Lexus RX300 (MCU15). Service manual - part 327

DI–540

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DIAGNOSTICS

COMBINATION METER SYSTEM

LEXUS RX300   (RM785E)

Washer level warning light does not light up.

1. Bulb circuit

2. Window washer level warning switch

3. Combination meter

DI–551

BE–68

IN–32

Rear Lights warning light does not light up.

1. Bulb circuit

2. Light failure relay

3. Combination meter

DI–551

BE–68

IN–32

Engine oil level warning light does not light up.

1. Bulb circuit

2. Engine oil level warning sensor

3. Combination meter

DI–551

BE–68

IN–32

Any indicator lights does not light up.

1. Bulb circuit

2. Combination meter ECU power source circuit

3. Combination meter

DI–551

DI–549

IN–32

DI1RB–04

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DIAGNOSTICS

COMBINATION METER SYSTEM

DI–541

LEXUS RX300   (RM785E)

CIRCUIT INSPECTION

Speedometer

INSPECTION PROCEDURE

HINT:
If there is not the hand–held tester, begin with STEP 2.

1

Perform active test.

PREPARATION:
Connect the hand–held tester to the DLC3.
CHECK:
(a)

Enter into ACTIVE TEST function of hand–held tester.

(b)

Check that the probe moves as hand–held tester directs in each range.

OK:
The meter operates normally.

OK

Replace A/C and combination meter intagrated
ECU.

NG

2

Is any of DTC 31 to 35 output from ABS system?

Check DTC on page DI–205.

YES

Repair circuit indicated by output code.

NO

3

Check for open or short circuit in harness and connector between A/C and com-
bination meter integrated ECU and ABS & BA & TRC & VSC ECU.

NG

Repair or replace harness or connector.

OK

DI–542

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DIAGNOSTICS

COMBINATION METER SYSTEM

LEXUS RX300   (RM785E)

4

Check speedometer (See page BE–68).

NG

Replace speedometer.

OK

Check and replace combination meter
circuit plate.

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DIAGNOSTICS

COMBINATION METER SYSTEM

DI–543

LEXUS RX300   (RM785E)

Tachometer

INSPECTION PROCEDURE

HINT:
If there is not the hand–held tester, begin with STEP 2.

1

Perform active test.

PREPARATION:
Connect the hand–held tester to the DLC3.
CHECK:
(a)

Enter into ACTIVE TEST function of hand–held tester.

(b)

Check that the probe moves as hand–held tester directs in each range.

OK:
The meter operates normally.

OK

Replace A/C and combination meter intagrated
ECU.

NG

2

Check igniter signal circuit (See page DI–547).

NG

Check and repair igniter signal circuit.

OK

3

Check tachometer (See page BE–68).

NG

Replace tachometer.

OK

Check and replace combination meter circuit
plate.

DI1RC–04