The SERVICE 4WD indicator is located in the instrument panel cluster (IPC), and shares the common power and ground of the IPC. The transfer case shift control module controls the service indicator by sending the IPC a Class 2 message. This indicator may be controlled with the scan tool using the IPC device controls.
The number below refers to the step number on the diagnostic table.
Step | Action | Yes | No |
---|---|---|---|
Schematic Reference: Transfer Case Control Schematics Connector End View Reference: Transfer Case Control Connector End Views | |||
1 | Did you perform the Diagnostic System Check - Transfer Case? | Go to Step 2 | |
Does the SERVICE 4WD Lamp turn OFF? | Go to Step 3 | Go to Diagnostic System Check - Instrument Cluster in Instrument Panel, Gages, and Console | |
3 | Replace the transfer case shift control module. Refer to Transfer Case Shift Control Module Replacement and Transfer Case Shift Control Module Reprogramming . Did you complete the repair? | Go to Step 4 | -- |
4 |
Does the symptom occur? | Go to Step 2 | System OK |