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.




4WD WARNING LAMP DOES NOT TURN ON


Diagnosis Procedure

1.CHECK TRANSFER CONTROL UNIT POWER SUPPLY AND GROUND CIRCUITS
Refer to P1811.
Are the inspection results normal?
YES - GO TO 2.
NO - Repair as necessary.
2.CHECK COMBINATION METER POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF. (Stay for at least 5 seconds.)
2. Disconnect combination meter harness connector.





3. Check voltage between combination meter harness connector terminal and ground.










4. Turn ignition switch ON. (Do not start engine.)
5. Check voltage between combination meter harness connector terminal and ground.





Are the inspection results normal?
YES - GO TO 3.
NO - Check the following. If any items are damaged, repair or replace damaged parts.
- 10A fuse [No. 14 located in the fuse block (J/B)].
- Harness for short or open between battery and combination meter harness connector M24 terminal 24.
- Ignition switch.
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 harness connector.





3. Check continuity between the following terminals.
- Transfer control unit harness connector E142 terminal 5 and combination meter harness connector M24 terminal 34.

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. Refer to Service and Repair.
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 Pinout Values and Diagnostic Parameters.
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.