Service Indicator Inoperative

Service Indicator Inoperative

Circuit Description
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.

Steps 1-4:

Test Description
This number corresponds to the step number on the diagnostic table.
2. This step determines whether the failure is the result of a faulty transfer case shift control module or the instrument cluster.