Rear Seat Audio Control Module
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2003 GMC Yukon XL, 2003 GMC Yukon, 2003 Chevrolet Tahoe, 2003 Chevrolet Suburban, and 2003 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
The rear seat audio control module is a class 2 device that interfaces between the rear seat passengers and the auxiliary HVAC control module. The battery positive voltage circuit provides power that the control module uses for keep alive memory (KAM). Air temperature, blower motor and air delivery rocker type switches are located on the face of the module. Pressing a switch enables the module to send a class 2 serial data message to the auxiliary HVAC control module for the change request. The module does not store auxiliary HVAC DTCs.