Radio/Audio System Schematics (UQ7 W/O Y91)
WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Radio/Audio System Schematics (UQ7 W/O Y91) (Power, Ground, Audio Signals-1 Of 2 UQ7 W/O Y91)
Fig 3: Radio/Audio System Schematics (UQ7 W/O Y91) (Amplifier Power, Ground, Inputs & Controls - UQ7 W/O Y91-W/O UK6)