Lexus GS300/400 (2000 year). Service manual — part 80

BE0H9–05

I04239

Switch Body

Wiper and Washer Switch

Light Control Switch and
Headlight Dimmer Switch

Steering Angle Sensor

Steering Position Disc

Spiral Cable

Tilt and Telescopic Switch

Compression Spring

Cancel Cam

BE–34

–

BODY ELECTRICAL

HEADLIGHT AND TAILLIGHT SYSTEM

2335

COMPONENTS

I04240

BE0K2–02

I04241

I04242

I04243

I04244

–

BODY ELECTRICAL

HEADLIGHT AND TAILLIGHT SYSTEM

BE–35

2336

REMOVAL

1.

REMOVE SPIRAL CABLE

Remove the 4 screws and the spiral cable.

2.

REMOVE WIPER AND WASHER SWITCH

Remove the 2 screws and the wiiper and washer switch.

3.

REMOVE TILT AND TELESCOPIC SWITCH

Remove a screw and the tilt and telescopic switch.

4.

REMOVE STEERING ANGLE SENSOR

Disengage the 2 claws and the steering angle sensor.

5.

REMOVE LIGHT CONTROL SWITCH

Remove the 2 screws and the light control switch.

I04245

I04246

I04247

BE–36

–

BODY ELECTRICAL

HEADLIGHT AND TAILLIGHT SYSTEM

2337

6.

REMOVE STEERING POSITION DISC

7.

REMOVE CANCEL CAM

Turn the cancel cam with pressing it and pull it out.

8.

REMOVE COMPRESSION SPRING

BE0HA–02

I04033

HI

Flash

OFF

TAIL

HEAD

AUTO

LO

–

BODY ELECTRICAL

HEADLIGHT AND TAILLIGHT SYSTEM

BE–37

2338

INSPECTION

1.

FAIL–SAFE FUNCTION
(Light Control ECU)

When input error is inspected.

When input voltage is not within the range of operation voltage (9 to 16 V),

lighting of the headlight stops. As soon as the voltage comes within the range,

it lights up again.

However if the input voltage becomes low after lighting up,

sufficient voltage is maintained until light of bulb completely goes off.

When output error is inspected (Open or short).

When light flushing is inspected.

When an error occurs in the output voltage (open or short) or flushing symptom

occurs on the bulb, lighting of the headlight stops, the condition is maintained

until power is turned ON again (headlight dimmer switch OFF

→

ON).

In this case, it can not be judged whether lighting malfunction is caused by an

output error or other reasons (fuse blown out, etc.).

Check that there is no error in fuse and wiring (including power source) and

replace the bulb in the first place, when the error still appears, replace the light

control ECU.

2.

INSPECT LIGHT CONTROL SWITCH CONTINUITY

Switch position

Tester connection

Specified condition

OFF

–

No continuity

TAIL

15 – 16

Continuity

HEAD

14 – 15 – 16

Continuity

AUTO

13 – 16

Continuity

If continuity is not as specified, replace the switch.
3.

INSPECT HEADLIGHT DIMMER SWITCH CONTINU-
ITY

Switch position

Tester connection

Specified condition

Low beam

17 – 18

Continuity

High beam

8 – 17

Continuity

Flash

8 – 9 – 17

Continuity

If continuity is not as specified, replace the switch.