Lexus SC300 / Lexus SC400. Service manual - part 736

–MEMO–

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STEERING

STEERING COLUMN

SR–83

Operation of the switch sends different voltage

signals to the ECU.

SR–52

).

 

IN–33

).

WIRING DIAGRAM

Manual Switch Circuit

CIRCUIT DESCRIPTION

DIAGNOSTIC CHART

DIAGNOSTIC CHART

SR–84

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STEERING

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NG

OK

OK

NG

INSPECTION PROCEDURE

1

Check voltage between terminals V

C

 and MSW of ECU connector.

C

OK

P

Remove ECU with connectors still connected.

Measure voltage between terminals V

C

 and MSW of

ECU connector when manual switch is operated.

Proceed to next circuit inspection shown on matrix chart
(See page  

SR–52

).

2

Check manual switch.

C

OK

P

Disconnect combination switch connector.

Measure resistance between terminals 3 (4) and 5 (6)
of combination switch connector when manual switch is
operated.

( ): SC200

Replace tilt & telescopic switch.

Go to Step 

.

–

STEERING

STEERING COLUMN

SR–85

OK

NG

3

Check harness and connector between ECU and tilt & telescopic switch (See page  

IN–33

).

Replace tilt & telescopic switch.

Check and replace ECU.

SR–86

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STEERING

STEERING COLUMN