Lexus LS400 (2000 year). Service manual - part 50

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BODY ELECTRICAL

TROUBLESHOOTING

BE–15

1878

”Front Vertical Operation” does not operate.

1. Power Seat Switch (D)

2. Power Seat Switch (P)

3. Wire Harness

4. Front Vertical Motor (D, P)

BE–172

BE–172

BE–172

”Rear Vertical Operation” does not operate.

1. Power Seat Switch (D)

2. Wire Harness 

3. Rear Vertical Motor (D, P)

BE–172

BE–172

”Reclining Operation” does not operate.

1. Power Seat Switch (D)

2. Power Seat Switch (P)

4. Wire Harness

4. Reclining Motor (D, P)

BE–172

BE–172

BE–172

”Lumbar Support Operation” does not operate.

1. Power Seat Switch (D, P)

2. Wire Harness

3. Lumbar Support Motor (D, P)

BE–172

BE–172

(D): Driver’s Seat
(P): Passenger’s Seat
w/ Memory System:
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.

Symptom

Suspect Area

See page

Both right and left mirror does not operate.

1. RADIO NO.2 Fuse (Instrument Panel J/B)

2. Mirror Switch

3. Tilt & Telescopic ECU

4. Multiplex Communication Circuit

5. Wire Harness

BE–183

DI–408

DI–838

Only one side of interior does not operate.

1. Driver Door ECU (Left Side Mirror)

2. Front Passenger Door ECU (Right Side Mirror)

3. Mirror Motor

4. Wire Harness

DI–727

DI–760

BE–183

The mirror does not return to the memorized position.

1. Driving Position Memory

(Position is not set)

2. Driving Position Switch

3. Driver Door ECU

4. Multiplex Communication Circuit

5. Wire Harness

BE–183

BE–183

DI–727

DI–838

The memorized position is moved.

1. Driving Position Memory

(Position is not set)

2. Wire Harness

DI–727

w/o Memory System:
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.

Symptom

Suspect Area

See page

Mirror does not operate.

1. RADIO NO.2 Fuse (Instrument Panel J/B)

2. Mirror Switch

3. Mirror Motor

4. Wire Harness

DI–727

DI–727

Mirror operates abnormally.

1. Mirror Switch

2. Mirror Motor

3. Wire Harness

DI–727

DI–727

BE–16

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BODY ELECTRICAL

TROUBLESHOOTING

1879

POWER SHOULDER BELT ANCHORAGE SYSTEM
This system uses the multiplex communication system, so check diagnosis system of the multiplex commu-
nication system before you proceed with troubleshooting.

Symptom

Suspect Area

See page

Driver’s belt anchor can not be operated manually.

1. Shoulder Belt Adjust Switch (Driver’s)

2. Driver Door ECU

3. Multiplex Communication Circuit

4. Tilt and Telescopic ECU

5. Height Adjustable Anchor Motor

6. Wire Harness

BE–188

DI–727

DI–838

DI–408

BE–188

The anchor does not return to the memorized position.

1. Driving Position Memory and Return Switch

2. Driver Door ECU

3. Multiplex Communication Circuit

4. Tilt and Telescopic ECU

5. Wire Harness

BE–188

DI–727

DI–838

DI–408

The memorized position is moved.

1. Height Adjustable Anchor Sensor

BE–188

Passenger’s belt anchor can not be operated manually.

1. Shoulder Belt Adjust Switch (Passenger’s)

2. Shoulder Belt Anchor Relay

3. Wire Harness

4. Height Adjustable Anchor Motor

BE–188

BE–188

BE–188

ELECTRO CHROMIC MIRROR SYSTEM

Symptom

Suspect Area

See page

Electro Chromic Inner Mirror does not operate.

1. ECU–IG Fuse (Instrument Panel J/B)

2. Elector Chromic Inner Mirror

3. Wire Harness

BE–195

Electro Chromic Outer Mirror does not operate.

1. ECU–IG Fuse (Instrument Panel J/B)

2. Electro Chromic Outer Mirror

3. Elector Chromic Inner Mirror

4. Wire Harness

BE–195

BE–195

SEAT HEATER SYSTEM

Symptom

Suspect Area

See page

Seat heaters do not operate.

(Driver’s and Passenger’s)

1. FR S/HTR Fuse (Engine Room J/B)

2. Engine Main Relay (Engine Room J/B)

3. Seat Heater Switch

4. Wire Harness

5. Seat Heater

BE–198

BE–198

BE–198

Driver’s seat heater does not operate.

1. Seat Heater Switch

2. Wire Harness

BE–198

Passenger’s seat heater does not operate.

1. Seat Heater Switch

2. Wire Harness

BE–198

Seat heater temperature is too hot.

1. Seat Heater

BE–198

FUEL LID OPENER SYSTEM

Symptom

Suspect Area

See page

Fuel lid opener system does not operate.

1. FUEL OPN Fuse (Instrument Panel J/B)

2. Fuel Lid Opener Switch

3. Fuel Lid Opener Solenoid

4. Wire Harness

BE–202

BE–202

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BODY ELECTRICAL

TROUBLESHOOTING

BE–17

1880

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

2. Wire Harness

3. *

BE–242

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

1. Garage Door Opener

2. Wire Harness

BE–242

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

1. Garage Door Opener

BE–242

* 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.
HORN SYSTEM

Symptom

Suspect Area

See page

Horn system does not operate.

1. HORN Fuse (Engine Room J/B)

2. Horn Relay (Engine Room J/B)

3. Horn Switch

4. Horn

5. Wire Harness

BE–257

BE–257

BE–257

Horns blow all the time.

1. Horn Relay (Engine Room J/B)

2. Horn Switch

3. Wire Harness

BE–257

BE–257

One horn operates but other horn does not operate.

1. Horn

2. Wire Harness

BE–257

Horns operate abnormally.

1. Horn Relay (Engine Room J/B)

2. Horn

3. Wire Harness

BE–257

BE–257

BE0B9–01

I03227

Instrument Panel Junction Block

 RR CIG Fuse

Power Outlet

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BODY ELECTRICAL

POWER OUTLET

BE–31

1894

POWER OUTLET

LOCATION