Lexus ES300 (1997 year). Manual — part 259

Z15790

Warning Light

Wire Harness Side

Ignition
Switch

Battery

5

7

9 10 11 12

4

6

8

2 3

1

Z07425

Wire Harness Side

1 2 3

4 5

6 7 8 9 10 11 12

BE0044

Warning Light

Ignition
Switch

Battery

BE–100

–

BODY ELECTRICAL

COMBINATION METER

1484

1997 LEXUS ES300 (RM511U)

23.

INSPECT WARNING LIGHT

(a)

Disconnect the connector from the light failure sensor and
ground terminal 4 on the wire harness side connector.

(b)

Start the engine, check that the warning light lights up.

If the warning light does not light up, test the bulb or inspect wire
harness.

24.

INSPECT LIGHT FAILURE SENSOR CIRCUIT

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

Tester connection

Condition

Specified condition

1 – Ground

Constant

Continuity*

2 – Ground

Constant

Continuity*

9 – Ground

Constant

Continuity*

10 – Ground

Constant

Continuity*

11 – Ground

Constant

Continuity*

12 – Ground

Constant

Continuity*

3 – Ground

Light control switch OFF

No voltage

3 – Ground

Light control switch TAIL or HEAD

Battery positive voltage

4.8 – Ground

Ignition switch LOCK or ACC

No voltage

4.8 – Ground

Ignition switch ON

Battery positive voltage

7 – Ground

Stop light switch OFF

No voltage

7 – Ground

Stop light switch ON

Battery positive voltage

*: There is resistance because this circuit is grounded through
the bulb.
If the circuit is as specified, replace the sensor. If the circuit is
not as specified, inspect the circuits connected to other parts.

25.

INSPECT SEAT BELT WARNING LIGHT

(a)

Remove the integration relay from the instrument panel
junction block.

(b)

Ground terminal 2 on the integration relay with the con-
nectors still connected.

(c)

Turn the ignition switch ON and check that the warning
light lights up.

If the warning light does not light up, inspect the bulb or wire har-
ness.

N19262

ON

1

2

OFF

N21309

Wire Harness Side

1 2

h–2–1–A

N21311

10

9

7

1

–

BODY ELECTRICAL

COMBINATION METER

BE–101

1485

1997 LEXUS ES300 (RM511U)

26.

INSPECT BUCKLE SWITCH CONTINUITY

(a)

Check that continuity exists between terminals 1 and 2 on
the switch side connector with the switch ON (belt fas-
tened).

(b)

Check that no continuity exists between terminals 1 and
2 on the switch side connector with the switch OFF (belt
unfastened).

If operation is not as specified, replace the front seat inner belt.

27.

INSPECT BUCKLE SWITCH CIRCUIT

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

Tester connection

Condition

Specified condition

2 – Ground

Constant

Continuity

–

Turn the ignition switch ON

Chime sounds for 4 – 8 sec.

–

Ground terminal 1 and turn the ignition switch ON

No chime sound

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

28.

INSPECT INTEGRATION RELAY SEAT BELT WARN-
ING SYSTEM OPERATION

(a)

Connect the positive (+) lead from the battery to terminals
1 and 7.

(b)

Connect the terminal 7 to terminal 9 through the 3.4 W test
bulb.

(c)

Connect the negative (–) lead from the battery to terminal
10.

(d)

Check that the bulb lights and the buzzer sounds for 4 to
8 seconds.

(e)

Return to step (a) and operate the chime again.

N21312

10

9

8

7

1

N21313

1

2

3

4

5

6

7

8

9

10

11

12

Z13911

Below 40

°

C

(104

°

F)

2

1

BE–102

–

BODY ELECTRICAL

COMBINATION METER

1486

1997 LEXUS ES300 (RM511U)

(f)

Connect the negative (–) lead from the battery to terminal
8.

(g)

Check that the buzzer stops sounding.

HINT:
Check the buzzer within a period of 4 to 8 seconds.
If operation is not as specified, replace the relay.

29.

Seat belt warning :
INSPECT INTEGRATION RELAY CIRCUIT

Remove the relay from the junction block No.1 and inspect the
connectors on the junction block side.

Tester connection

Condition

Specified condition

8 – Ground

Driver’s buckle switch OFF

(Seat best unfastened)

No continuity

8 – Ground

Driver’s buckle switch ON

(Seat best fastened)

Continuity

10 – Ground

Constant

Continuity

1 – Ground

Constant

Battery positive voltage

7 – Ground

9 – Ground

Ignition switch position OFF or ACC

No voltage

7 – Ground

9 – Ground

Ignition switch position ON

Battery positive voltage

If the circuit is as specified, try to replace the relay with a new
one.
If the circuit is not as specified, inspect the circuits connected
to other parts.

30.

INSPECT ENGINE OIL LEVEL WARNING SWITCH
CONTINUITY

(a)

Check that continuity exists between terminal with the
switch in each position.

(b)

Heat the switch to above 60

°

C (140

°

F) in an oil bath.

Z13912

Above 60

°

C

(140

°

F)

2

OFF

1

ON

Z05733

Wire Harness Side

1 2

ls–2–1–D

I03031

Ignition
Switch

Battery

Warning Light

1 2

Z09972

(a)

(b)

A

B

C

A

C

B

–

BODY ELECTRICAL

COMBINATION METER

BE–103

1487

1997 LEXUS ES300 (RM511U)

(c)

Check that continuity exists between terminals with the
switch ON (float up).

(d)

Check that no continuity exists between terminals with the
switch OFF (float down).

If operation is not as specified, replace the switch.

31.

INSPECT ENGINE OIL LEVEL WARNING SWITCH CIR-
CUIT

Disconnect the switch connector and inspect the connector on
wire harness side.

Tester connection

Condition

Specified condition

2 – Ground

Constant

Continuity

If continuity is not as specified, inspect the wire harness or
ground point.

32.

INSPECT ENGINE OIL LEVEL WARNING LIGHT

(a)

Disconnect the connector from the switch.

(b)

Turn the IG switch ON, the warning light lights up.

(c)

The warning light lights up after 40 sec. from the engine
has started.

If the warning light does not light up, inspect bulb or wire har-
ness.
33.

INSPECT LIGHT CONTROL RHEOSTAT
(See page

BE–43

)

34.

INSPECT BULB CHECK RELAY OPERATION

(a)

Connect the positive (+) lead from the battery to terminal
C through a 1.4–W test bulb and the negative (–) lead to
terminal B, check that the test bulb does not light up.

(b)

Connect the positive (+) lead from the battery to terminal
A and check that the test bulb lights up.

If operation is not as specified, replace the relay.