Lexus GS300/400 (2000 year). Manual - part 78

BE–12

–

BODY ELECTRICAL

TROUBLESHOOTING

2313

The system does not operate when the ignition switch is turned to

ACC without using a key or transmitter.

1. Ignition Switch

2. Key Unlock Warning Switch

3. Transmitter

4. Wire Harness

5. Body No.1 ECU

BE–31

BE–31

BE–157

–

DI–776

Some of the system does not operate.

(Headlight does not light up.)

1. Headlight System

2. Wire Harness

3. Body No.2 ECU

4. Body No.1 ECU

BE–3

–

DI–820

DI–776

Some of the system does not operate.

(Taillight does not light up.)

1. Taillight System

2. Wire Harness

3. Body No.2 ECU

4. Body No.1 ECU

BE–3

–

DI–820

DI–776

Some of the system does not operate.

(Theft Deterrent Horn or Horn does not sound.)

1. HORN Fuse

2. Theft Deterrent Horn

3. Horn

4. Horn Relay

5. Wire Harness

6. Body No.1 ECU

BE–21

BE–150

BE–250

BE–250

–

DI–776

While the warning is given, the system cannot be canceled by

unlocking the door with key or transmitter.

1. Door Key Lock and Unlock Switch

2. Wire Harness

3. Body No.1 ECU

BE–131

–

DI–776

While the warning is given, the system cannot be canceled by

turning the ignition switch to ACC or ON with key.

1. Ignition Switch

2. Key Unlock Warning Switch

3. RAD NO.2 Fuse

4. ECU–IG Fuse

5. Wire Harness

6. Body No.2 ECU

7. Body No.1 ECU

BE–31

BE–31

BE–21

BE–21

–

DI–820

DI–776

The system operates for more than 60 seconds.

Body No.1 ECU

DI–776

WIRELESS DOOR LOCK CONTROL SYSTEM
This system uses the multiplex communication system, so check diagnosis system of the multiplex commu-
nication system before you proceed with troubleshooting.
HINT:



Troubleshooting of the wireless door lock control system is based on the premise that the door lock
control system is operating normally. Accordingly, before troubleshooting the wireless door lock control
system, first make certain that the door lock control system is operating normally.



If the trouble still reappears even though there are no abnormalities in any of the other circuits, then
check and replace the Wireless Door Lock Control Receiver as the last step.

Symptom

Suspect Area

See page

All functions of wireless door lock control system do not operate.

1. Transmitter

2. Wireless Door Lock Control Receiver

3. Wire Harness

4. Body No.1 ECU

BE–157

BE–157

–

DI–776

Wireless door lock operates, but the buzzer does not sound.

(The buzzer does not sound when the customize function prohib-

its.)

1. Wireless Door Lock Buzzer

2. Wireless Door Lock Control Receiver

3. Wire Harness

BE–157

BE–157

–

–

BODY ELECTRICAL

TROUBLESHOOTING

BE–13

2314

POWER SEAT CONTROL SYSTEM

Symptom

Suspect Area

See page

Both Driver and Passenger Power seats do not operate.

(Door lock does not operate.)

1. ALT M–Fuse

2. Wire Harness

BE–21

–

Driver’s seat does not operate.

1. P/SEAT (D) Fuse

2. Power Seat Switch (D)

3. Wire Harness

BE–21

BE–167

–

Passenger’s seat does not operate.

1. P/SEAT (P) Fuse

2. Power Seat Switch (P)

3. Wire Harness

BE–21

BE–167

–

”Slide operation” does not operate.

1. Power Seat Switch (D, P)

2. Wire Harness

3. Slide Motor (D, P)

BE–167

–

BE–167

”Front Vertical Operation” does not operate.

1. Power Seat Switch (D, P)

2. Wire Harness

3. Front Vertical Motor (D, P)

BE–167

–

BE–167

”Lifter Operation” does not operate.

1. Power Seat Switch (D, P)

2. Wire Harness

3. Lifter Motor (D, P)

BE–167

–

BE–167

”Reclining Operation” does not operate.

1. Power Seat Switch (D, P)

2. Wire Harness

3. Reclining Motor (D, P)

BE–167

–

BE–167

”Lumbar Support Operation” does not operate.

1. Power Seat Switch (D, P)

2. Wire Harness

3. Lumbar Support Motor (D, P)

BE–167

–

BE–167

(D): Driver’s Seat
(P): Passenger’s Seat
POWER MIRROR CONTROL SYSTEM
This system uses the multiplex communication system, so check diagnosis system of the multiplex commu-
nication system before you proceed with troubleshooting.

w/ Driving Position Memory System:

Symptom

Suspect Area

See page

Both right and left mirrors do not operate.

1. Mirror Switch

2. Wire Harness

3. Body No.2 ECU

BE–176

–

DI–820

Only one side of mirror does not operate.

1. Mirror Motor

2. Wire Harness

3. Driver and Passenger Door ECU

BE–176

–

DI–856

DI–889

The mirror does not return to the memorized position.

1. Mirror Position Sensor

(Position is not set)

2. Wire Harness

3. Power Seat Control ECU

BE–176

–

DI–683

The memorized position is moved.

1. Mirror Position Sensor

(Position is not set)

2. Wire Harness

BE–176

–

BE–14

–

BODY ELECTRICAL

TROUBLESHOOTING

2315

w/o Driving Position Memory System:

Symptom

Suspect Area

See page

Mirror does not operate.

1. Mirror Switch

2. Wire Harness

3. Body No.2 ECU

4. Driver and Passenger Door ECU

BE–176

–

DI–820

DI–856

DI–889

Mirror operates abnormally.

1. Mirror Switch

2. Mirror Motor

3. Wire Harness

4. Body No.2 ECU

5. Driver and Passenger Door ECU

BE–176

BE–176

–

DI–820

DI–856

DI–889

ELECTRO CHROMIC MIRROR SYSTEM

Symptom

Suspect Area

See page

Electro Chromic Inner Mirror does not operate.

1. ECU–IG Fuse

2. Electro Chromic Inner Mirror

3. Wire Harness

BE–21

BE–182

–

Electro Chromic Outer Mirror does not operate.

1. ECU–IG Fuse

2. Electro Chromic Outer Mirror

3. Electro Chromic Inner Mirror

4. Wire Harness

BE–21

BE–182

BE–182

–

SEAT HEATER SYSTEM

Symptom

Suspect Area

See page

Seat heaters do not operate.

(Driver’s and Passenger’s)

1. SEAT HTR Fuse

2. Seat Heater Switch (D, P)

3. Wire Harness

4. Seat Heater

BE–21

BE–185

–

BE–185

Driver’s seat heater does not operate.

1. Seat Heater Switch (D, P)

2. Wire Harness

BE–185

–

Passenger’s seat heater does not operate.

1. Seat Heater Switch (D, P)

2. Wire Harness

BE–185

–

Seat heater temperature is too hot.

Seat Heater

BE–185

FUEL LID OPENER SYSTEM

Symptom

Suspect Area

See page

Fuel lid opener system does not operate.

1. FUEL OPN Fuse

2. Fuel Lid Opener Switch

3. Fuel Lid Opener Motor

4. Wire Harness

BE–21

BE–188

BE–188

–

AUDIO SYSTEM

Symptom

Suspect Area

See page

Audio system abnormal operation.

TROUBLESHOOTINGS

BE–196

CLOCK SYSTEM

Symptom

Suspect Area

See page

Passenger seat belt warning system does not light up.

TROUBLESHOOTING NO.1

BE–227

Clock will not operate.

TROUBLESHOOTING NO.1

BE–227

Clock loses or gains time.

TROUBLESHOOTING NO.2

BE–227

–

BODY ELECTRICAL

TROUBLESHOOTING

BE–15

2316

GARAGE DOOR OPENER SYSTEM

Symptom

Suspect Area

See page

The equipment of which code has been registered does not oper-

ate.

1. Garage Door Opener Switch

2. Wire Harness

3. *

BE–235

–

–

LED does not light up. (Even though either switch is pressed.)

1. Garage Door Opener Switch

2. Wire Harness

BE–235

–

LED does not light up. (Only one switch is pressed.)

Garage Door Opener Switch

BE–235

* As the GARAGE DOOR OPENER on the vehicle side seems to be normal, check the OPENER on the
equipment side, of which code has been registered.
ENGINE IMMOBILIZER SYSTEM

Symptom

Suspect Area

See page

Engine immobilizer system does not operate.

See DIAGNOSIS SYSTEM

DI–726

HORN SYSTEM

Symptom

Suspect Area

See page

Horn system does not operate.

1. HORN Fuse

2. Horn Relay

3. Horn Switch

4. Horn

5. Wire Harness

BE–21

BE–250

BE–250

BE–250

–

Horns blow all the time.

1. Horn Relay

2. Horn Switch

3. Wire Harness

BE–250

BE–250

–

One horn operates but the other horn does not operate.

1. Horn

2. Wire Harness

BE–250

–

Horns operate abnormally.

1. Horn Relay

2. Horn

3. Wire Harness

BE–250

BE–250

–