Lexus LS400 (2000 year). Manual — part 52

BE0BD–01

I03239

Light Control Switch

Steering Position Sensor

Switch Body

Wiper and Washer Switch

Tilt and Telescopic
Switch

Steering Position
Disc

Spiral Cable

BE–36

–

BODY ELECTRICAL

HEADLIGHT AND TAILLIGHT SYSTEM

1899

COMPONENTS

BE0BE–01

N12983

N13660

N12985

N12983

N12986

–

BODY ELECTRICAL

HEADLIGHT AND TAILLIGHT SYSTEM

BE–37

1900

REMOVAL

Installation is in the reverse order of removal.
1.

REMOVE COLUMN COVER

(a)

Remove the 3 screws.

(b)

Remove the column cover.

2.

REMOVE POWER TILT AND TELESCOPIC SWITCH

(a)

Remove the screw.

(b)

Remove the power tilt and telescopic switch.

3.

REMOVE LIGHT CONTROL SWITCH

(a)

Disconnect the light control switch connector.

(b)

Remove the 2 screws.

(c)

Remove the switch.

4.

REMOVE COLUMN COVER

(a)

Remove the 3 screws.

(b)

Remove the column cover.

5.

REMOVE WIPER AND WASHER SWITCH

(a)

Disconnect the wiper and washer switch connector.

(b)

Remove the 2 screws.

(c)

Remove the switch.

BE0BF–01

N13671

AUTO

HEAD

TAIL

OFF

ON

OFF

BE–38

–

BODY ELECTRICAL

HEADLIGHT AND TAILLIGHT SYSTEM

1901

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 it lit 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 FOG LIGHT SWITCH CONTINUITY

Switch position

Tester connection

Specified condition

OFF

–

No continuity

ON

11 – 12

Continuity

If continuity is not as specified, replace the switch.

N13670

RIGHT TURN

LEFT TURN

LO

HI

FLASH

N13672

Wire Harness Side

–

BODY ELECTRICAL

HEADLIGHT AND TAILLIGHT SYSTEM

BE–39

1902

4.

INSPECT HEADLIGHT DIMMER SWITCH CONTINU-
ITY

Switch position

Tester connection

Specified condition

Flash

8 – 9 – 17

Continuity

Low beam

17 – 18

Continuity

High beam

8 – 17

Continuity

If continuity is not as specified, replace the switch.
5.

INSPECT TURN SIGNAL SWITCH CONTINUITY

Switch position

Tester connection

Specified condition

Left turn

1 – 2

Continuity

Neutral

–

No continuity

Right turn

2 – 3

Continuity

If continuity is not as specified, replace the switch.

6.

USA:
INSPECT SWITCH CIRCUIT

(a)

Disconnect the connector from the switch and inspect the
connector on the wire harness side, as shown.

Light Control Switch Circuit

Tester connection

Condition

Specified condition

16 – Ground

Constant

Continuity

Fog Light Switch Circuit

Tester connection

Condition

Specified condition

11 – 18

Constant

Continuity

12 – Ground

Constant

Battery positive voltage

Dimmer Switch Circuit

Tester connection

Condition

Specified condition

17 – Ground

Constant

Continuity

9 – Ground

Constant

Battery positive voltage

Turn Signal Switch Circuit

Tester connection

Condition

Specified condition

2 – Ground

Constant

Continuity

If the circuit is not as specified, inspect the wire harness.