Lexus ES300 (1997 year). Service manual - part 183

V08436

Disconnect connector ”A” from meter.
Inspect connector on wire harness side.

HINT : While carrying out the following inspection, make certain that the connectors and terminals are properly con-
nected.

Yes

No

Wire harness faulty between terminal A1 of meter
and ground.

No

No

No

No

Yes

Yes

INSPECT RECEIVER GAUGE OPERATION
(See page 

BE–92

)

Yes

Yes

INSPECT RECEIVER GAUGE RESISTANCE
(See page 

BE–92

)

Wire harness faulty between terminal A3 of meter
and sender gauge.

Sender gauge ground condition faulty.

Replace sender gauge. Then recheck system.

INSPECT SENDER GAUGE GROUND CONDITION

Is there continuity (no resistance) between gauge
body and engine block?

Is resistance normal?

Is there continuity between terminal A3 and ground?

Replace receiver gauge. Then recheck system.

Is there continuity between terminal A1 and ground?

Replace combination meter computer.
Then recheck system.

COMBINATION
METER

12

ENGINE COOLANT TEMPERATURE
GAUGE

Does not operate or operation is
abnormal.

Is operation normal?

–

BODY ELECTRICAL

COMBINATION METER

BE–67

1451

1997 LEXUS ES300   (RM511U)

V08437

Disconnect connector ”D” from meter.
Inspect connector on wire harness side as follows.

HINT : While carrying out the following inspection, make certain that the connectors and terminals are properly con-
nected.

Yes

Wire harness faulty between terminal B3 of meter
and terminal 1 of low oil pressure warning switch.

No

COMBINATION
METER

13

LOW OIL PRESSURE WARNING

Abnormal operation or warning light
does not light up.

Is GAUGE fuse normal?

Replace fuse. Then recheck system.

Open circuit in wire harness between GAUGE fuse
and meter.

Connect connector ”D” to meter.
Disconnect connector ”B” from meter.
Inspect connector on combination meter side as
follows.

Ground terminal B3 and turn ignition switch ON.
Does low oil pressure warning light light up?

Temporarily install another circuit plate.
Is operation normal?

Turn ignition switch ON.
Is there battery positive voltage between terminal
D3 and ground?

Is bulb OK?

Replace bulb.
Then recheck system.

Replace circuit plate.

Replace combination
meter computer.
Then recheck system.

INSPECT LOW OIL PRESSURE WARNING LIGHT

(See page 

BE–92

)

INSPECT LOW OIL PRESSURE WARNING SWITCH

(See page 

BE–92

)

No

No

No

No

No

Yes

Yes

Yes

Yes

Yes

If operation is not as specified, replace the switch.
Then recheck system.

Is operation normal?

BE–68

–

BODY ELECTRICAL

COMBINATION METER

1452

1997 LEXUS ES300   (RM511U)

V08438

Disconnect connector ”D” from meter.
Inspect connector on wire harness side as follows.

HINT : While carrying out the following inspection, make certain that the connectors and terminals are properly con-
nected.

Yes

Wire harness faulty between terminal A9 of meter and

1  Terminal 1 of parking brake switch.

2  Terminal 1 of brake fluid level warning switch.

No

COMBINATION
METER

Abnormal operation or warning light
does not light up.

Is GAUGE fuse normal?

Replace fuse. Then recheck system.

Open circuit in wire harness between GAUGE fuse
and meter.

Connect connector ”D” to meter.
Disconnect connector ”A” from meter.
Inspect connector on combination meter side as
follows.

Ground terminal A9 and turn ignition switch ON.
Does brake warning light light up?

Temporarily install another circuit plate.
Is operation normal?

Turn ignition switch ON.
Is there battery positive voltage between terminal
D3 and ground?

Is bulb OK?

Replace bulb.
Then recheck system.

Replace circuit plate.

Replace combination
meter computer.
Then recheck system.

INSPECT BRAKE WARNING LIGHT
(See page 

BE–92

)

INSPECT PARKING BRAKE SWITCH
(See page 

BE–92

)

No

No

No

Yes

Yes

If operation is not as specified, replace the switch.
Then recheck system.

Is operation normal?

INSPECT BRAKE FLUID LEVEL WARNING SWITCH

(See page 

BE–92

)

Is operation normal?

Yes

Yes

No

No

Yes

Yes

No

14

BRAKE WARNING

Replace brake fluid level warning switch.
Then recheck system.

–

BODY ELECTRICAL

COMBINATION METER

BE–69

1453

1997 LEXUS ES300   (RM511U)

V08439

Disconnect connector ”D” from meter.
Inspect connector on wire harness side as follows.

HINT : While carrying out the following inspection, make certain that the connectors and terminals are properly con-
nected.

Yes

No

COMBINATION
METER

Abnormal operation or warning light
does not light up.

Is GAUGE fuse normal?

Replace fuse. Then recheck system.

Open circuit in wire harness between GAUGE fuse
and meter.

Connect connector ”D” to meter.
Disconnect connector ”A” from meter.
Inspect connector on combination meter side as
follows.

Ground terminal A7 and turn ignition switch ON.
Does light failure warning light light up?

Temporarily install another circuit plate.
Is operation normal?

Turn ignition switch ON.
Is there battery positive voltage between terminal
D3 and ground?

Is bulb OK?

Replace bulb.
Then recheck system.

Replace circuit plate.

Replace combination
meter computer.
Then recheck system.

INSPECT LIGHT FAILURE SENSOR CIRCUIT
(See page 

BE–92

)

No

No

No

Yes

Yes

Yes

Yes

No

REAR LIGHTS WARNING

15

If circuit is as specified, replace the sensor.
Then recheck system.

BE–70

–

BODY ELECTRICAL

COMBINATION METER

1454

1997 LEXUS ES300   (RM511U)