Lexus RX300 (MCU15). Manual — part 337
I19259
Body ECU
Taillight Relay
G–W
B8
TRLY
To Rear
Fog Light Relay
1J
4
7
1B
1A
1
FR FOG
1
2
5
3
To ALT
FUSE
7
Instrument Panel J/B
1B
6
1F
7
TAIL
Fog Light
Relay
(*2)
To Front Fog
Light RH (*2)
1
2
3
5
2
1J
To Front Fog
Light LH (*2)
To Front Fog
Light (*1)
To Body ECU
DI–580
–
DIAGNOSTICS
BODY CONTROL SYSTEM
LEXUS RX300 (RM785E)
Taillight relay circuit
CIRCUIT DESCRIPTION
Taillight relay will be ”ON” by operating the taillight switch. The transistor which activates the tail light relay
has two sorts: one activates by the tail light switch for fail safe and the other activates by CPU.
WIRING DIAGRAM
DI1ON–19
–
DIAGNOSTICS
BODY CONTROL SYSTEM
DI–581
LEXUS RX300 (RM785E)
INSPECTION PROCEDURE
HINT:
In case of using the hand–held tester, start the inspection from step 1 and in case of not using the hand–held
tester, start from step 2.
1
Check taillight relay using hand–held tester.
PREPARATION:
Connect the hand–held tester to the DLC 3.
CHECK:
Check that the taillight relay can operate in an ACTIVE TEST.
OK
Proceed to next circuit inspection shown on
problem symptoms table (See page DI–570).
NG
2
Check taillight relay (See page BE–31).
NG
Replace the taillight relay.
OK
3
Check wireharness and connector between taillight relay and Body ECU, battery
and taillight relay.
NG
Repair or replace wireharness or connector.
OK
Proceed to next circuit inspection shown on
problem symptoms table
(See page DI–570).
I19260
Body ECU
R
B5
HRLY
12
2I
2A
To Headlight LH
(Low Beam)
1
Engine Room J/B
Head Lamp
Relay
(*1) To High Beam Indicator Light
6
2B
1
1
MAIN
To Battery
2F
2F
2
1
2
3
4
1
2
5
2F
2F
3
H–LP RH
*1
H–LP R LWR
*2
*1: RHD Only
*2: LHD Only
(*1)
(*1)
H–LP LH
*1
H–LP L LWR
*2
To Headlight RH
(High Beam)
(*1)
To Headlight RH
(Low Beam)
To Headlight LH
(High Beam)
(*1)
(*1)
DI–582
–
DIAGNOSTICS
BODY CONTROL SYSTEM
LEXUS RX300 (RM785E)
Headlight relay circuit
CIRCUIT DESCRIPTION
Head light relay will be ”ON” by operating the headlight switch. The transistor which activates the taillight
relay has two sorts: one activates directly by the headlight switch for fail safe and the other activates by CPU.
the one that activates by CPU has two systems and prevents the headlight from turning off at the time of
one system trouble in the automatic operation circuit.
WIRING DIAGRAM
DI1OO–12
–
DIAGNOSTICS
BODY CONTROL SYSTEM
DI–583
LEXUS RX300 (RM785E)
INSPECTION PROCEDURE
HINT:
In case of using the hand–held tester, start the inspection from step 1 and in case of not using the hand–held
tester, start from step 2.
1
Check headlight relay using hand–held tester.
PREPARATION:
Connect the hand–held tester to the DLC 3.
CHECK:
Check that the headlight relay can operate in an ACTIVE TEST.
OK:
If the head light relay is normal, the head light comes ”ON”. In the case that the head light relay activates
but the head light will not come on, check the head light circuit.
OK
Proceed to next circuit inspection shown on
problem symptoms table (See page DI–570).
NG
2
Check headlight relay (See page BE–31).
NG
Replace the headlight relay.
OK
3
Check wireharness and connector between headlight relay and Body ECU, bat-
tery and headlight relay.
NG
Repair or replace wireharness or connector.
OK
Proceed to next circuit inspection shown on
problem symptoms table
(See page DI–570).
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