Lexus RX300 (MCU15). Manual — part 338
I19261
Body ECU
Wireless Door Lock Tuner
2
RDA
B6
3
B6
16
17
PRG
IA2
IA2
17
18
LG
LG
L
L
RDA
W5
W5
PRG
DI–584
–
DIAGNOSTICS
BODY CONTROL SYSTEM
LEXUS RX300 (RM785E)
Wireless door lock tuner circuit
CIRCUIT DESCRIPTION
The signal from the transmitter will be input to the body ECU through RDA line. RDA line is diagnosed by
the Body ECU, so check DTC also in case of the failure of the wireless function.
WIRING DIAGRAM
DI1OP–06
–
DIAGNOSTICS
BODY CONTROL SYSTEM
DI–585
LEXUS RX300 (RM785E)
INSPECTION PROCEDURE
1
Check that DTC 42 is not output.
NG
Check the RDA line.
OK
2
Check wireharness.
PREPARATION:
Disconnect connectors of wireless door lock tuner and Body ECU.
CHECK:
Check continuity between terminals RCO of wireless door lock tuner and RCO of Body ECU.
OK:
Continuity
NG
Repair or replace wireharness.
OK
3
Check the wireless door lock tuner.
CHECK:
Replace the wireless door lock tuner and check if it recovers normally.
OK:
Must be recovered normally.
NG
Proceed to next circuit inspection shown on
problem symptoms table (See page DI–570).
OK
Failure of the original wireless door lock tun-
er.
I19262
Buckle
SW
W–B
BE1
G–W
IA2
14
G–W
9
1
A
BF1
13
W–B (*2)
A
Body ECU
7
B7 DBKL
B12
A
(*1)
IM2
12
(*2)
G–W
BF1
8
(*1)
(*2)
(*2)
(*1)
1 B13
(*1)
4 B12
(*2)
4 B13
J17
J/C
16
BJ
BE1
J18
(*2)
(*1)
A
A
J17
J18
(*1)
(*2)
W–B
W–B (*1)
W–B (*1)
(*1)
W–B (*2)
J15
J/C
BM
(*2)
*1: LHD
*2: RHD
DI–586
–
DIAGNOSTICS
BODY CONTROL SYSTEM
LEXUS RX300 (RM785E)
Driver buckle switch circuit
WIRING DIAGRAM
DI1OT–05
–
DIAGNOSTICS
BODY CONTROL SYSTEM
DI–587
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 driver buckle switch using hand–held tester.
PREPARATION:
Connect the hand–held tester to the DLC 3.
CHECK:
Check the driver buckle switch using DATA LIST.
OK
Proceed to next circuit inspection shown on
problem symptoms table (See page DI–570).
NG
2
Check driver buckle switch (See page BE–68).
NG
Replace the driver buckle switch.
OK
3
Check wireharness and connector between driver buckle switch and body
ground.
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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