Section 180 (System Wiring Diagrams - 2500 Hd): Radio

WARNING: This page is about a different car, the 2002 GMC Sierra. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Radio Circuit, Base Crew Cab

Fig 2: Radio Circuit, Base

Fig 3: Radio Circuit, Up Level W/ OnStar

Fig 4: Radio Circuit, Up Level W/O OnStar