4WD Shift Indicator Lamp and 4Lo Indicator Lamp Do Not Turn On

4WD Shift Indicator Lamp and 4Lo Indicator Lamp Do Not Turn On

Description

4WD shift indicator lamp and 4LO indicator lamp do not turn ON for approx. 1 second when turning ignition switch to ON.

Diagnosis Procedure

Regarding Wiring Diagram information, refer to [Transfer Control Unit: Wiring Diagram] [1][2]Electrical Diagrams.

1. CHECK TRANSFER CONTROL UNIT POWER SUPPLY AND GROUND CIRCUITS

Refer to [P1801, P1811 Power Supply Circuit for Transfer Control Unit] P1801.

Are the inspection results normal?
YES
GO TO 2.
NO
Perform repairs 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 terminals and ground.











4 Turn ignition switch "ON". (Do not start engine.)





5 Check voltage between combination meter harness connector terminals 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.

- 10 A fuse [No. 14, located in the fuse block (J/B)] or ignition switch.
- Harness for short or open between ignition switch and combination meter harness connector terminal 16

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 the following terminals.





- Transfer control unit harness connector M153 terminal 35 and combination meter harness connector M24 terminal 30.
- Transfer control unit harness connector M153 terminal 36 and combination meter harness connector M24 terminal 27.
- Transfer control unit harness connector M153 terminal 37 and combination meter harness connector M24 terminal 29.






Also check harness for short to ground and short to power.

Does continuity exist?
YES
GO TO 4.
NO
Repair or replace damaged parts.

4. CHECK INDICATOR LAMP CIRCUIT

1 Turn ignition switch "OFF". (Stay for at least 5 seconds.)
2 Connect combination meter harness connector.
3 Disconnect transfer control unit harness connector.
4 Turn ignition switch "ON". (Do not start engine.)
5 Ground the following terminals using suitable wiring.





- Transfer control unit harness connector M153 terminal 35 and ground.
- Transfer control unit harness connector M153 terminal 36 and ground.
- Transfer control unit harness connector M153 terminal 37 and ground.

Do indicator lamps turn on?
YES
GO TO 5.
NO
Replace the combination meter. Refer to [Combination Meter: Removal and Installation] Service and Repair.

5. SYMPTOM CHECK

Check again.

Does the symptom still occur?
YES
GO TO 6.
NO
Inspection End.

6. CHECK TRANSFER CONTROL UNIT

Check transfer control unit input/output signal. Refer to [Transfer Control Unit: Reference Value] 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.