Lexus LS400 (2000 year). Manual — part 49

DI–305

TRAC warning light does not light up.

1. GAUGE Fuse

2. Bulb

3. Meter Circuit Plate

4. Wire Harness

5. ABS, TRAC and VSC ECU

DI–364

AIRSUS warning light does not light up.

1. Bulb

2. Meter Circuit Plate

3. Wire Harness

4. Suspension ECU

IN–32

Malfunction indicator light does not light up.

1. Bulb

2. Meter Circuit Plate

3. Wire Harness

4. ECM

Fuel level warning light does not light up.

1. Bulb

2. Fuel level warning switch

3. Meter Circuit Plate

4. Wire Harness

BE–98

ELECTRIC TENSION REDUCER SYSTEM

Symptom

Suspect Area

See page

Tension Reducer does not operate.

(Driver’s and Passenger’s)

1. PWR–IG Fuse (Instrument Panel J/B)

2. Wire Harness

Tension Reducer does not operate.

(Only one side)

1. Buckle Switch

2. Tension Reducer Solenoid

3. Wire Harness

BE–113

DEFOGGER SYSTEM

Symptom

Suspect Area

See page

All defogger systems do not operate.

1. HTR Fuse (Instrument Panel J/B)

2. DEF H–Fuse (Engine Room J/B)

3. Defogger Switch

4. Defogger Relay (Engine Room J/B)

5. Wire Harness

BE–116

Rear window defogger does not operate.

1. Defogger Wire

2. Wire Harness

BE–116

Mirror defogger does not operate.

1. MIR–HTR Fuse (Engine Room J/B)

2. Mirror Defogger

3. Wire Harness

BE–116

POWER WINDOW 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

All the power windows do not operate.

(Power Door Lock System is normal.)

1. Power Window Master Switch

2. Wire Harness

BE–126

Only the driver’s window does not operate.

1. Power Window Master Switch

2. Power WIndow Switch

3. Power Window Motor

4. Wire Harness

BE–126

”Window lock function” does not operate.

1. Power Window Master Switch

BE–126

BE–12

–

BODY ELECTRICAL

TROUBLESHOOTING

1875

Window does not operate with power window master switch.

(Manual or Automatic operation can be performed.)

TROUBLESHOOTING NO.1

Remove control of all windows (Except driver’s) does not func-

tions with master switch.

(Window operate normally with each of master switch.)

TROUBLESHOOTING NO.2

The Key related power window operations does not operate with

driver side door key cylinder.

(Master switch operation is normal.)

TROUBLESHOOTING NO.3

Power window does not operate with multi–function transmitter.

(Windows operate normally with master switch.)

TROUBLESHOOTING NO.4

Window moves down without being ordered during the up opera-

tion.

TROUBLESHOOTING NO.5

POWER 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.

Symptom

Suspect Area

See page

All the doors cannot be locked or unlocked.

1. Door Lock Control Switch

2. Driver Door ECU

3. Front Passenger Door ECU

4. Multiplex Communication Circuit

5. Body ECU

6. Wire Harness

Only driver’s side door lock control does not operate.

1. Driver Door ECU

2. Driver’s Door Lock Motor

3. Wire Harness

DI–727

BE–139

Other doors than the driver’s side door do not operate.

1. Driver Door ECU

2. Multiplex Communication Circuit

3. Body ECU

4. Wire Harness

5. Door Lock Motor

Door key related function does not operate.

1. Door Key Lock and Unlock Switch

2. Wire Harness

BE–139

Key confinement prevention function does not operate.

1. Key Unlock Warning Switch

2. Wire Harness

3. Body ECU

Luggage compartment door opener function does not operate.

1. Luggage Compartment Door Opener Switch

2. Luggage Compartment Door Key Lock and

Unlock Switch

3. Luggage Compartment Door Opener Motor

4. Wire Harness

5. Body ECU

BE–139

–

BODY ELECTRICAL

TROUBLESHOOTING

BE–13

1876

THEFT DETERRENT 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

The system cannot be set.

1. Indicator Light

2. Key Unlock Warning Switch

3. Door Unlock Detection Switch

4. Engine Hood Courtesy Switch

5. Luggage Room Door Courtesy Switch

6. Wire Harness

7. Body ECU

8. Driver Door ECU

9. Multiplex Communication Circuit

10. Transmitter

The system cannot be canceled when the ignition switch is turned

to ACC with key.

1. Key Unlock Warning Switch

2. Ignition Switch

3. Body ECU

4. RADIO NO.2 Fuse (Instrument panel J/B)

5. Wire Harness

The system cannot be canceled when the luggage compartment

door is unlocked with key.

1. Luggage Room Door Courtesy Switch

2. Body ECU

3. Wire Harness

BE–70

The system does not operate when the engine hood is opened.

1. Engine Hood Courtesy Switch

2. Body ECU

3. Wire Harness

BE–151

The system does not operate when the door is opened or un-

locked without using a key or transmitter.

1. Door Courtesy Switch

2. Driver Door ECU

3. Front Passenger Door ECU

4. Body ECU

5. Multiplex Communication Circuit

6. Door Unlock Detection Switch

7. Wire Harness

8. Transmitter

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. Body ECU

4. Wire Harness

5. Transmitter

Some of the does not operate.

(Headlight does not light up)

1. Headlight System

2. Wire Harness

3. Body ECU

BE–36

Some of the system does not operate.

(Taillight does not light up)

1. Taillight System

2. Wire Harness

3. Body ECU

BE–36

Some of the system does not operate.

(Theft deterrent horn or horn does not sound)

1. Theft Deterrent Horn

2. Horn

3. Horn Relay

4. HORN Fuse (Engine Room J/B)

5. Wire Harness

6. Body ECU

BE–151

BE–257

BE–14

–

BODY ELECTRICAL

TROUBLESHOOTING

1877

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. Body ECU

3. Wire Harness

4. Driver Door ECU

5. Front Passenger Door ECU

6. Multiplex Communication Circuit

7. Transmitter

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

turning the ignition switch to ON with key.

1. Ignition Switch

2. Key Unlock Warning Switch

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

4. GAUGE Fuse (Instrument Panel J/B)

5. Body ECU

6. Wire Harness

The system operates for more then 60 seconds.

1. Body 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.

Whole wireless door lock control system does not operate.

Problem occurs only at a specific locality

→

Precheck type I (See page

BE–154

)

Problem occurs everywhere

→

Precheck type II (See page

BE–154

)

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

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. Wireless Door Lock Control Receiver

2. Wire Harness

BE–161

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

1. Wireless Door Lock Buzzer

2. Wireless Door Lock Control Receiver

3. Wire Harness

BE–161

POWER SEAT CONTROL SYSTEM

Symptom

Suspect Area

See page

Power seat does not operate.

(Door lock does not operate.)

1. Wire Harness

2. Power Seat Switch (D)

3. Power Seat Switch (P)

Power seat does not operate.

(Door lock is normal.)

1. Wire Harness

2. Power Seat Switch (D)

3. Power Seat Switch (P)

Driver’s seat does not operate.

1. Power Seat Switch (D)

2. Wire Harness

Passenger’s seat does not operate.

1. Power Seat Switch (P)

2. Wire Harness

”Slide operation” does not operate.

1. Power Seat Switch (D)

2. Power Seat Switch (P)

3. Wire Harness

4. Slide Motor (D, P)