Lexus SC300 / Lexus SC400. Manual — part 771
LOCATION OF CONNECTORS IN SEAT
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SR–61
).
WIRING DIAGRAM
CIRCUIT INSPECTION
ECU Power Source Circuit
CIRCUIT DESCRIPTION
The ECU power source also supplies power to the CPU and sensor, etc. Power is supplied to the ECU even
when the ignition switch is off.
DIAGNOSTIC CHART
DIAGNOSTIC CHART
SR–62
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NG
OK
OK
NG
INSPECTION PROCEDURE
1
Check voltage between terminals ECU–B and ECU–E of ECU connector.
C
OK
P
Remove ECU with connectors still connected.
Measure voltage between terminals ECU–B and ECU–
E of ECU connector.
Voltage:
10 ~ 14 V
Proceed to next circuit inspection shown on matrix chart
(See page
2
Check continuity between terminal ECU–E of ECU connector and body ground.
C
OK
Measure resistance between terminal ECU–E of ECU
connector and body ground.
Resistance:
1
or less
Repair or replace harness or connector.
Go to Step
.
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SR–63
OK
NG
3
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 DOME Fuse (See attached wiring diagram).
Check harness and connector between ECU and
battery (See page
).
SR–64
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