Lexus GS300/400 (2000 year). Service manual — part 78
BE–12
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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
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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
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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
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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
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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
–
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
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The system operates for more than 60 seconds.
Body No.1 ECU
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
–
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
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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
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Driver’s seat does not operate.
1. P/SEAT (D) Fuse
2. Power Seat Switch (D)
3. Wire Harness
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Passenger’s seat does not operate.
1. P/SEAT (P) Fuse
2. Power Seat Switch (P)
3. Wire Harness
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”Slide operation” does not operate.
1. Power Seat Switch (D, P)
2. Wire Harness
3. Slide Motor (D, P)
–
”Front Vertical Operation” does not operate.
1. Power Seat Switch (D, P)
2. Wire Harness
3. Front Vertical Motor (D, P)
–
”Lifter Operation” does not operate.
1. Power Seat Switch (D, P)
2. Wire Harness
3. Lifter Motor (D, P)
–
”Reclining Operation” does not operate.
1. Power Seat Switch (D, P)
2. Wire Harness
3. Reclining Motor (D, P)
–
”Lumbar Support Operation” does not operate.
1. Power Seat Switch (D, P)
2. Wire Harness
3. Lumbar Support Motor (D, P)
–
(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
–
Only one side of mirror does not operate.
1. Mirror Motor
2. Wire Harness
3. Driver and Passenger Door ECU
–
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
–
The memorized position is moved.
1. Mirror Position Sensor
(Position is not set)
2. Wire Harness
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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
–
Mirror operates abnormally.
1. Mirror Switch
2. Mirror Motor
3. Wire Harness
4. Body No.2 ECU
5. Driver and Passenger Door ECU
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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
–
Electro Chromic Outer Mirror does not operate.
1. ECU–IG Fuse
2. Electro Chromic Outer Mirror
3. Electro Chromic Inner Mirror
4. Wire Harness
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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
–
Driver’s seat heater does not operate.
1. Seat Heater Switch (D, P)
2. Wire Harness
–
Passenger’s seat heater does not operate.
1. Seat Heater Switch (D, P)
2. Wire Harness
–
Seat heater temperature is too hot.
Seat Heater
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
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AUDIO SYSTEM
Symptom
Suspect Area
See page
Audio system abnormal operation.
TROUBLESHOOTINGS
CLOCK SYSTEM
Symptom
Suspect Area
See page
Passenger seat belt warning system does not light up.
TROUBLESHOOTING NO.1
Clock will not operate.
TROUBLESHOOTING NO.1
Clock loses or gains time.
TROUBLESHOOTING NO.2
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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. *
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–
LED does not light up. (Even though either switch is pressed.)
1. Garage Door Opener Switch
2. Wire Harness
–
LED does not light up. (Only one switch is pressed.)
Garage Door Opener Switch
* 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
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
–
Horns blow all the time.
1. Horn Relay
2. Horn Switch
3. Wire Harness
–
One horn operates but the other horn does not operate.
1. Horn
2. Wire Harness
–
Horns operate abnormally.
1. Horn Relay
2. Horn
3. Wire Harness
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