Lexus ES300 (1997 year). Manual — part 114

V08431

ALL METERS, GAUGES, AND
ILLUMINATIONS

ALL METERS, GAUGES, AND
ILLUMINATIONS

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

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

Replace circuit plate. Then recheck system.

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

No

Yes

4

5

Brightness does not change even
when light control switch is operated.
(OFF

↔

TAIL)

Brightness does not change even when
rheostat volume is turned.

RHEOSTAT LIGHT
CONTROL VOLUME

COMBINATION
METER

COMBINATION
METER

Yes

No

Yes

No

INSPECT TAILLIGHT SIGNAL CIRCUIT

Does voltage change between terminal B8 and
ground as follows?

Taillight signal circuit faulty on vehicle side.
Inspect illumination light system.

Battery positive voltage

Replace rheostat light control volume.
Then recheck system.

Wire harness faulty between terminal D1 of meter
and terminal D2 of rheostat volume and rheostat
light control.

Condition

Voltage

Light control

switch

position

OFF

No voltage

TAIL or HEAD

INSPECT RHEOSTAT LIGHT CONTROL VOLUME

(See page BE–)

Is operation normal?

Connect connector to rheostat volume.

Disconnect connector ”D” from meter.

Inspect connector on wire harness side as follows.

Turn ignition switch ON. Does voltage change

evenly between terminal D1 and D2 when rheostat

knob is turned?

Replace circuit plate. Then recheck system.

BE–62

–

BODY ELECTRICAL

COMBINATION METER

1446

1997 LEXUS ES300 (RM511U)

V08432

ALL METERS, GAUGES, AND
ILLUMINATIONS

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

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

Replace circuit plate. Then recheck system.

6

7

SPEEDOMETER

Does not go out while starter running.

Speedometer does not operate while
driving

Replace circuit plate. Then recheck system.

No

Yes

COMBINATION
METER

Yes

Yes

Yes

No

No

No

Wire harness faulty between terminal B16 of Meter
and ST fuse.

Turn ignition switch START.

Is there battery positive voltage between terminal and

ground or B16?

Does odometer operate while driving?

Does trip meter operate while driving?

CONTINUED ON NEXT PAGE

Jack up the vehicle.

Turn ignition switch ON. Rotate propeller shaft.

Does the voltage between terminals C9 and C10

change (approx. 0V to 11V or more) per revolution of

propeller shaft?

Disconnect connector ”C” 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.

INSPECT TRIP METER OPERATION

INSPECT ODOMETER OPERATION

Replace speedometer.
Then recheck system.

Go to step 7–A

–

BODY ELECTRICAL

COMBINATION METER

BE–63

1447

1997 LEXUS ES300 (RM511U)

V08433

8

SPEEDOMETER

Replace circuit plate. Then recheck system.

COMBINATION
METER

Yes

No

Does odometer operate while driving?

Jack up the vehicle. Turn ignition switch ON.

Rotate propeller shaft. Does the voltage between

terminals C10 and ground change (approx. 0V to 5V

or more) per revolution of propeller shaft?

Disconnect connectors ”A” and ”C” 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.

INSPECT ODOMETER OPERATION

See chart 18.

ECM

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

Replace circuit plate. Then recheck system.

Remove meter with connector connected.
Inspect connector ”C” from back side as follows.

Wire harness between terminal C10 of meter and*ECU

faulty.

Power Steering ECU

* : An electrical tester availble to measure frrequency
is necessary for this inspection.
REFERENCE : TOYOTA ELECTRICAL TESTER
(09082–00050)

Suspension ECU

ABS and TRAC ECU

With engine running, does voltage between terminals

A13 and C10 fluctuate?

Cruise Control ECU

Yes

No

9

Vehicle speed signal (4P) faulty

Tachometer dose not operate while
engine running.

TACHOMETER

Yes

No

* INSPECT TACHOMETER CIRCUIT

Wire harness faulty between terminal A13 of meter
and igniter.

BE–64

–

BODY ELECTRICAL

COMBINATION METER

1448

1997 LEXUS ES300 (RM511U)

V08434

COMBINATION METER

Yes

No

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

Yes

Yes

No

No

No

Is operation normal?

Replace receiver gauge. Then recheck system.

Is there continuity (no resistance ) between terminal

D12 and ground?

Are speedometer and tachometer operating normally?

Replace combination

meter computer.

Then recheck system.

Open circuit in wire

harness between terminal

12 of meter and ground.

Ground faulty.

Wire harness faulty between meter and sender gauge.

Replace sender gauge. Then recheck system.

Is operation normal?

Is resistance normal?

Replace combination meter computer.
Then recheck system.

INSPECT SENDER GAUGE OPERATION
(See page

BE–92

)

INSPECT RECEIVER GAUGE RESISTANCE
(See page

BE–92

)

INSPECT RECEIVER GAUGE OPERATION
(See page

BE–92

)

FUEL GAUGE

Does not operate or operation is
abnormal.

10

Yes

No

–

BODY ELECTRICAL

COMBINATION METER

BE–65

1449

1997 LEXUS ES300 (RM511U)