Lexus RX300 (MCU15). Service manual — part 350
I19265
Passenger Door ECU
LSWE
A–
A+
LSW
24
2
16
L–R
6
19
KL
KUL
13
L–Y
GR–R
GR
P
P–L
2 (*1)
D10 (*1)
D9 (*2)
Door Lock Motor
Door Unlock
Detection Switch
Door Key Lock and
Unlock Switch
F17
4 (*2)
1 (*1)
3 (*2)
6 (*1)
7 (*2)
5 (*1)
8 (*2)
3 (*1)
2 (*2)
4 (*1)
1 (*2)
*1: LHD
*2: RHD
F17
F17
F17
F17
F17
Lock
Unlock
DI–632
–
DIAGNOSTICS
PASSENGER DOOR CONTROL SYSTEM
LEXUS RX300 (RM785E)
Door key lock and unlock switch circuit
CIRCUIT DESCRIPTION
The door key lock and unlock switch is built in the door key cylinder. When the key is turned to the lock side,
terminal 3 of the switch is grounded and when the key is turned to the unlock side, terminal 2 of the switch
is grounded.
Door key lock and unlock switch can be checked using DTC check. (Refer to DI–708)
WIRING DIAGRAM
DI2F1–07
–
DIAGNOSTICS
PASSENGER DOOR CONTROL SYSTEM
DI–633
LEXUS RX300 (RM785E)
INSPECTION PROCEDURE
1
Check the door key lock and unlock switch using DTC check
(See page DI–708).
OK
Proceed to next circuit inspection shown on
problem symptoms table (See page DI–570).
NG
2
Check the door key lock and unlock switch (See page BE–97).
NG
Replace the door key lock and unlock switch.
NG
3
Check wireharness and connector between door key lock and unlock switch and
passenger door ECU.
NG
Repair or replace wireharness or connector.
OK
Proceed to next circuit inspection shown on
problem symptoms table
(See page DI–570).
I03216
D6
Door Courtesy Light Front RH (*1)
D5
Door Courtesy Light Front LH (*2)
Passenger Door ECU
+B
11 (*1)
10 (*2)
2
1
CTYB
CYL
CTY
CTYE
D8
Door Courtesy Switch RH (*1)
D7
Door Courtesy Switch LH (*2)
F17
4
17
23
L–B
R–W
G–W
R–B
CPU
21
F17
F17
F17
10 (*1)
11 (*2)
*1: LHD
*2: RHD
DI–634
–
DIAGNOSTICS
PASSENGER DOOR CONTROL SYSTEM
LEXUS RX300 (RM785E)
Door courtesy light and courtesy switch circuit
CIRCUIT DESCRIPTION
The door courtesy switch goes on when the door is opened and goes off when door is closed.
WIRING DIAGRAM
DI2F2–09
–
DIAGNOSTICS
PASSENGER DOOR CONTROL SYSTEM
DI–635
LEXUS RX300 (RM785E)
INSPECTION PROCEDURE
1
Check operation of door courtesy light.
CHECK:
Check that door courtesy light comes on when door opened, and goes off when door is closed.
OK:
Must be operated normally.
OK
Proceed to next circuit inspection shown on
problem symptoms table (See page DI–570).
NG
2
Check courtesy light (See page BE–48).
NG
Replace the courtesy light.
OK
3
Check courtesy switch (See page BE–48).
NG
Replace the courtesy switch.
OK
4
Check wireharness and connector between courtesy light and passenger door
ECU, courtesy switch and passenger door 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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