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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> Transmission >> Transfer Case >> Transfer Case - NVG 136-NP4 >> Diagnostic Information and Procedures >> Service Indicator Always On >> Circuit Description

Circuit Description

The SERVICE AWD indicator is located in the instrument cluster. It receives ignition voltage through the instrument cluster 10 amp gage fuse through the ignition 1 voltage circuit. This circuit also supplies all of the gages with ignition voltage. The transfer case shift control module controls the SERVICE AWD indicator by sending the instrument cluster a Class 2 message. This indicator may be controlled with the scan tool using the instrument cluster output controls.