Lexus SC300 / Lexus SC400. Service manual — part 733
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STEERING
STEERING COLUMN
SR–69
![](/vehicle/tus/kendre/chaul/chouvobeld.png)
WIRING DIAGRAM
Sensor Power Source Circuit
CIRCUIT DESCRIPTION
Power to the position sensors, manual switch and auto set switch is output from the ECU.
DIAGNOSTIC CHART
DIAGNOSTIC CHART
SR–70
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STEERING
STEERING COLUMN
![](/vehicle/tus/kendre/chaul/gacr.png)
OK
NG
OK
NG
OK
NG
INSPECTION PROCEDURE
1
Check voltage between terminals V
C
and E
1
of ECU connector.
C
OK
P
Remove ECU with connectors still connected.
Measure voltage between terminals V
C
and E
1
of ECU
connector.
Voltage:
4 – 6 V
Go to Step
.
2
Check for open in harness and connector between terminals Vc and E
1
of ECU connector.
Repair or replace harness or connector.
Proceed to next circuit inspection shown on ma-
trix chart (See page
3
Check for short in harness between terminal V
C
and E
1
of ECU connector.
Repair or replace harness or connector.
Check and replace ECU.
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STEERING
STEERING COLUMN
SR–71
![](/vehicle/tus/kendre/chaul/justancchond.png)
).
WIRING DIAGRAM
Tilt Position Sensor Circuit
CIRCUIT DESCRIPTION
The tilt position is sent to the ECU as a voltage signal from the position sensor.
A constant 5 V is supplied to terminal 1 of sensor.
The voltage at terminal 3 varies with position and is input to the ECU.
DIAGNOSTIC CHART
DIAGNOSTIC CHART
SR–72
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STEERING
STEERING COLUMN
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