Connector 2005 SCION tC (EWD572U)
  • Page 144 From Power Source System ( See Page 48 ) ECU–B Combination Meter Power Circuit ILL+ ILL– ILL– Rheostat Junction Connector J 4 ( A ) , J 5 ( B ) Junction Connector 2005 SCION tC (EWD572U)
  • Page 145 Illumination Service Hints C7 Combination SW 14–16 : Continuity with the light control SW at HEAD or TAIL position : 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 (Engine Compartment Left) : Junction Block and Wire Harness Connector Code...
  • Page 146 Memo 2005 SCION tC (EWD572U)

  • Page 147: Taillight

    Taillight T–LP Relay TAIL TRLY TAIL Tail Head Combination SW FL MAIN 3. 0W W–B Battery W–B 2005 SCION tC (EWD572U)
  • Page 148 Service Hints C7 Combination SW 14–16 : Continuity with the light control SW at HEAD or TAIL position : 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 (Engine Compartment Left) : Junction Block and Wire Harness Connector Code...

  • Page 149: Stop Light

    Stop Light From Power Source System ( See Page 48 ) STOP W–B Junction Connector 2005 SCION tC (EWD572U)
  • Page 150 Service Hints S8 Stop Lamp 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) Floor Wire and Instrument Panel J/B (Lower Finish Panel) Engine Room Main Wire and Instrument Panel J/B (Lower Finish Panel) : Connector Joining Wire Harness and Wire Harness...

  • Page 151: Back–Up Light

    Back–Up Light From Power Source System ( See Page 48 ) GAUGE ( M/T ) ( M/T ) W–B 2005 SCION tC (EWD572U)
  • Page 152 Service Hints B1 Back–Up Lamp SW (M/T) 2–1 : Closed with the shift lever in R position P1 Park/Neutral Position SW (A/T) 2–1 : Closed with the shift lever in R position : Parts Location Code See Page Code See Page Code See Page : Junction Block and Wire Harness Connector...

  • Page 153: Front Wiper And Washer

    Front Wiper and Washer From Power Source System ( See Page 48 ) FR WSH FR WIP Combination SW Wiper Relay Windshield Washer Motor Washer SW W–B Wiper SW 17 1E Windshield Wiper Motor 2005 SCION tC (EWD572U)
  • Page 154 System Outline With the ignition SW turned on, the current flows to TERMINAL 17 of the wiper and washer SW and TERMINAL 2 of the windshield wiper motor through the FR WIP fuse. The current flows to TERMINAL 1 of the windshield washer motor through the FR WSH fuse.
  • Page 155 Front Wiper and Washer : Ground Points Code See Page Ground Points Location Front Right Fender Cowl Brace LH Cowl Brace RH 2005 SCION tC (EWD572U)
  • Page 156 Memo 2005 SCION tC (EWD572U)

  • Page 157: Remote Control Mirror

    Remote Control Mirror From Power Source System ( See Page 48 ) 7. 5A Outer Mirror SW 2005 SCION tC (EWD572U)
  • Page 158 Service Hints O1 Outer 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 159: Power Window

    Power Window From Power Source System ( See Page 48 ) GAUGE DOOR Power Window Master SW PLS2 SGND SSRB PLS2 Power Window Regulator Motor (Front LH) Junction Connector 2005 SCION tC (EWD572U)
  • Page 160 From Power Source System ( See Page 48 ) 7. 5A DOOR ECU–IG ECU–B Power Window Master SW DOOR ALTB Integration Relay MPX1 DCTY PCTY ECUB Power Window SW ( Front Passenger’ s Side ) MPX1 PLS2 SGND SSRB PLS2 Power Window Regulator Motor Junction ( Front RH )
  • Page 161 Power Window System Outline 1. Manual Up and Down Function This function operates the window to open or close while the power window switch is being pulled up or pushed down (Should be pulled up and down halfway for manual operation.). The window stops as soon as the switch is released. 2.
  • Page 162 : Connector Joining Wire Harness and Wire Harness Code See Page Joining Wire Harness and Wire Harness (Connector Location) Front Door LH Wire and Instrument Panel Wire (Left Kick Panel) Front Door RH Wire and Instrument Panel Wire (Right Kick Panel) Floor No.2 Wire and Instrument Panel Wire (Right Kick Panel) : Ground Points Code...

  • Page 163: Door Lock Control

    Door Lock Control From Power Source System ( See Page 48 ) 7. 5A DOOR ECU–IG ALTB I 6 ( A ) Integration Relay LSWD ACTD 17 1E Door Lock Assembly ( Driver’ s Side ) W–B W–B Junction Connector 2005 SCION tC (EWD572U)
  • Page 164 From Power Source System ( See Page 48 ) ECU–B ECUB I 6 ( A ) Integration Relay ACT+ ACT– DCTY PCTY DBKL Junction Connector Door Lock Assembly ( Front Passenger’ s Side ) W–B Junction Connector Junction Connector 2005 SCION tC (EWD572U)
  • Page 165 Door Lock Control System Outline The door lock control is a system controlled by various signals input into the integration relay. 1. Manual Unlock Operation When the door lock control SW of the driver’s or passenger’s side door is pushed to UNLOCK, the door unlocks. 2.
  • Page 166 : Ground Points Code See Page Ground Points Location Cowl Brace LH Cowl Brace RH Quarter Panel LH : Splice Points Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points Front Door RH Wire Front Door LH Wire 2005 SCION tC (EWD572U)

  • Page 167: Wireless Door Lock Control

    Wireless Door Lock Control TRLY I 6 ( A ) Integration Relay HRLY HORN FL MAIN 3. 0W W–B Battery 2005 SCION tC (EWD572U)
  • Page 168 From Power Source System ( See Page 48 ) 7. 5A DOOR ECU–IG FLASH Relay ALTB I 6 ( A ) Integration Relay LSWD ACTD ACT+ ACT– Door Lock Assembly Door Lock Assembly (Driver’ s Side) (Front Passenger’ s Side) W–B W–B W–B...
  • Page 169 Wireless Door Lock Control I 6 ( A ) Integration Relay DCTY PCTY BCTY ECUB W–B Junction Connector 2005 SCION tC (EWD572U)
  • Page 170 From Power Source System ( See Page 48 ) 7. 5A ECU–B DOME 13 1B W–B W–B 2005 SCION tC (EWD572U)
  • Page 171 Wireless Door Lock Control System Outline Door lock control (Lock and unlock) and panic control (Theft alarm and flash) is performed by remote control, without the ignition key inserted in the door key cylinder, using low–power electrical waves emitted by a transmitter. 1.
  • Page 172 : 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 (Engine Compartment Left) : Junction Block and Wire Harness Connector Code See Page Junction Block and Wire Harness (Connector Location) Floor Wire and Instrument Panel J/B (Lower Finish Panel) Engine Room Main Wire and Instrument Panel J/B (Lower Finish Panel) Instrument Panel Wire and Instrument Panel J/B (Lower Finish Panel)

  • Page 173: Back Door Opener

    Back Door Opener From Power Source System ( See Page 48 ) 7. 5A DOOR ECU–IG ECU–B ALTB ECUB BACT BDSU Power Circuit 12 IC1 2005 SCION tC (EWD572U)
  • Page 174 Speed Sensors FL– FR– RL– RR– Skid Control ECU with Actuator 2005 SCION tC (EWD572U)
  • Page 175 Back Door Opener System Outline If the vehicle is stationary (Slower than 5 km/h), the back door opener motor activates with control of integration relay when back door opener SW is pushed. It results in releasing latch of back door to open back door. Service Hints Integration Relay 4, 6–Ground : Always approx.
  • Page 176 Memo 2005 SCION tC (EWD572U)

  • Page 177: Sliding Roof

    Sliding Roof From Power Source System ( See Page 48 ) S/ROOF Sliding Roof Control ECU OPEN/UP CLOSE/DOWN Sliding Roof Control SW Junction Connector W–B W–B 2005 SCION tC (EWD572U)
  • Page 178 From Power Source System ( See Page 48 ) 7. 5A DOOR ECU–IG ECU–B ALTB Integration Relay DCTY PCTY ECUB Combination Meter Power Circuit Skid Control ECU with Actuator W–B FL– FR– RL– RR– Speed Sensors 2005 SCION tC (EWD572U)
  • Page 179 Sliding Roof System Outline Current is always applied from the S/ROOF fuse to TERMINAL 5 of the sliding roof control ECU. With the ignition SW turned on, the current from the ECU–IG fuse flows to TERMINAL 8 of the sliding roof control ECU. 1.
  • Page 180 : Connector Joining Wire Harness and Wire Harness Code See Page Joining Wire Harness and Wire Harness (Connector Location) Roof Wire and Instrument Panel Wire (Cowl Top Side Panel LH) Engine Room Main Wire and Instrument Panel Wire (Behind of the Combination Meter) Engine Wire and Instrument Panel Wire (Cowl Side Panel RH) Floor No.2 Wire and Instrument Panel Wire (Right Kick Panel) : Ground Points...

  • Page 181: Shift Lock

    Shift Lock From Power Source System ( See Page 48 ) 7. 5A 7. 5A ECU–IG STOP Stop Lamp SW Shift Lock Control ECU SLS+ SLS– KLS+ Unlock Warning SW Junction Connector Junction Connector 2005 SCION tC (EWD572U)
  • Page 182 System Outline When the ignition SW is turned to ACC position the current from the ACC fuse flows to TERMINAL 6 of the shift lock control ECU. When the ignition SW is turned to ON position, the current from the ECU–IG fuse flows to TERMINAL 1 of the shift lock control ECU.
  • Page 183 ECT and A/T Indicator From Power Source System ( See Page 48 ) 7. 5A STOP ETCS 5 IE1 MREL BATT IGSW NC– E 4 ( A ) , E 5 ( B ) , E 6 ( C ) , E 7 ( D ) , E 8 ( E ) Engine Control Module GE01 M–...
  • Page 184 Data Link Connector 3 WFSE Accelerator Position Sensor VCP1 VPA1 VCP2 VPA2 NT– VCPA VCP2 VPA2 EPA2 WFSE E 4 ( A ) , E 5 ( B ) , E 6 ( C ) , E 7 ( D ) , E 8 ( E ) Engine Control Module SL1+ SL1–...
  • Page 185 ECT and A/T Indicator From Power Source System ( See Page 48 ) GAUGE Park/Neutral Position SW 11 IH2 20 1E NSSD E 4 ( A ) , E 5 ( B ) , E 6 ( C ) , E 7 ( D ) , E 8 ( E ) Engine Control Module 5 IH1 Combination Meter...
  • Page 186 From Power Source System ( See Page 48 ) ECU–B Speed Sensors FL– FR– RL– RR– Skid Control ECU with Actuator Power Circuit Combination Meter 2005 SCION tC (EWD572U)
  • Page 187 ECT and A/T Indicator System Outline Previous automatic transaxle have selected each gear shift using the mechanically controlled throttle hydraulic pressure, governor hydraulic pressure and lock–up hydraulic pressure. The electronically controlled transmission, however, electrically controls the line pressure and lock–up pressure etc., through the solenoid valve. Engine control module controls each solenoid valve based on the input signals from each sensor, which makes smooth driving possible by shift selection for each gear that is most appropriate to the driving conditions at that time.
  • Page 188 : 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 (Engine Compartment Left) Engine Room R/B No.2 (Inside of the Engine Room R/B Box) : Junction Block and Wire Harness Connector Code See Page...

  • Page 189: Cruise Control

    Cruise Control From Power Source System ( See Page 48 ) 7. 5A STOP GAUGE ECU–IG ETCS 15 1S 20 IH2 20 IE2 5 IE1 (A/T) 10 B MREL BATT IGSW ST1– E 4 ( A ) , E 5 ( B ) , E 6 ( C ) , E 7 ( D ) , E 8 ( E ) Engine Control Module ME01 SL1+...
  • Page 190 Data Link Connector 3 Spiral Cable CANCEL WFSE – SET + RES ON–OFF WFSE E 4 ( A ) , E 5 ( B ) , E 6 ( C ) , E 7 ( D ) , E 8 ( E ) Engine Control Module GE01 M–...
  • Page 191 Cruise Control From Power Source System ( See Page 48 ) ECU–B Power Circuit Combination Meter 15 IE2 Skid Control ECU with Actuator FL– FR– RL– RR– Speed Sensors 2005 SCION tC (EWD572U)
  • Page 192 System Outline The cruise control system is a constant vehicle speed controller in which control of the switch on the instrument panel makes it possible to automatically adjust the opening of the engine throttle valve without depressing of the accel pedal. 1.
  • Page 193 Cruise Control : 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 (Engine Compartment Left) : 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 (Lower Finish Panel) Instrument Panel Wire and Instrument Panel J/B (Lower Finish Panel)
  • Page 194 Memo 2005 SCION tC (EWD572U)

  • Page 195: Tire Pressure Warning System

    ABS and Tire Pressure Warning System From Power Source System ( See Page 48 ) NO. 1 NO. 2 RL– RR– Skid Control ECU with Actuator GND1 GND2 FL– FR– 16 IE2 2005 SCION tC (EWD572U)
  • Page 196 From Power Source System ( See Page 48 ) Data Link Connector 3 7. 5A ECU–IG STOP Stop Lamp SW 3 1S 12 1D 12 1B Skid Control ECU with Actuator INIT WTIR 17 IE2 6 IE2 TAMOUT B ( A/T ) SG–TAM Junction Connector...
  • Page 197 ABS and Tire Pressure Warning System From Power Source System ( See Page 48 ) ( A/T ) GAUGE MET IG2 ECU–B ( A/T ) Combination Meter Power Circuit B ( A/T ) 2005 SCION tC (EWD572U)
  • Page 198 Combination Meter 5 1C 5 IH1 2005 SCION tC (EWD572U)
  • Page 199 ABS and Tire Pressure Warning System System Outline ∗ ABS system This system controls the respective brake fluid pressures acting on the disc brake cylinders of the right front wheel, left front wheel and rear wheels when the brakes are applied in a panic stop so that the wheels do not lock. This results in improved directional stability and steerability during panic braking.
  • Page 200 : Connector Joining Wire Harness and Wire Harness Code See Page Joining Wire Harness and Wire Harness (Connector Location) Floor Wire and Instrument Panel Wire (Left Kick Panel) Engine Room Main Wire and Instrument Panel Wire (Behind of the Combination Meter) Engine Wire and Instrument Panel Wire (Cowl Side Panel RH) Engine Wire and Instrument Panel Wire (Cowl Side Panel RH) Floor No.2 Wire and Instrument Panel Wire (Right Kick Panel)
  • Page 201 Memo 2005 SCION tC (EWD572U)
  • Page 202 NOTICE: When inspecting or repairing the SRS, perform service in accordance with the following precautionary instructions and the procedure, and precautions in the Repair Manual applicable for the 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 203 From Power Source System ( See Page 48 ) MET IG2 Data Link Connector 3 Engine Control Module F/PS GSW2 A11 ( A ) , A12 ( B ) , A13 ( C ) Airbag Sensor Assembly Center D– D2– P–...
  • Page 204 * 1 : w/ Side Airbag Curtain Shield Curtain Shield Side Airbag Sensor Side Airbag Sensor Airbag Sensor Airbag Sensor Airbag Squib Airbag Squib (LH) (RH) ( LH ) ( RH ) (Rear LH) (Rear RH) VUPL VUPR VUCL ESCL VUCR ESCR VUPD...
  • Page 205 * 1 : w/ Side Airbag Front Seat Inner Belt (Driver’ s Side) Seat Position Buckle SW Airbag Sensor DBE+ DBE– DSP+ DSP– A11 ( A ) , A12 ( B ) , A13 ( C ) Airbag Sensor Assembly Center SFD+ SFD–...
  • Page 206 System Outline ∗ The SRS airbag are provided for the driver and front passenger. The SRS airbags have been designed to help reducing the shocks to the heads and chests of the driver and front passenger in the event of a severe frontal impact collision as supplements to the seat belts.
  • Page 207 : Ground Points Code See Page Ground Points Location Front Left Side of the Cylinder Head Cowl Brace LH Cowl Brace RH 2005 SCION tC (EWD572U)
  • Page 208 Memo 2005 SCION tC (EWD572U)

  • Page 209: Horn

    Horn From Power Source System ( See Page 48 ) HORN HORN Relay Horn ( Low ) Horn ( High ) 2005 SCION tC (EWD572U)
  • Page 210 Service Hints HORN Relay 5–3 : Closed with the horn SW at on : 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 (Engine Compartment Left) : Junction Block and Wire Harness Connector Code See Page...

  • Page 211: Cigarette Lighter

    Cigarette Lighter From Power Source System ( See Page 48 ) Cigarette Lighter Junction Connector 2005 SCION tC (EWD572U)
  • Page 212 Service Hints C4 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 213: Power Outlet

    Power Outlet From Power Source System ( See Page 48 ) 7. 5A SOCKET Junction Connector Power Point Socket Relay +ACC Power Point Socket Junction Connector 2005 SCION tC (EWD572U)
  • Page 214 Service Hints P8 Power Point Socket Relay 5–3 : Closed with the ignition SW at ACC or ON 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) Instrument Panel Wire and Instrument Panel J/B (Lower Finish Panel) Instrument Panel Wire and Instrument Panel J/B (Lower Finish Panel)

  • Page 215: Key Reminder

    Key Reminder From Power Source System ( See Page 48 ) ECU–B Combination Meter Power Circuit 2005 SCION tC (EWD572U)
  • Page 216 System Outline Current is always applied from the ECU–B fuse to TERMINAL 3 of the combination meter. When the ignition SW is turned to ON position, the current from the MET IG2 fuse flows to TERMINAL 4 of the combination meter. Key Reminder System When the driver door is opened with the ignition SW off and ignition key remaining in the key cylinder (Unlock warning SW on), a signal is input from the unlock warning SW to TERMINAL 7 of the combination meter, and from the door courtesy SW...

  • Page 217: Light Reminder

    Light Reminder From Power Source System ( See Page 48 ) ECU–B 1 1M T–LP Relay 30 1B 2 1S 7. 5A PANEL TRLY TAIL Power Circuit 120A Tail Head 4 1C 6 1C Combination SW 26 1E 21 1A FL MAIN 3.
  • Page 218 System Outline The current is applied at all times to TERMINAL 3 of the combination meter through the ECU–B fuse. When the ignition SW is turned to ON position, the current flows to TERMINAL 4 of the combination meter through the MET IG2 fuse.

  • Page 219: Seat Belt Warning

    Seat Belt Warning From Power Source System ( See Page 48 ) GAUGE ECU–B 1 1P Combination Meter Passenger’ s Seat Belt Warning Lamp Power Circuit SEAT Junction Connector 2005 SCION tC (EWD572U)
  • Page 220 System Outline Current is always applied from the ECU–B fuse to TERMINAL 3 of the combination meter. When the ignition SW is turned to ON position, the current from the MET IG2 fuse flows to TERMINAL 4 of the combination meter. Seat Belt Warning System When the ignition SW turned on, a signal is input to the combination meter.

  • Page 221: Rear Window Defogger

    Rear Window Defogger From Power Source System ( See Page 48 ) GAUGE Relay RrDEF Rear Window Defogger SW 2005 SCION tC (EWD572U)
  • Page 222 Service Hints DEF Relay Point closed with the ignition SW at ON position and the rear window defogger SW at ON 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)

  • Page 223: Audio System

    Audio System From Power Source System ( See Page 48 ) 7. 5A RAD NO. 1 Antenna Amplifier R 2 ( A ) , R 3 ( B ) Radio Receiver Assembly FL– FR– RL– RR– Speaker Speaker Speaker Speaker ( Front Door LH ) ( Front Door RH ) ( Rear LH )
  • Page 224 Service Hints R2 (A) Radio Receiver Assembly (A) 3–Ground : Approx. 12 volts with the ignition SW at ACC or ON position (A) 4–Ground : Always approx. 12 volts (A) 7–Ground : Always continuity : Parts Location Code See Page Code See Page Code...

  • Page 225: Combination Meter

    Combination Meter From Power Source System ( See Page 48 ) 7. 5A PANEL ECU–B Combination Meter Power Circuit Rheostat Integration Relay 2005 SCION tC (EWD572U)
  • Page 226 Combination Meter ODO/TRIP Buzzer 2005 SCION tC (EWD572U)
  • Page 227 Combination Meter Combination Meter 2005 SCION tC (EWD572U)
  • Page 228 From Power Source System ( See Page 48 ) H–LP RH HI Combination Meter 2005 SCION tC (EWD572U)
  • Page 229 Combination Meter Service Hints C6 Combination Meter 4–Ground : Approx. 12 volts with the ignition SW at ON position 3–Ground : Always approx. 12 volts 1–Ground : Always continuity F9 Fuel Suction Pump and Gage Assembly 2–3 : Approx. 4 Ω with the fuel full Approx.
  • Page 230 Memo 2005 SCION tC (EWD572U)

  • Page 231: Radiator Fan And Condenser Fan

    Radiator Fan and Condenser Fan From Power Source System ( See Page 48 ) 7. 5A ECU–IG FAN NO. 1 FAN NO. 2 FAN NO. 3 Relay Relay Relay E 5 ( B ) , E 8 ( E ) Engine Control Module A/CS ACMG...
  • Page 232 System Outline Fan Motor Operation With the ignition SW turned on, the current through the ECU–IG fuse flows to the FAN NO.1 relay (Coil side), FAN NO.2 relay (Coil side) and FAN NO.3 relay (Coil side). 1. Low Speed Operation Only when the A/C system is activated, the A/C condenser fan motor and the radiator fan motor rotates at low speed.
  • Page 233 Radiator Fan and Condenser Fan : Ground Points Code See Page Ground Points Location Front Left Fender : Splice Points Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points Engine Room Main Wire Engine Room Main Wire 2005 SCION tC (EWD572U)
  • Page 234 Memo 2005 SCION tC (EWD572U)

  • Page 235: Air Conditioning

    Air Conditioning From Power Source System ( See Page 48 ) GAUGE Relay FrHR A/C Control Assembly Blower Motor Control Junction Connector Blower Motor W–B 2005 SCION tC (EWD572U)
  • Page 236 From Power Source System ( See Page 48 ) ECU–B Ambient Temp. Sensor A/C Control Assembly SG–TAM A/CS S5–TPM SG–TPM S5–TP SG–TP FACE MAXHOT MAXCOOL Damper Servo Motor (Air Vent Mode) Damper Servo Motor (Air Mix) 2005 SCION tC (EWD572U)
  • Page 237 Air Conditioning From Power Source System ( See Page 48 ) 7. 5A ECU–IG 7 1S 2 IH2 30 B 19 E A/CS E 5 ( B ) , E 8 ( E ) MG/C Relay Engine Control Module ACMG 3 IH2 2005 SCION tC (EWD572U)
  • Page 238 From Power Source System ( See Page 48 ) 1 1M Speed Sensors FL– FR– RL– RR– Skid Control ECU with Actuator Power Circuit 5 IH1 2005 SCION tC (EWD572U)
  • Page 239 Air Conditioning System Outline 1. Heater Blower Operation When the blower speed is set to a certain level using the blower control SW, the A/C control assembly sends the signals to the blower control to control the blower motor speed. 2.
  • Page 240 : Relay Blocks Code See Page Relay Blocks (Relay Block Location) Engine Room R/B (Engine Compartment Left) Engine Room R/B No.2 (Inside of the Engine Room R/B Box) : 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 (Lower Finish Panel) Instrument Panel Wire and Instrument Panel J/B (Lower Finish Panel) Instrument Panel Wire and Instrument Panel J/B (Lower Finish Panel)

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Ant10 series

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