B0768

Circuit Description
The Transfer Case Shift Control Module controls the SERVICE indicator (AWD/4WD) lamp, located in the Instrument Cluster, by grounding circuit 1567. Voltage to the lamp is supplied via the Gauge Fuse, circuit 39. The fuse is located in the I/P Fuse Block.

Conditions for Setting the DTC
After the Transfer Case Shift Control Module commands the lamp on, the module senses a voltage greater than 7V on circuit 1567.

Conditions for Clearing the DTC
- The Transfer Case Shift Control Module will clear the DTC if the condition for setting the DTC no longer exists.
- A history DTC will clear after 100 consecutive ignition cycles without a fault present.
- Use a scan tool in order to clear history DTCs.

Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
3. This step determines whether circuit 1567 is shorted to voltage.
6. Jumping terminal E2 of the transfer case shift control module harness connector to ground should provide a complete path to ground for the Service 4WD lamp. This step attempts to eliminate the instrument cluster and wiring from fault.





DTC B0768 Service Indicator Circuit High