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

Regarding Wiring Diagram information, [1][2]Electrical Diagrams.

1. CHECK TRANSFER CONTROL UNIT POWER SUPPLY AND GROUND

Check transfer control unit power supply and ground circuits. P1801.
OK or NG
OK- GO TO 2.
NG- Repair as necessary.

2. CHECK COMBINATION METER POWER SUPPLY AND GROUND

Check combination meter power supply and ground circuits. Combination Meter.
OK or NG
OK - GO TO 3.
NG- Repair as necessary.

3. CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND COMBINATION METER

1.Turn ignition switch OFF. (Stay for at least 5 seconds.)





2.Check continuity between transfer control unit harness connector E143 terminal 38 and combination meter harness connector
M24 terminal 34.
Continuity should exist.
Also check harness for short to ground and short to power.
OK or NG
OK - GO TO 4.
NG- Repair or replace damaged parts.

4. CHECK COMBINATION METER

1.Turn ignition switch OFF. (Stay for at least 5 seconds.)
2.Check the combination meter. Meter.
OK or NG
OK- GO TO 5.
NG- Replace the combination meter. Service and Repair.

5. SYMPTOM CHECK

Check again.
OK or NG
OK- Inspection End.
NG- GO TO 6.

6. CHECK TRANSFER CONTROL UNIT

Check transfer control unit input/output signal. Pinout Values and Diagnostic Parameters.
OK or NG
OK- Inspection End.
NG- Check transfer control unit pin terminals for damage or loose connection with harness connector.
If any items are damaged, repair or replace damaged parts.