Pinpoint Test J: The Four-Wheel Drive (4WD) Indicators Do Not Operate Correctly/Do Not Operate

Four Wheel Drive (4WD) Systems - 1-Speed Torque-On-Demand

Pinpoint Test J: The Four-Wheel Drive (4WD) Indicators Do Not Operate Correctly/Do Not Operate

Refer to Wiring Diagram Set 34, Four-Wheel Drive System for schematic and connector information Electrical Diagrams.

Normal Operation

The Four-Wheel Drive (4WD) system status is transmitted to the Instrument Cluster (IC) from the Transfer Case Control Module (TCCM) through the High Speed Controller Area Network (HS-CAN) to the powertrain malfunction indicator. A steady indicator displays if the vehicle is in AUTO or 4X4 mode, according to the driver selection. When in 2-Wheel Drive (2WD), the message center will display 4X2 for approximately 4 seconds, then the message center will no longer provide 4WD (Four-Wheel Drive) system indication until another shift mode is attained. A 4WD (Four-Wheel Drive) system fault condition will illuminate the powertrain malfunction indicator. The powertrain malfunction indicator includes other general powertrain system failures. For information about HS-CAN (High Speed Controller Area Network), refer to Information Bus.

This pinpoint test is intended to diagnose the following:

- IC (Instrument Cluster)

- 4WD (Four-Wheel Drive) system fault

- HS-CAN (High Speed Controller Area Network) circuits

- TCCM (Transfer Case Control Module)

PINPOINT TEST J : THE Four-Wheel Drive (4WD) INDICATORS DO NOT OPERATE CORRECTLY/DO NOT OPERATE

J1 CHECK FOR TCCM (Transfer Case Control Module) DTCs

- Ignition ON.

- Enter the following diagnostic mode on the scan tool: Self-Test- TCCM (Transfer Case Control Module).

Are DTCs present?

Yes
REFER to the Transfer Case Control Module (TCCM) DTC Chart. Four Wheel Drive (4WD) Systems - 1-Speed Torque-on-Demand

No
GO to J2.

J2 CHECK FOR IC (Instrument Cluster) DTCs

- Ignition ON.

- Enter the following diagnostic mode on the scan tool: Self-Test- IC (Instrument Cluster).

Are DTCs present?

Yes
REFER to Instrument Panel, Gauges and Warning Indicators.

No
GO to J3.

J3 CHECK 4WD (Four-Wheel Drive) SYSTEM OPERATION

- Test drive the vehicle and operate the 4WD (Four-Wheel Drive) system.

Does the 4WD (Four-Wheel Drive) system operate correctly?

Yes
REFER to Instrument Panel, Gauges and Warning Indicators.

No
GO to Symptom Chart - Four Wheel Drive (4WD). Four Wheel Drive (4WD) Systems - 1-Speed Torque-on-Demand