Lexus RX300 (MCU15). Service manual — part 113
BODY ELECTRICAL
BODY ELECTRICAL SYSTEM
BE–1
. . . . . . . . . . . . .
TROUBLESHOOTING
BE–2
. . . . . . . . . . . . . . . . . . . .
POWER SOURCE
BE–13
. . . . . . . . . . . . . . . . . . . . . . .
IGNITION SWITCH AND KEY UNLOCK
WARNING SWITCH
BE–25
. . . . . . . . . . . . . . . . . . . .
HEADLIGHT AND TAILLIGHT SYSTEM
BE–28
. . . .
HEADLIGHT BEAM LEVEL CONTROL
SYSTEM
BE–38
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FOG LIGHT SYSTEM
BE–40
. . . . . . . . . . . . . . . . . . . .
TURN SIGNAL AND HAZARD
WARNING SYSTEM
BE–43
. . . . . . . . . . . . . . . . . . . .
INTERIOR LIGHT SYSTEM
BE–47
. . . . . . . . . . . . . . .
STOP LIGHT SYSTEM
BE–52
. . . . . . . . . . . . . . . . . . .
WIPER AND WASHER SYSTEM
BE–55
. . . . . . . . . . .
COMBINATION METER
BE–61
. . . . . . . . . . . . . . . . . .
DEFOGGER SYSTEM
BE–78
. . . . . . . . . . . . . . . . . . . .
POWER WINDOW CONTROL SYSTEM
BE–81
. . . .
POWER DOOR LOCK CONTROL
SYSTEM
BE–96
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DOUBLE LOCKING SYSTEM
BE–104
. . . . . . . . . . . . .
THEFT DETERRENT SYSTEM
BE–108
. . . . . . . . . . . .
WIRELESS DOOR LOCK CONTROL
SYSTEM
BE–110
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
POWER SEAT CONTROL SYSTEM
BE–125
. . . . . . . .
POWER MIRROR CONTROL SYSTEM
BE–133
. . . . .
ELECTRO CHROMIC MIRROR SYSTEM
BE–136
. . .
SEAT HEATER SYSTEM
BE–139
. . . . . . . . . . . . . . . . . .
AUDIO SYSTEM (Europe)
BE–142
. . . . . . . . . . . . . . . . .
AUDIO SYSTEM (Except Europe)
BE–149
. . . . . . . . . .
ANTENNA
BE–181
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MULTI DISPLAY
BE–188
. . . . . . . . . . . . . . . . . . . . . . . . .
ENGINE IMMOBILISER SYSTEM
BE–189
. . . . . . . . . .
HORN SYSTEM
BE–191
. . . . . . . . . . . . . . . . . . . . . . . . .
BE0DC–06
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BODY ELECTRICAL
BODY ELECTRICAL SYSTEM
BE–1
LEXUS RX300 (RM785E)
BODY ELECTRICAL SYSTEM
PRECAUTION
Take care to observe the following precautions when performing inspections or removal and replacement
of body electrical related parts.
1.
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
The LEXUS RX300 is equipped with an SRS (Supplemental Restraint System) such as the driver airbag and
front passenger airbag. failure to carry out service operation in the correct sequence could cause the SRS
to unexpectedly deployed during servicing, possibly leading to a serious accident. Before servicing (includ-
ing removal or installation of parts, inspection or replacement), be sure to read the precautionary codices
in the RS section.
2.
COMBINATION METER SYSTEM
The cold cathode tube connectors (Connectors ”N”, ”P” and ”Q”) in the combination meter are charged with
high voltage AC current when power is supplied, so do not touch them when they are charged.
3.
AUDIO SYSTEM
If the battery negative (–) terminal is disconnected, the preset AM, FM 1 and FM 2 stations stored in memory
are erased, so be sure to not the stations and reset them after the battery terminal is reconnected.
4.
MOBILE COMMUNICATION SYSTEM
If the vehicle is equipped with a mobile communication system, refer to precautions in the IN section.
BE1AT–02
BE–2
–
BODY ELECTRICAL
TROUBLESHOOTING
LEXUS RX300 (RM785E)
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.
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.
5. Ignition switch
6. Power source circuit
BE–26
BE–18
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–26
BE–48
DI–598
DI–676
DI–564
–
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–26
–
–
–
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
Suspect Area
See page
Only one headlight comes on.
1. H–LP L LWR Fuse (Engine Room J/B)
2. H–LP R LWR Fuse (Engine Room J/B)
3. Headlight Bulb
4. Wire Harness
–
–
–
–
”LO–Beam” does not light (All).
1. Headlight Dimmer Switch
2. Wire Harness
BE–31
–
”LO–Beam” does not light (One side).
1. Headlight Bulb
2. Wire Harness
–
–
”HI–Beam” does not light (All).
1. Headlight Dimmer Switch
2. Wire Harness
BE–31
–
”HI–Beam” does not light (One side).
1. Headlight Bulb
2. Wire Harness
–
–
”Flash” does not light.
1. Headlight Dimmer Switch
2. Wire Harness
BE–31
–
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