Lexus SC300 / Lexus SC400. Service manual — part 735

OK

NG

OK

NG

INSPECTION PROCEDURE

1

Check telescopic motor.

C

P

Disconnect telescopic motor connector.

Connect positive

(negative

) terminal to terminal

1 of telescopic motor connector and negative

(posi-

tive

) terminal to terminal 2.

Replace telescopic motor.

2

Check harness and connector between ECU and telescopic motor (See page IN–33).

Repair or replace harness or connector.

Proceed to next circuit inspection shown on ma-
trix chart (See page SR–52).

–

STEERING

STEERING COLUMN

SR–79

SR–52

).

IN–33

).

WIRING DIAGRAM

Auto Set Switch Circuit

CIRCUIT DESCRIPTION

This is the main switch for auto operation.
When the switch is off, auto operation is prohibited.

DIAGNOSTIC CHART

DIAGNOSTIC CHART

SR–80

–

STEERING

STEERING COLUMN

NG

OK

OK

NG

INSPECTION PROCEDURE

1

Check voltage between terminals ASW and E

1

of ECU connector.

C

OK

P

Remove ECU with connectors still connected.

Measure voltage between terminals ASW and E

1

of

ECU connector when auto switch is on and off.

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

SR–52

).

2

Check auto set switch.

C

OK

P

Disconnect combination switch connector.

Measure resistance between terminals 2 (7) and 6 (8)
of combination switch connector when auto switch is on
and off.

( ): SC300

Replace tilt & telescopic switch.

Go to Step

–

STEERING

STEERING COLUMN

SR–81

OK

NG

3

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

IN–33

).

Repair or replace harness or connector.

Check and replace ECU.

SR–82

–

STEERING

STEERING COLUMN