Lexus LS400 (2000 year). Manual - part 47

 

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Lexus LS400 (2000 year). Manual - part 47

 

 

BE0DD–04

–

BODY ELECTRICAL

TROUBLESHOOTING

BE–3

1866

TROUBLESHOOTING

PROBLEM SYMPTOMS TABLE

The table below will be useful for you in troubleshooting these electrical problems. The most likely causes
of the malfunction are shown in the order of their probability. Inspect each part in the order shown, and re-
place the part when it is found to be faulty.
POWER OUTLET

Symptom

Suspect Area

See page

Electric power source cannot be taken out of the power outlet

1. Battery

2. RR CIG Fuse (Instrument panel J/B)

3. Wire Harness

IGNITION SWITCH:
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

Ignition switch is not set to each position.

1. Ignition switch

2. Power source circuit

BE–33

BE–23

KEY UNLOCK WARNING SWITCH:
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

Key unlock warning system does not operate.

(The buzzer does not sound when the driver’s door is opened with

the ignition OFF and key inserted)

1. Key Unlock Warning Switch

2. Door Courtesy Switch

3. Driver Door ECU

4. Multiplex Communication Circuit

5. Body ECU

6. Wire Harness

BE–33

BE–70

DI–727

DI–838

DI–661

Key unlock warning system does not operate.

(The buzzer sounds when the ignition key is ACC or ON)

1. Ignition Switch

2. RADIO No.2 Fuse (Instrument Panel J/B)

3. GAUGE Fuse (Instrument Panel J/B)

4. Wire Harness

BE–33

HEADLIGHT AND TAILLIGHT SYSTEM:
This system uses the multiplex communication system, so check diagnosis system of the multiplex commu-
nication system before you proceed with troubleshooting.
HINT:
To inspect the bulb and light control ECU, replace them with the ones working normally and judge whether
they work normally or not.
(AUTOMATIC LIGHT CONTROL SYSTEM)

Symptom

Suspect Area

See page

”Automatic light control system” does not operate.

1. ECU–IG Fuse (Instrument Panel J/B)

2. DOME Fuse (Engine Room J/B)

3. Automatic Light Control Sensor

4. Light Control Switch

5. Door Courtesy Switch

6. Body ECU

7. Driver Door ECU

8. Wire Harness

BE–38

BE–38

BE–70

DI–661

DI–727

BE–4

–

BODY ELECTRICAL

TROUBLESHOOTING

1867

(AUTO TURN OFF SYSTEM)

Symptom

Suspect Area

See page

Auto turn–off system does not operate when the driver’s door is

opened.

1. Drivers Door Courtesy Switch

2. Driver Door ECU

3. Multiplex Communication Circuit

4. Body ECU

BE–70

DI–727

DI–838

DI–661

Headlight and taillight does not come on.

1. Body ECU

2. Wire Harness

DI–661

Headlight and taillight stays on.

1. Body ECU

2. Wire Harness

DI–661

(USA)

Symptom

Suspect Area

See page

Only one headlight comes on.

(Headlight main)

1. H–LP Fuse (LH–LWR) (Engine Room No.1 R/B)

2. H–LP Fuse (RH–LWR) (Engine Room No.1 R/B)

3. Headlight Main Bulb

4. *Light Control ECU

5. Wire Harness

BE–38

Only one headlight comes on.

(Headlight sub)

1. H–LP Fuse (LH–UPR) (Engine Room J/B)

2. H–LP Fuse (RH–UPR) (Engine Room J/B)

3. Headlight Sub Bulb

4. *Light Control ECU

5. Wire Harness

BE–38

”LO–Beam” does not light.

1. H–LP Fuse (LH–LWR) (Engine Room No.1 R/B)

2. H–LP Fuse (RH–LWR) (Engine Room No.1 R/B)

3. Headlight Dimmer Relay (Engine Room J/B)

4. Headlight Dimmer Switch

5. Headlight Main Bulb

6. *Light Control ECU

7. Wire Harness

BE–38

BE–38

BE–38

”HI–Beam” does not light.

(Headlight main and sub)

1. H–LP Fuse (LH–UPR) (Engine Room J/B)

2. H–LP Fuse (RH–UPR) (Engine Room J/B)

3. Headlight Dimmer Relay (Engine Room J/B)

4. Headlight Dimmer Switch

5. *Light Control ECU

6. Wire Harness

BE–38

BE–38

BE–38

”HI–Beam” does not light.

(Headlight main or sub)

1. Headlight Main or Sub Bulb

2. *Light Control ECU

3. Wire Harness

BE–38

”Flash” does not light.

(Headlight main and sub)

1. H–LP Fuse (LH–UPR) (Engine Room J/B)

2. H–LP Fuse (RH–UPR) (Engine Room J/B)

3. Headlight Dimmer Relay (Engine Room J/B)

4. Headlight Dimmer Switch

5. *Light Control ECU

6. Wire Harness

BE–38

BE–38

BE–38

”Flash” does not light.

(Headlight main or sub)

1. Headlight Main or Sub Bulb

2. *Light Control ECU

3. Wire Harness

BE–38

Headlight does not come on.

(Headlight main and sub)

1. Headlight Control Relay (Engine Room J/B)

2. Headlight Dimmer Relay (Engine Room J/B)

3. Light Control Switch

4. Body ECU

5. *Light Control ECU

6. Wire Harness

BE–38

BE–38

BE–38

DI–661

BE–38

–

BODY ELECTRICAL

TROUBLESHOOTING

BE–5

1868

Headlight does not come on.

(Headlight main or sub)

1. Headlight Main or Sub

2. *Light Control ECU

3. Wire Harness

BE–38

Headlight is flicker.

1. Headlight Main or Sub Bulb

2. Headlight Dimmer Relay (Engine Room J/B)

3. *Light Control ECU

4. Wire Harness

BE–38

BE–38

Headlight is dark.

1. Headlight Main or Sub Bulb

2. *Light control ECU

3. Wire Harness

BE–38

Only one taillight comes on.

1. Taillight Bulb

2. Wire Harness

Taillight does not come on.

(Headlight is normal)

1. TAIL Fuse (Instrument Panel J/B)

2. GAUGE Fuse (Instrument Panel J/B)

3. Taillight Control Relay (Instrument Panel J/B)

4. Light Failure Sensor

5. Light Control Switch

6. Body ECU

7. Wire Harness

BE–38

BE–76

BE–38

DI–661

Taillight does not come on.

(Headlight does not light)

1. Light Control Switch

2. Wire Harness

BE–38

Rear combination light does not come on.

1. Light Failure Sensor

2. Wire Harness

3. Bulb

BE–76

*: HID Type
CANADA:

Symptom

Suspect Area

See page

Only one headlight comes on.

(Headlight main)

1. H–LP Fuse (LH) (Engine Room R/B No.1)

2. H–LP Fuse (RH) (Engine Room R/B No.1)

3. Headlight Main Bulb

4. *Light Control ECU

5. Wire Harness

BE–38

Only one headlight comes on.

(Headlight sub RH)

1. H–LP Fuse (LH–UPR) (Engine Room J/B)

2. H–LP Fuse (RH–UPR) (Engine Room J/B)

3. Daytime Running Light No.3 Relay

4. Headlight Sub Bulb

5. *Light Control ECU

6. Wire Harness

BE–38

BE–38

Only one headlight comes on.

(Headlight sub LH)

1. H–LP Fuse (LH–UPR) (Engine Room J/B)

2. H–LP Fuse (RH–UPR) (Engine Room J/B)

3. Headlight Sub Bulb

4. *Light Control ECU

5. Wire Harness

BE–38

”LO–Beam” does not light (All).

(Headlight main)

1. Headlight Dimmer Switch

2. *Light Control ECU

3. Wire Harness

BE–38

BE–38

”LO–Beam” does not light (One side).

(Headlight main)

1. Headlight Main Bulb

2. *Light Control ECU

3. Wire Harness

BE–38

”HI–Beam” does not light (All).

(Headlight main)

1. Headlight Dimmer Switch

2. *Light Control ECU

3. Wire Harness

BE–38

BE–38

BE–6

–

BODY ELECTRICAL

TROUBLESHOOTING

1869

”HI–Beam” does not light (One side).

(Headlight main)

1. Headlight Main Bulb

2. *Light Control ECU

3. Wire Harness

BE–38

”Flash” does not light.

(Headlight main)

1. Headlight Dimmer Switch

2. *Light Control ECU

3. Wire Harness

BE–38

BE–38

Headlight does not come on.

(Headlight main)

1. Headlight Control Relay (Engine Room J/B)

2. Daytime Running Light Relay

3. Headlight Dimmer Switch

4. Light Control Switch

5. Body ECU

6. Wire Harness

7. *Light Control ECU

8. Headlight Main Bulb

BE–38

BE–38

BE–38

BE–38

DI–661

BE–38

Headlight does not come on.

(Headlight sub)

1. Headlight Dimmer Relay (Engine Room J/B)

2. Daytime Running Light Relay

3. Daytime Running Light No.4 Relay

4. *Light Control ECU

5. Wire Harness

BE–38

BE–38

BE–38

BE–38

Headlight does not come on with light control switch in HEAD.

(Headlight main)

1. Light Control Switch

2. Body ECU

3. *Light Control ECU

4. Wire Harness

BE–38

DI–661

BE–38

Headlight does not go out with light control switch in OFF.

(Headlight main

1. Headlight Control Relay (Engine Room J/B)

2. *Light Control ECU

3. Wire Harness

BE–38

BE–38

Headlight is flicker.

1. Headlight Main or sub Bulb

2. Headlight Dimmer Relay (Engine Room J/B)

3. *Light Control ECU

4. Wire Harness

BE–38

BE–38

Headlight is dark.

1. Headlight Main or Sub Bulb

2. *Light control ECU

3. Wire Harness

BE–38

Taillight does not come on with light control switch in TAIL.

(Headlight main)

1. Taillight Control Relay (Instrument Panel J/B)

2. Light Control Switch

3. Wire Harness

BE–38

BE–38

Taillight does not go out with light control switch in OFF.

(Headlight main)

1. Taillight Control Relay (Instrument Panel J/B)

2. Light Control Switch

3. Wire Harness

BE–38

BE–38

Headlight do not come on with engine running and light control

switch in OFF.

(Headlight main)

1. ECU–B Fuse (Engine Room J/B)

2. GAUGE Fuse (Instrument Panel J/B)

3. DRL Fuse (Engine Room R/B No.1)

4. Daytime Running Light Relay

5. Daytime Running Light No.3 and No.4 Relay

6. Body ECU

7. Generator L Terminal

8. Parking Brake Switch

9. Brake Fluid Level Warning Switch

10. *Light Control ECU

11. Wire Harness

BE–38

BE–38

DI–661

BE–98

BE–98

BE–38

*: HID Type

 

 

 

 

 

 

 

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