Lexus SC300 / Lexus SC400. Manual - part 733

–MEMO–

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STEERING

STEERING COLUMN

SR–69

SR–52

).

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

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  

SR–52

).

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

SR–52

).

IN–33

).

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