Lexus ES300 (1997 year). Manual — part 241

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.

N12998

Clockwise

Counterclockwise

Z14888

Wire Harness Side

1 2 3 4 5 6 7 8

h–8–1–D

–

BODY ELECTRICAL

HEADLIGHT AND TAILLIGHT SYSTEM

BE–31

1415

1997 LEXUS ES300 (RM511U)

18.

INSPECT LIGHT–OFF CONDITION

(a)

Turn the ignition switch ON.

(b)

Gradually cover the top of the sensor.
Lights auto ON:

(c)

Verify that the lights will go out when light control switch
position is OFF or the area surrounding the sensor gets
bright or open the driver’s door while the ignition switch is
OFF.

19.

INSPECT LIGHTS–ON CONDITION

(a)

Open the driver’s door while the ignition switch is OFF.

(b)

Turn the light control switch to AUTO leaving the door
open and cover the top of the sensor, and verify that the
lights go on when the ignition switch is turned ON.

20.

ADJUST AUTOMATIC LIGHT CONTROL SENSOR

(a)

Adjustment of the light control is performed by turning the
sensitivity knob on the sensor.

(b)

This will determine at what light condition the automatic
control will take place.

If response is too quick, turn the knob counterclock-
wise.

If response is too slow, turn the knob clockwise.

21.

Connector disconnected:
INSPECT SENSOR CIRCUIT

Disconnect the connector from the sensor and inspect the con-
nector on the wire harness side, as shown in the chart.

Tester connection

Condition

Specified condition

3 – Ground

Door courtesy switch OFF

No continuity

3 – Ground

Door courtesy switch ON

Continuity

5 – Ground

Light control switch OFF, TAIL or AUTO

No continuity

5 – Ground

Light control switch HEAD

Continuity

6 – Ground

Light control switch OFF, TAIL or HEAD

No continuity

6 – Ground

Light control switch AUTO

Continuity

7 – Ground

Light Control Switch OFF or AUTO

No continuity

7 – Ground

Light Control Switch TAIL or HEAD

Continuity