4WD Warning Lamp Does Not Turn On

4WD WARNING LAMP DOES NOT TURN ON

Description
4WD warning lamp does not turn ON when turning ignition switch to ON.

Diagnosis Procedure

1. CHECK TRANSFER CONTROL UNIT POWER SUPPLY AND GROUND CIRCUITS
Refer to DLN-21, "Diagnosis Procedure". P1811
Are the inspection results normal?
YES >> GO TO 2.
NO >> Repair as necessary.

2. CHECK COMBINATION METER POWER SUPPLY AND GROUND CIRCUITS
Refer to MWI-30, "COMBINATION METER: Diagnosis Procedure". Power Supply and Ground Circuit
Are the inspection results normal?
YES >> GO TO 3.
NO >> Perform repairs as necessary.

3. CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND COMBINATION METER
1. Turn ignition switch OFF. (Stay for at least 5 seconds.)
2. Disconnect transfer control unit and combination meter harness connectors.





3. Check continuity between the following terminals.
- Transfer control unit harness connector E142 (A) terminal 5 and combination meter harness connector M23 (B) terminal 49.
Continuity should exist.
Also check harness for short to ground and short to power.
Are the inspection results normal?
YES >> GO TO 4.
NO >> Repair or replace damaged parts.

4. CHECK INDICATOR LAMP CIRCUIT
1. Connect combination meter harness connector.
2. Turn ignition switch ON. (Do not start engine.)





3. Ground the following terminal using suitable wiring.
- Transfer control unit harness connector E142 terminal 5 and ground.
Does 4WD warning lamp turn on?
YES >> GO TO 5.
NO >> Replace combination meter.

5. SYMPTOM CHECK
Check again.
Are the inspection results normal?
YES >> Inspection End.
NO >> GO TO 6.

6. CHECK TRANSFER CONTROL UNIT
Check transfer control unit input/output signal. Refer to DLN-79, "Reference Value". Reference Value
Are the inspection results normal?
YES >> Inspection End.
NO >> Check transfer control unit pin terminals for damage or loose connection with harness connector. If any items are damaged, repair or replace damaged parts.