Lexus LS400 (2000 year). Service manual — part 47
BE0DD–04
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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
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
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
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–4
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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
Headlight and taillight does not come on.
1. Body ECU
2. Wire Harness
Headlight and taillight stays on.
1. Body ECU
2. Wire Harness
(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
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
”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
”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
”HI–Beam” does not light.
(Headlight main or sub)
1. Headlight Main or Sub Bulb
2. *Light Control ECU
3. Wire Harness
”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
”Flash” does not light.
(Headlight main or sub)
1. Headlight Main or Sub Bulb
2. *Light Control ECU
3. Wire Harness
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
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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
Headlight is flicker.
1. Headlight Main or Sub Bulb
2. Headlight Dimmer Relay (Engine Room J/B)
3. *Light Control ECU
4. Wire Harness
Headlight is dark.
1. Headlight Main or Sub Bulb
2. *Light control ECU
3. Wire Harness
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
Taillight does not come on.
(Headlight does not light)
1. Light Control Switch
2. Wire Harness
Rear combination light does not come on.
1. Light Failure Sensor
2. Wire Harness
3. Bulb
*: 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
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
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
”LO–Beam” does not light (All).
(Headlight main)
1. Headlight Dimmer Switch
2. *Light Control ECU
3. Wire Harness
”LO–Beam” does not light (One side).
(Headlight main)
1. Headlight Main Bulb
2. *Light Control ECU
3. Wire Harness
”HI–Beam” does not light (All).
(Headlight main)
1. Headlight Dimmer Switch
2. *Light Control ECU
3. Wire Harness
BE–6
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BODY ELECTRICAL
TROUBLESHOOTING
1869
”HI–Beam” does not light (One side).
(Headlight main)
1. Headlight Main Bulb
2. *Light Control ECU
3. Wire Harness
”Flash” does not light.
(Headlight main)
1. Headlight Dimmer Switch
2. *Light Control ECU
3. Wire Harness
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
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
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
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
Headlight is flicker.
1. Headlight Main or sub Bulb
2. Headlight Dimmer Relay (Engine Room J/B)
3. *Light Control ECU
4. Wire Harness
Headlight is dark.
1. Headlight Main or Sub Bulb
2. *Light control ECU
3. Wire Harness
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
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
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
*: HID Type
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