Radio/HVAC Controls

The radio controls are a separate component from the radio. The radio controls contain the radio control knobs and buttons for all audio functions.

The radio controls operate radio functions through serial data messages. The radio controls communicate to the info display module through LIN serial data. The info display module communicates to the radio through CGI serial data.

When equipped with the optional navigation radio, the radio controls communicate directly to the navigation radio.

Messages communicated between the radio, the radio controls, and the info display include the following:

• Button presses/knob rotations
• Info display module dimming
• Radio controls back-lighting
• Graphics and text information

The HVAC controls are a separate component from the radio controls. HVAC data for controls and status indicators is communicated between the HVAC controls and the HVAC control module with a separate LIN serial data circuit. HVAC status screen information from the HVAC control module is transmitted to the radio on the GMLAN serial data circuit. The radio then displays the desired screen information on the info display using the video data circuits.