Lexus SC300 / Lexus SC400. Manual — part 736

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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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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

.

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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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