Body Electrical System Troubleshooting; Key Unlock Warning Switch Troubles; Headlight And Taillight System Troubles - Lexus 2005 IS300 User Manual

BE-2
TROUBLESHOOTING
PROBLEM SYMPTOMS TABLE
IGNITION SWITCH AND
This system uses the multiplex communication system, so check diagnosis system of the multiplex commu-
nication system before you proceed with troubleshooting.
Symptom
Ignition switch is not set to each position.
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
Key unlock warning system does not operate.
(The buzzer sounds when the ignition key is ACC or ON)
w/o Daytime running light system:
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.
Symptom
"Automatic light control system" does not operate.
Auto turn-off system does not operate when the driver's door is
opened.
Auto turn-off system:
Headlight and taillight do not come on.
Auto turn-off system:
Headlight and taillight stay on.
Only one headlight comes on.
"LO-Beam" does not light (All).
"LO-Beam" does not light (One side).
"HI-Beam" does not light (All).
BODY ELECTRICAL - TROUBLESHOOTING
11.Ignition switch
12.Power source circuit
1. Ignition Switch
2. Key Unlock Warning Switch
3. Body ECU
4. Combination Meter
5. Wire Harness
1. Automatic Light Control Sensor
2. Light Control Switch
3. Door Courtesy Switch
4. Wire Harness
5. Theft Deterrent ECU
6. Body ECU
1. Drivers Door Courtesy Switch
2. Body ECU
1. Body ECU
2. Wire Harness
1. Body ECU
2. Wire Harness
1. Bulb
2. Light Control Sensor
3. Wire Harness
1. Headlight Control Relay
2. Light Control Sensor
3. Wire Harness
1. Bulb
2. H-LP L-LWR Fuse
3. H-LP R-LWR Fuse
4. Wire Harness
1. Headlight Dimmer Switch
2. Wire Harness
Suspect Area
Suspect Area
Suspect Area
Author : Date :
BE16S-06
See page
BE-21
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See page
BE-21
BE-21
DI-893
BE-90
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See page
BE-31
BE-31
BE-58
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DI-776
DI-893
BE-58
DI-893
DI-893
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DI-893
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-
BE-31
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BE-31
BE-31
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BE-15
BE-15
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BE-31
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2003