Lexus SC300 / Lexus SC400. Manual — part 186
Location of Connectors in Instrument Panel
BE–374
–
BODY ELECTRICAL SYSTEM
Door Lock Control System
–
BODY ELECTRICAL SYSTEM
Door Lock Control System
BE–375
Check DOME fuse.
NG
OK
Check for short in all the harness
and components connected to the
DOME fuse (See attached wiring
diagram).
1
Check and repair harness and connector
between ECU and battery.
Proceed to next circuit inspection
shown on matrix chart (See page
Repair or replace harness or
connector.
Check voltage between terminals +B1
and E of ECU connector.
Check for open in harness and connector
between ECU and body ground (See page
).
OK
OK
NG
NG
2
3
WIRING DIAGRAM
CIRCUIT INSPECTION
ECU Power Source Circuit
CIRCUIT DESCRIPTION
This circuit provides power to operate the theft deterrent and door lock ECU.
DIAGNOSTIC CHART
BE–376
–
BODY ELECTRICAL SYSTEM
Door Lock Control System
OK
NG
NG
OK
OK
NG
INSPECTION PROCEDURE
1
Check DOME fuse.
C
OK
P
Remove DOME fuse from R/B No. 2.
Check continuity of DOME fuse.
Continuity
Check for short in all the harness and components con-
nected to the DOME fuse (See attached wiring diagram).
2
Check voltage between terminals +B1 and E of ECU connector.
C
OK
P
1.
Remove the No. 1 under cover and heater duct.
2.
Disconnect the theft deterrent and door lock ECU
connectors.
Measure voltage between terminals +B1 and E of ECU
connector.
Voltage:
10 – 14 V
Proceed to next circuit inspection shown on matrix chart
(See page
3
Check for open in harness and connector between ECU and body ground (See page
).
Repair or replace harness or connector.
Check and repair harness and connector between
ECU and battery.
–
BODY ELECTRICAL SYSTEM
Door Lock Control System
BE–377
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