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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 2004 IS 300.
Applicable models: JCE10 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
• 2003 LEXUS IS 300 Repair Manual
• 2003 LEXUS 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.
TOYOTA MOTOR CORPORATION
Pub. No.
Volume 1
RM1054U1
Volume 2
RM1054U2
NCF259U
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Summary of Contents for Toyota LEXUS IS 300 2003
- Page 1 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. TOYOTA MOTOR CORPORATION 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.
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Page 2: Wiring Diagram
PART NUMBER OF CONNECTORS ....L OVERALL ELECTRICAL WIRING DIAGRAM . M = 2003 TOYOTA MOTOR CORPORATION All rights reserved. This book may not be reproduced or copied, in whole or in part, without the written permission of Toyota Motor Corporation. - 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.
- Page 6 [A] : System Title : 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 = Black W = White BR = Brown from the J/B = Blue...
- Page 7 B HOW TO USE THIS MANUAL Current is applied at all times through the STOP fuse to TERMINAL 2 of the stop light SW. through the rear lights warning light to TERMINAL 4 of the light failure sensor. STOP LIGHT DISCONNECTION WARNING When the ignition SW is turned on and the brake pedal is pressed (Stop light SW on), if the stop light circuit is open, the current flowing from TERMINAL 7 of the light failure sensor to TERMINALS 1, 2 changes, so the light failure sensor detects the disconnection and the warning circuit of the light failure sensor is activated.
- 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. * The letter in the code is from the first letter of the part, and the number indicates its order in parts starting with that letter.
- 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 THIS MANUAL CONNECTOR LIST [A] : Indicates connector to be connected to a part. (The numeral indicates the pin No.) [B] : Junction Connector Indicates a connector which is connected to a short terminal. Junction Connector Junction connector in this manual include a short terminal which is connected to a number of wire harnesses.
- Page 12 L PART NUMBER OF CONNECTORS [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.
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Page 13: C Troubleshooting
C TROUBLESHOOTING VOLTAGE CHECK (a) Establish conditions in which voltage is present at the check point. Example: [A] - Ignition SW on [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 (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: [A] - Ignition SW on [B] - Ignition SW and SW 1 on [C] - Ignition SW, SW 1 and Relay on (Connect the Relay) and SW 2 off (or Disconnect SW 2)
- Page 15 C TROUBLESHOOTING HOW TO REPLACE TERMINAL (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. 2.
- Page 16 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 Tool Access Hole Gray or White : Black Mark)
- 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 from rear. 4. INSTALL TERMINAL TO CONNECTOR (a) Insert the terminal.
- Page 18 ABBREVIATIONS D ABBREVIATIONS The following abbreviations are used in this manual. Air Conditioning Automatic Transmission Anti-Lock Brake System ACIS Acoustic Control Induction System Brake Assist COMB. = Combination Electronic Control Unit Electronic Spark Advance Electronic Throttle Control System-intelligent ETCS-i = EVAP Evaporative Emission Flexible Flat Circuit...
- 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 1. NORMALLY creates sound waves from current switch which may be normally CLOSED flow. 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] Engine Control Module Engine Room No.1 R/B and Engine Room No.2 R/B Engine Room No.3 R/B Daytime Running Headlight Cleaner Light Relay No.4 Control Relay Daytime Running Light Relay No.3 Headlight Control Headlight Control ECU RH ECULH [Instrument Panel] Automatic Light...
- Page 22 [Body] (S/D) Wireless Door Lock Moon Roof Control ECU Navigation ECU Control Receiver Light Failure Sensor Luggage Compartment Door Opener Relay (W/G) Moon Roof Wireless Door Lock Power Outlet Back Door Opener Relay Control ECU Control Receiver Relay Light Failure Sensor Navigation ECU...
- Page 23 F RELAY LOCATIONS : Engine Room No.1 R/B Engine Compartment Right (See Page 20) : Engine Room No.2 R/B *1:15A H-LP L LWR *2:15A H-LP R LWR Engine Room No.1 R/B 60AABS1 (for High Current) 120AALT (for High Current) 30A H-LP CLN 30A RDI FAN (for Medium Current) (for Medium Current)
- Page 24 : Engine Room No.3 R/B Engine Compartment Left (See Page 20) FAN NO. 1 Relay FAN NO.2 Relay FAN NO.3 Relay -A/C COMP Relay -DIMMER Relay FUEL PMP Relay...
- Page 25 F RELAY LOCATIONS : Driver Side J/B Left Kick Panel (See Page 20) 40A RR DEF (for Medium Current) Body ECU 40A AMI (for Medium Current) (from Engine Room Main Wire) (from Engine Room (from Front Door LH Wire) Main Wire) (from Engine Room (from Instrument Panel Wire) Main Wire)
- Page 26 (Inner Circuit: See Page 28) Noise Filter Noise Filter (DEF CDS) (DEF CDS) DEICER Relay FLSH Relay TAIL Relay RR DEF Relay...
- Page 27 F RELAY LOCATIONS : Passenger Side J/B Right Kick Panel (See Page 20) 40A HEATER (for Medium Current) (from Engine Room (from Engine Room Main Wire) Main Wire) (from Engine Room Main Wire) (from Front Door RH Wire) (from Engine Room Main Wire) (from Instrument Panel Wire) GRAY (from Instrument Panel Wire)
- Page 28 (Inner Circuit: See Page 29) FR FOG Relay HTR Relay MIR HTR Relay Relay...
- Page 29 F RELAY LOCATIONS [Driver Side J/B Inner Circuit]...
- Page 30 [Passenger Side J/B Inner Circuit]...
- Page 31 G ELECTRICAL WIRING ROUTING Position of Parts in Engine Compartment *1:w/ VSC *2: w/o VSC A 1 A/C Ambient Temp. Sensor E 1 Electronically Controlled Transmission Solenoid A 2 A/C Condenser Fan Motor E 3 Engine Control Module A 3 A/C Magnetic Clutch and Lock Sensor E 4 Engine Control Module A 4 A/C Triple Pressure SW E 5 Engine Control Module...