Lexus RX300 (MCU15). Service manual — part 344
I19265
Driver Door ECU
LSWE
A–
A+
LSW
24
2
16
L–R
6
19
KL
KUL
13
L–Y
GR–R
GR
P
P–L
4 (*1)
D7 (*1)
D8 (*2)
Door Lock Motor LH
Door Lock Motor
Door Unlock
Detection Switch
Door Key Lock and
Unlock Switch
D12
D12
D12
D12
D12
D12
2 (*2)
3 (*1)
1 (*2)
7 (*1)
6 (*2)
8 (*1)
5 (*2)
2 (*1)
3 (*2)
1 (*1)
4 (*2)
*1: LHD
*2: RHD
DI–608
–
DIAGNOSTICS
DRIVER DOOR CONTROL SYSTEM
LEXUS RX300 (RM785E)
Door unlock detection switch circuit
CIRCUIT DESCRIPTION
The door unlock detection switch is built in the door lock motor assembly. This switch is ON when the door
lock knob is in the unlock position and OFF when the lock knob is in the lock position. The ECU detects the
door lock knob conditions is this circuit. It is used as one of the operating conditions for the key confinement
prevention function.
WIRING DIAGRAM
DI2BP–10
–
DIAGNOSTICS
DRIVER DOOR CONTROL SYSTEM
DI–609
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 door unlock detection switch using hand–held tester.
PREPARATION:
Connect the hand–held tester to the DLC 3.
CHECK:
Check the door unlock detection switch using DATA LIST.
OK
Proceed to next circuit inspection shown on
problem symptom table (See page DI–570).
NG
2
Check door unlock detection switch (See page BE–97).
NG
Replace the door lock motor.
OK
3
Check wireharness and connector between door unlock detection switch and
driver door ECU.
NG
Repair or replace wireharness or connector.
OK
Proceed to next circuit inspection shown on
problem symptoms table
(See page DI–570).
I19265
Driver Door ECU
LSWE
A–
A+
LSW
24
2
16
L–R
6
19
KL
KUL
13
L–Y
GR–R
GR
P
P–L
4 (*1)
D7 (*1)
D8 (*2)
Door Lock Motor LH
Door Lock Motor
Door Unlock
Detection Switch
Door Key Lock and
Unlock Switch
D12
D12
D12
D12
D12
D12
2 (*2)
3 (*1)
1 (*2)
7 (*1)
6 (*2)
8 (*1)
5 (*2)
2 (*1)
3 (*2)
1 (*1)
4 (*2)
*1: LHD
*2: RHD
DI–610
–
DIAGNOSTICS
DRIVER 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
DI2BQ–10
–
DIAGNOSTICS
DRIVER DOOR CONTROL SYSTEM
DI–611
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
driver 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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