The SERVICE 4WD indicator is located in the instrument cluster. It receives ignition voltage from a 10 amp gage fuse through the instrument cluster feed circuit. This circuit also supplies all of the gages with ignition voltage. The transfer case shift control module controls the SERVICE 4WD indicator by sending the instrument cluster a Class 2 message. This lamp may be controlled with the scan tool using the instrument cluster 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 indicator turn OFF? | Go to Step 3 | Go to Instrument Cluster Replacement in Instrument Panel, Gages and Console | |
3 | Replace the transfer case shift control module. Refer to Transfer Case Shift Control Module Replacement . Did you complete the repair? | Go to Step 4 | -- |
4 |
Does the symptom to occur? | Go to Step 2 | System OK |