Lexus ES300 (1997 year). Manual - part 173

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.

Z08559

2

1

3

4

4

3

2

1

BE1838

BE1840

N21565

N21566

BE–30

–

BODY ELECTRICAL

HEADLIGHT AND TAILLIGHT SYSTEM

1414

1997 LEXUS ES300   (RM511U)

12.

INSPECT DAYTIME RUNNING LIGHT NO.3 RELAY
CIRCUIT
(See page 

BE–11

)

13.

INSPECT DAYTIME RUNNING LIGHT NO.4 RELAY
CONTINUITY

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.
14.

INSPECT DAYTIME RUNNING LIGHT NO.4 RELAY
CIRCUIT
(See page 

BE–11

)

15.

INSPECT LIGHT AUTO TURN OFF SYSTEM
(See Integration relay circuit on page 

BE–20

)

16.

Auto ON:
INSPECT AUTOMATIC LIGHT CONTROL

(a)

Turn the ignition switch ON.

(b)

Turn the light control switch to AUTO.

(c)

Gradually cover the top of the sensor.

(d)

Verify that the accessory lights and the headlights turn
ON.

17.

Auto OFF:
INSPECT AUTOMATIC LIGHT CONTROL

(a)

Gradually expose the sensor.

(b)

Verify that the headlights and the accessory lights turn
OFF.