Lexus SC300 / Lexus SC400. Manual — part 187
NG
OK
NG
OK
1
2
Check P/W fuse.
Check voltage between terminal +B2 of
ECU connector and body ground.
Check and repair harness and connectors
between ECU and battery
(See page
Check for short in all the harness
and components connected to the
DOOR fuse (See attached wiring
diagram).
*1
Proceed to next circuit inspection
shown on matrix chart (See page
WIRING DIAGRAM
*1:
The power source is supplied to the actuator
(door lock motor, luggage compartment door
opener motor) through the theft deterrent and
door lock ECU. Accordingly, if a short circuit of
the W/H or actuator occurs in the actuator circuit,
the DOOR fuse may become OPEN. so also in-
spect the actuator (door lock motor circuit on
page
, and the luggage compartment
door opener motor circuit on page
).
Actuator Power Source Circuit
CIRCUIT DESCRIPTION
This circuit provides power to drive the door lock motor and the luggage compartment door opener mo-
tor.
DIAGNOSTIC CHART
BE–378
–
BODY ELECTRICAL SYSTEM
Door Lock Control System
OK
NG
NG
OK
*1: The power source is supplied to the actuator (door
lock motor, luggage compartment door opener mo-
tor) through the theft deterrent and door lock ECU.
Accordingly, if a short circuit of the W/H or actuator
occurs in the actuator circuit, the DOOR fusible link
may become OPEN, so also inspect the actuator
(door lock motor circuit on page
, and the
luggage compartment door opener motor circuit on
page
INSPECTION PROCEDURE
1
Check DOOR fuse.
C
OK
P
1.
Remove the No. 1 under cover and LH lower pad.
2.
Remove the DOOR fusible link from J/B No. 1.
Check continuity of DOOR fuse.
Continuity
Check for short in all the harness and components con-
nected to the DPPR fusible link (See attached wiring dia-
gram). *1
2
Check voltage between terminal +B2 of ECU connector and body ground.
C
OK
P
1.
Remove No. 1 under cover and heater duct.
2.
Disconnect the theft deterrent and door lock ECU
connector.
Measure voltage between terminal +B2 of ECU connec-
tor and body ground.
Voltage:
10 – 14 V
Proceed to next circuit inpsection shown on matrix chart
(See page
Check and repair harness and connectors be-
tween ECU and battery (See page
–
BODY ELECTRICAL SYSTEM
Door Lock Control System
BE–379
NG
Check operating sound of door lock
motor.
OK
NG
OK
Check door lock motor.
Check and harness connectors between ECU
and door lock motor (See page
Replace door lock motor.
1
2
WIRING DIAGRAM
Proceed to next circuit inspection
shown on matrix chart (See page
Repair or replace door lock control
link.
Repair or replace harness or
connector.
3
OK
NG
Door Lock Motor Circuit
CIRCUIT DESCRIPTION
The door lock motor locks and unlocks the door in accordance with signals from the ECU.
DIAGNOSTIC CHART
HINT: Inspect the door which is malfunctioning.
BE–380
–
BODY ELECTRICAL SYSTEM
Door Lock Control System
NG
OK
NG
OK
OK
NG
INSPECTION PROCEDURE
1
Check operating sound of door lock motor.
C
OK
Hint
Check operating sound of door lock motor, when door
lock control switch is pushed to the lock side and unlock
side.
Can hear operating sound of door lock motor.
Inspect the door which is malfunctioning.
Repair or replace door lock control link.
2
Check door lock motor.
C
OK
Hint
P
1.
Remove the door trim and service hole cover.
2.
Disconnect the door lock motor connector.
1.
Connect positive
lead to terminal 5 and nega-
tive
lead to terminal 2 o door lock motor connec-
tor.
2.
Connect positive
lead to terminal 2 and negative
lead to terminal 5 of, door lock motor connector.
1.
Door lock motor locks door.
2.
Door lock motor unlocks door.
Perform inspection in a short time (within 2 seconds).
Replace door lock motor.
3
Check harness and connectors between ECU and door lock motor (See page
Repair or replace harness or connector.
Proceed to next circuit inspection shown on ma-
trix chart (See page
).
–
BODY ELECTRICAL SYSTEM
Door Lock Control System
BE–381
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