Source Switching
WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
Press the PROG or SRCE button in order to switch between playing a cassette or a CD and listening to the radio. There must be a cassette tape and/or compact disc in the player.