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= 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.

1

2004

 IS 300

ELECTRICAL

 WIRING DIAGRAM

INTRODUCTION ................................................. A

HOW TO USE THIS MANUAL .......................... B

TROUBLESHOOTING ....................................... C

ABBREVIATIONS ............................................. D

GLOSSARY OF TERMS AND SYMBOLS ........ E

RELAY LOCATIONS ............................................ F

ELECTRICAL WIRING ROUTING .................... G

SYSTEM CIRCUITS ........................................... H

GROUND POINT .............................................. I

POWER SOURCE (Current Flow Chart) ......... J

CONNECTOR LIST ............................................ K

PART NUMBER OF CONNECTORS ................. L

OVERALL ELECTRICAL WIRING DIAGRAM . M

Section Code Page

Summary of Contents for JCE10

Page 1: ...ir Manual Volume 1 Volume 2 2003 LEXUS New Car Features Pub No RM1054U1 RM1054U2 NCF259U 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 fo...

Page 2: ...oration 1 2004 IS 300 ELECTRICAL WIRING DIAGRAM INTRODUCTION A HOW TO USE THIS MANUAL B TROUBLESHOOTING C ABBREVIATIONS D GLOSSARY OF TERMS AND SYMBOLS E RELAY LOCATIONS F ELECTRICAL WIRING ROUTING G SYSTEM CIRCUITS H GROUND POINT I POWER SOURCE Current Flow Chart J CONNECTOR LIST K PART NUMBER OF CONNECTORS L OVERALL ELECTRICAL WIRING DIAGRAM M Section Code Page ...

Page 3: ...tc This section is closely related to the system circuit Describes position of Parts Connectors Splice points Ground points etc This section is closely related to the system circuit Index of the system circuits Electrical circuits of each system are shown from the power supply through ground points Wiring connections and their positions are shown and classified by code according to the connection ...

Page 4: ...wer Source section and the ground points see Ground Point section See the System Outline to understand the circuit operation When the circuit operation is understood begin troubleshooting of the problem circuit to isolate the cause Use Relay Location and Electrical Wiring Routing sections to find each part junction block and wiring harness connectors wiring harness and wiring harness connectors sp...

Page 5: ... The system shown here is an EXAMPLE ONLY It is different to the actual circuit shown in the SYSTEM CIRCUITS SECTION 4 B HOW TO USE THIS MANUAL ...

Page 6: ...de it Junction Blocks are shaded to clearly separate them from other parts Example 3C indicates that it is inside Junction Block No 3 H When 2 parts both use one connector in common the parts connector name used in the wire routing section is shown in square brackets L L Y Blue Yellow J Indicates a wiring Splice Point Codes are E for the Engine Room I for the Instrument Panel and B for the Body Ex...

Page 7: ...ning circuit on and holds the warning light on until the ignition SW is turned off S6 STOP LIGHT SW 2 1 Closed with the brake pedal depressed L4 LIGHT FAILURE SENSOR 1 2 7 GROUND Approx 12 volts with the stop light SW on 4 8 GROUND Approx 12 volts with the ignition SW at ON position 11 GROUND Always continuity Code C7 H17 See Page 34 36 Code L4 R6 See Page 36 37 Code R7 S6 See Page 37 35 Code 1 Se...

Page 8: ... and Wire Harness in the system circuit Example Connector 3C connects the Instrument Panel Wire and J B No 3 It is described on page 22 of this manual and is installed on the instrument panel left side T Indicates the reference page describing the wiring harness and wiring harness connector the female wiring harness is shown first followed by the male wiring harness Example Connector IE1 connects ...

Page 9: ...shooting a faulty ground point checking the system circuits which use a common ground may help you identify the problem ground quickly The relationship between ground points shown below can also be checked this way I GROUND POINT The system shown here is an EXAMPLE ONLY It is different to the actual circuit shown in the SYSTEM CIRCUITS SECTION 8 ...

Page 10: ...ce all System Circuit diagrams start from the power source the power source system must be fully understood J POWER SOURCE Current Flow Chart The chart below shows the route by which current flows from the battery to each electrical source Fusible Link Circuit Breaker Fuse etc and other parts POWER SOURCE The system shown here is an EXAMPLE ONLY It is different to the actual circuit shown in the S...

Page 11: ...installed When installing the wire harnesses the harnesses can be connected to any position within the short terminal grouping Accordingly in other vehicles the same position in the short terminal may be connected to a wire harness from a different part Wire harness sharing the same short terminal grouping have the same color Same Color Short Terminal C Parts Code The first letter of the code is t...

Page 12: ...B 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 11 ...

Page 13: ...light instead of a voltmeter CONTINUITY AND RESISTANCE CHECK a Disconnect the battery terminal or wire so there is no voltage between the check points b Contact the two leads of an ohmmeter to each of the check points If the circuit has diodes reverse the two leads and check again When contacting the negative lead to the diode positive side and the positive lead to the negative side there should b...

Page 14: ...d the exact location of the short by lightly shaking the problem wire along the body CAUTION a Do not open the cover or the case of the ECU unless absolutely necessary If the IC terminals are touched the IC may be destroyed by static electricity b When replacing the internal mechanism ECU part of the digital meter be careful that no part of your body or clothing comes in contact with the terminals...

Page 15: ...OR 3 DISENGAGE THE SECONDARY LOCKING DEVICE OR TERMINAL RETAINER a Locking device must be disengaged before the terminal locking clip can be released and the terminal removed from the connector b Use a special tool or the terminal pick to unlock the secondary locking device or terminal retainer NOTICE Do not remove the terminal retainer from connector body A For Non Waterproof Type Connector HINT ...

Page 16: ...l retainer is pulled up to the temporary lock position Pull Type Insert the special tool into the terminal retainer access hole Mark and pull the terminal retainer up to the temporary lock position HINT The needle insertion position varies according to the connector s shape Number of terminals etc so check the position before inserting it Case 2 Type which cannot be pulled as far as Power Lock ins...

Page 17: ...erminal and pull the terminal out from rear 4 INSTALL TERMINAL TO CONNECTOR a Insert the terminal HINT 1 Make sure the terminal is positioned correctly 2 Insert the terminal until the locking lug locks firmly 3 Insert the terminal with terminal retainer in the temporary lock position b Push the secondary locking device or terminal retainer in to the full lock position 5 CONNECT CONNECTOR 16 ...

Page 18: ...tronic Spark Advance Electronic Throttle Control System intelligent Evaporative Emission Flexible Flat Circuit Integrated Circuit Junction Block Liquid Crystal Display Light Emitting Diode Left Hand Multiplex Overdrive Relay Block Right Hand Sedan Type Sequential Multiport Fuel Injection Supplemental Restraint System Switch Temperature Traction Control Vehicle Stability Control Vacuum Switching Va...

Page 19: ...locks reverse flow only up to a specific voltage Above that potential it passes the excess voltage This acts as a simple voltage regulator LIGHT Current flow through a filament causes the filament to heat up and emit light PHOTODIODE The photodiode is a semiconductor which controls the current flow according to the amount of light LED LIGHT EMITTING DIODE Upon current flow these diodes emit light ...

Page 20: ...entiometer or rheostat SWITCH IGNITION A key operated switch with several positions which allows various circuits particularly the primary ignition circuit to become operational SENSOR Thermistor A resistor which varies its resistance with temperature SWITCH WIPER PARK Automatically returns wipers to the stop position when the wiper switch is turned off Reed Switch Type SENSOR SPEED Uses magnetic ...

Page 21: ...strument Panel Skid Control ECU Automatic Light Control Sensor Headlight Control ECULH Transponder Key Amplifier A C Control Assembly Engine Room No 3 R B Headlight Cleaner Control Relay Theft Deterrent ECU Body ECU Stereo Component Amplifier Passenger Side J B Shift Lock Control ECU Driver Side J B Headlight Beam Daytime Running Center Airbag Level Control ECU Light Relay Main Sensor Assembly 20 ...

Page 22: ...Door Lock Control Receiver Navigation ECU W G Back Door Opener Relay Light Failure Sensor Moon Roof Control ECU Luggage Compartment Door Opener Relay Wireless Door Lock Control Receiver Power Outlet Relay Light Failure Sensor Navigation ECU 21 ...

Page 23: ...AIN for Medium Current HEAD LP Relay STARTER Relay 1 15A H LP L LWR 2 15A H LP R LWR Engine Room No 1 R B 30ARDIFAN for Medium Current 30ACDSFAN for Medium Current Engine Room No 2 R B ABS SOL Relay CIRCUIT OPENING Relay ABS MTR Relay HORN Relay EFI Relay Engine Room No 1 R B Engine Room No 2 R B 22 Engine Compartment Right See Page 20 ...

Page 24: ... Engine Room No 3 R B Engine Compartment Left See Page 20 FAN NO 3 Relay FAN NO 1 Relay FAN NO 2 Relay A C COMP Relay DIMMER Relay FUEL PMP Relay 23 ...

Page 25: ...rent from Engine Room Main Wire from Engine Room Main Wire from Front Door LH Wire from Engine Room Main Wire from Instrument Panel Wire 1H from Instrument Panel Wire from Instrument Panel Wire from Instrument Panel Wire from Floor No 2 Wire from Instrument from Instrument Panel Wire Panel Wire from Instrument Panel Wire 24 ...

Page 26: ... Inner Circuit See Page 28 Noise Filter DEF CDS DEICER Relay TAIL Relay Noise Filter DEF CDS FLSH Relay RR DEF Relay 25 ...

Page 27: ...ain Wire 40A HEATER for Medium Current from Engine Room Main Wire from Front Door RH Wire from Instrument Panel Wire from Engine Room Main Wire GRAY from Instrument Panel Wire from Instrument Panel Wire from Instrument Panel Wire from Instrument Panel Wire from Instrument Panel Wire from Instrument Panel Wire 26 ...

Page 28: ... Inner Circuit See Page 29 FR FOG Relay HTR Relay MIR HTR Relay P W Relay 27 F ...

Page 29: ...F RELAY LOCATIONS Driver Side J B Inner Circuit 28 ...

Page 30: ...29 Passenger Side J B Inner Circuit F ...

Page 31: ...ime Running Light Relay No 3 D 3 Daytime Running Light Relay No 4 D 4 Daytime Running Light Resistor F 1 Front Fog Light LH F 2 Front Fog Light RH F 3 Front Parking Light LH F 4 Front Parking Light RH F 5 Front Side Marker Light LH F 6 Front Side Marker Light RH F 7 Front Side Turn Signal Light LH F 8 Front Side Turn Signal Light RH F 9 Front Turn Signal Light LH F 10 Front Turn Signal Light RH F ...

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