Lexus RX300 (MCU15). Manual — part 329

DI–548

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DIAGNOSTICS

COMBINATION METER SYSTEM

LEXUS RX300 (RM785E)

When not using hand–held tester:

1

Check harness and connector between combination meter and Engine & ECT
ECU (See page IN–32).

NG

Repair or replace harness or connector.

OK

2

Check igniter circuit

(See page DI–96).

OK

Replace combination meter.

NG

Check and repair ignition coil and wire har-
ness.

I07345

Wire Harness Side

IG1

+B

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DIAGNOSTICS

COMBINATION METER SYSTEM

DI–549

LEXUS RX300 (RM785E)

Combination Meter ECU Power Source Circuit

INSPECTION PROCEDURE

1

Check fuses. (HEATER and ECU–B fuse)

NG

Replace fuse.

OK

2

Check voltage between terminals +B and of combination meter connector and
body ground.

PREPARATION:
(a)

Remove combination meter.

(b)

Disconnect the combination meter connector.

CHECK:
Measure voltage between terminals, +B, and IG1 of combina-
tion meter connector and body ground.
OK:

Voltage: 10 – 14 V

OK

Proceed to next circuit inspection shown on
problem symptom table (See page DI–539).

NG

3

Check for open in harness and connector between terminal GND of combination
meter and body ground. (See page IN–32).

NG

Repair or replace harness or connector.

OK

DI1RH–04

DI–550

–

DIAGNOSTICS

COMBINATION METER SYSTEM

LEXUS RX300 (RM785E)

Check and repair harness and connector be-
tween combination meter and battery.

I04205

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DIAGNOSTICS

COMBINATION METER SYSTEM

DI–551

LEXUS RX300 (RM785E)

Bulb Circuit

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 light turns ON or OFF as the hand–held tester directs.

HINT:
All lights flush except shift indicator.

OK

Proceed to next circuit inspection shown on
problem symptom table. (See page DI–539).

NG

2

Check bulb.

CHECK:
Apply the tester as shown to test for continuity.
OK:

Continuity

NG

Replace bulb.

OK

DI1RI–04