Lexus RX300 (MCU15). Manual — part 339
I12718
Front Interior
Light
Body ECU
B7
ILE
10
Key Cylinder
Light
C
J/B No.5
R–W
R–Y
1
1
5C
J4
ON
2
2
R
R
R
W
5
ID1
DOOR
3
9
OFF
2A
2I
Junction
Connector
Short Pin
2
R
DOME
Engine Room J/B
Battery
J4
C
R
5B
5B
8
6
ID1
3
R–W
R–W
5F
5F
6
J/B No.5
5B
1
2
1
3
F11
FL BLOCK
W
DI–588
–
DIAGNOSTICS
BODY CONTROL SYSTEM
LEXUS RX300 (RM785E)
Illumination circuit
CIRCUIT DESCRIPTION
Receiving the courtesy signal from either of the door ECU, the Body ECU will make the front interior light
and ignition light, come on.
WIRING DIAGRAM
DI1OW–10
–
DIAGNOSTICS
BODY CONTROL SYSTEM
DI–589
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 illumination (interior light, ignition switch light) using hand–held tester.
PREPARATION:
Connect the hand–held tester to the DLC 3.
CHECK:
Check that the illumination can light in an ACTIVE TEST.
OK:
All the illumination should light on.
OK
Proceed to next circuit inspection shown on
problem symptoms table (See page DI–570).
NG
2
Check illumination light.
NG
Replace the failure light.
OK
3
Check wireharness and connector between each illumination light and Body
ECU, battery and each illumination light .
NG
Repair or replace wireharness or connector.
OK
Proceed to next circuit inspection shown on
problem symptoms table
(See page DI–570).
I07435
Body ECU
B7
W–B
KSW
W–B
8
L
IF
Key Unlock
Warning Switch
J7
Junction
Connector
A
A
2
1
DI–590
–
DIAGNOSTICS
BODY CONTROL SYSTEM
LEXUS RX300 (RM785E)
Key unlock warning switch circuit
CIRCUIT DESCRIPTION
The key unlock warning switch goes on when the ignition key is inserted in the key cylinder and goes off when
the ignition key is removed.
The ECU operates the key confinement prevention function while the key unlock warning switch is on.
WIRING DIAGRAM
DI1OX–12
–
DIAGNOSTICS
BODY CONTROL SYSTEM
DI–591
LEXUS RX300 (RM785E)
INSPECTION PROCEDURE
1
Check key unlock warning switch (See page BE–26).
NG
Replace the key unlock warning switch.
OK
2
Check wireharness and connector between key unlock warning switch and Body
ECU.
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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