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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 902 (Transfer Case - NVG 233-NP1 (Two Speed SELECTABLE)) >> Diagnostic Information and Procedures >> Transfer Case Shift Control Switch Indicator Inoperative - One or More >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2003 GMC Sonoma, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.

The indicator lamps circuit consists of 3 individual lamps contained inside respective buttons. This assembly is the transfer case shift-control switch, with the following indicators:

When the ignition switch is placed in the RUN position, current is provided to the switch assembly. The transfer case shift control module provides a ground for the indicators when a particular gear is active or when the transfer case is in transition. Through solid state circuity located inside the switch assembly voltage can be regulated to provide less illumination when the headlamps or parking lights are turned ON.