Circuit/System Description
WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
The neutral indicator circuit consists of an ignition 1 voltage circuit and a neutral indicator control circuit. When the neutral mode has been selected, current is supplied to the neutral indicator by the ignition 1 voltage circuit, traveling through the neutral indicator LED, at which time the transfer case shift control module supplies the ground through the neutral indicator control circuit.