Lexus RX300 (MCU15). Manual — part 340
I12716
BCTY
13
B7
5
IA2
Battery
1
BC2
5
W–R
W–R
A
2I
1
Junction
Connector
R19
Rear Interior Light
DOOR
D4
DIODE
R–B
W–R
W–R
2
2 1
R
1
1
BC2
A
J3
C
J4
R
2A
3
R
DOME
Short Pin
Engine Room J/B
Junction
Connector
J14
W–R
ON
Body ECU
BN
2
B9
Back Door
Courtesy Switch
W
1
3
1
W–B
W
F11
FL Block
DI–592
–
DIAGNOSTICS
BODY CONTROL SYSTEM
LEXUS RX300 (RM785E)
Rear interior light and back door courtesy switch circuit
CIRCUIT DESCRIPTION
The back door courtesy switch goes on when back door is opened and goes off when back door is closed.
WIRING DIAGRAM
DI1OZ–07
–
DIAGNOSTICS
BODY CONTROL SYSTEM
DI–593
LEXUS RX300 (RM785E)
INSPECTION PROCEDURE
HINT:
In case of using the hand–held tester, start the inspection from step 1 and incase of not using the hand–held
tester, start from step 2.
1
Check back door courtesy switch using hand–held tester.
PREPARATION:
Connect the hand–held tester to the DLC 3.
CHECK:
Check the back door courtesy switch using DATA LIST.
OK
Proceed to next circuit inspection shown on
problem symptoms table (See page DI–570).
NG
2
Check back door courtesy switch (See page BE–109).
NG
Replace the back door courtesy switch.
OK
3
Check wireharness and connector between back door courtesy 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).
I08133
S10
Stop Light Switch
5E
STOP
B7
G–O
18
Body ECU
5E
1A
12
11
1
STPI
1
Instrument Panel J/B
J/B No.5
G–W
G–B
1E
ALT
FUSE
1
2
DI–594
–
DIAGNOSTICS
BODY CONTROL SYSTEM
LEXUS RX300 (RM785E)
Stop light switch circuit
CIRCUIT DESCRIPTION
The Body ECU is detecting the condition of the stop light switch.
WIRING DIAGRAM
DI1P4–12
–
DIAGNOSTICS
BODY CONTROL SYSTEM
DI–595
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 stop light switch using hand–held tester.
PREPARATION:
Connect the hand–held tester to the DLC 3.
CHECK:
Check the stop light switch using DATA LIST.
OK
Proceed to next circuit inspection shown on
problem symptoms table (See page DI–570).
NG
2
Check stop light switch (See page BE–53).
NG
Replace the stop light switch.
OK
3
Check wireharness and connector between stop light switch and Body ECU, bat-
tery and stop light switch.
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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