Lexus ES300 (1997 year). Service manual — part 105

BE04X–01

N21561

Steering Position Sensor

Combination Switch

Light Control Switch

Headlight Dimmer Switch

Switch Body

Steering Position Disc

Wiper and Washer Switch

Combination Switch

Spiral Cable

BE–26

–

BODY ELECTRICAL

HEADLIGHT AND TAILLIGHT SYSTEM

1410

1997 LEXUS ES300 (RM511U)

COMPONENTS

BE04Y–02

N21562

Hi beam

AUTO

HEAD

TAIL

OFF

Flash

7

8

17

16

14 13

12

N21563

Wire Harness Side

2

1

3 4 5

6

7 8

13 14 15 16

9 10 11 12

17

–

BODY ELECTRICAL

HEADLIGHT AND TAILLIGHT SYSTEM

BE–27

1411

1997 LEXUS ES300 (RM511U)

INSPECTION

1.

INSPECT LIGHT CONTROL SWITCH CONTINUITY

Switch position

Tester connection

Specified condition

OFF

–

No continuity

TAIL

14 – 16

Continuity

HEAD

13 – 14 – 16

Continuity

AUTO

12 – 16

Continuity

If continuity is not as specified, replace the switch.
2.

INSPECT HEADLIGHT DIMMER SWITCH CONTINU-
ITY

Switch position

Tester connection

Specified condition

Low beam

16 – 17

Continuity

High beam

7 – 16

Continuity

Flash

7 – 8 – 16

Continuity

If continuity is not as specified, replace the switch.

3.

INSPECT COMBINATION SWITCH CIRCUIT

Connect the wire harness side connector to the combination
switch and inspect wire harness side connector from the back
side.

Light Control Switch:

Tester connection

Condition

Specified condition

16 – Ground

Constant

Continuity

12 – Ground

Light control switch OFF, TAIL or HEAD

No voltage

12 – Ground

Light control switch AUTO

Battery positive voltage

13 – Ground

Light control switch OFF or TAIL

No voltage

13 – Ground

Light control switch HEAD

Battery positive voltage

14 – Ground

Light control switch OFF

No voltage

14 – Ground

Light control switch TAIL or HEAD

Battery positive voltage

Z09181

3

4

3

4

1

2

2

1

N14863

1

2

3

5

5

3

1

2

N21564

Wire Harness Side

1

2

3

4

5 6

7

8

9 10

h–10–1–A

BE–28

–

BODY ELECTRICAL

HEADLIGHT AND TAILLIGHT SYSTEM

1412

1997 LEXUS ES300 (RM511U)

Headlight Dimmer Switch:

Tester connection

Condition

Specified condition

7 – Ground

Headlight dimmer switch Low Beam

No voltage

7 – Ground

Headlight dimmer switch High Beam or Flash

Battery positive voltage

8 – Ground

Headlight dimmer switch Low Beam or High

Beam

No voltage

8 – Ground

Headlight dimmer switch Flash

Battery positive voltage

17– Ground

Headlight dimmer switch High Beam or Flash

No voltage

17– Ground

Headlight dimmer switch Low Beam

Battery positive voltage

If the circuit is not as specified, inspect the circuit connected to
other parts.

4.

INSPECT HEADLIGHT CONTROL RELAY CONTINU-
ITY

Condition

Tester connection

Specified condition

Constant

3 – 4

Continuity

Apply B+ between

terminals 3 and 4.

1 – 2

Continuity

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

INSPECT HEADLIGHT CONTROL RELAY CIRCUIT
(See page

BE–11

)

6.

INSPECT TAILLIGHT CONTROL RELAY CONTINUITY

Condition

Tester connection

Specified condition

Constant

1 – 2

Continuity

Apply B+ between

terminals 1 and 2.

3 – 5

Continuity

If continuity is not as specified, replace the relay.
7.

INSPECT TAILLIGHT CONTROL RELAY CIRCUIT
(See page

BE–27

)

8.

INSPECT DAYTIME RUNNING LIGHT RELAY CIRCUIT

Disconnect the connector from the relay and inspect the con-
nector on the wire harness side.

Z08523

1

2

3

4

1

2

3

4

N14863

1

2

3

5

5

2

3

1

–

BODY ELECTRICAL

HEADLIGHT AND TAILLIGHT SYSTEM

BE–29

1413

1997 LEXUS ES300 (RM511U)

Tester connection

Condition

Specified condition

2 – Ground

Light control switch position OFF or TAIL

No continuity

2 – Ground

Light control switch position HEAD

Continuity

4 – Ground

Parking brake switch position OFF

(Parking brake lever released)

No continuity

4 – Ground

Parking brake switch position ON

(Parking brake lever pulled up)

Continuity

6 – Ground

Constant

Continuity

8 – Ground

Headlight dimmer switch position

Low beam

No continuity

8 – Ground

Headlight dimmer switch position

High beam or Flash

Continuity

10 – Ground

Brake fluid level warning switch position OFF

No continuity

10 – Ground

Brake fluid level warning switch position ON

Continuity

1 – Ground

Ignition switch position LOCK or ACC

No voltage

1 – Ground

Ignition switch position ON or START

Battery positive voltage

5 – Ground

Engine Stop

No voltage

5 – Ground

Engine Running

Battery positive voltage

7 – Ground

Constant

Battery positive voltage

9 – Ground

Constant

Battery positive voltage

If circuit is as specified, try replacing the relay with a new one.
If circuit is not as specified, inspect the circuits connected to oth-
er parts.

9.

INSPECT HEADLIGHT DIMMER RELAY CONTINUITY

Condition

Tester connection

Specified condition

Constant

1 – 4, 2 – 4

Continuity

Apply B+ between

terminals 2 and 4.

3 – 4

Continuity

If continuity is not as specified, replace the relay.
10.

INSPECT HEADLIGHT DIMMER RELAY CIRCUIT
(See page

BE–11

)

11.

INSPECT DAYTIME RUNNING LIGHT NO.3 RELAY
CONTINUITY

Condition

Tester connection

Specified condition

Constant

1 – 2

Continuity

Apply B+ between

terminals 1 and 2.

3 – 5

Continuity

If continuity is not as specified, replace the relay.