Information Display and Controls

The radio/HVAC control assembly is a separate component from the radio. The radio/HVAC control assembly contain the radio control knobs and buttons, HVAC control knobs and buttons, and an integrated display. The assembly is supplied battery voltage and ground. The radio uses a wake up circuit to control the power state of the asembly.

The info display receives digital video data from the radio for on-screen display information through the video signal circuits. The radio communicates with the info display module over the touch screen serial data circuits for touch screen inputs and backlighting dimming level.

The radio controls communicate radio control inputs directly to the radio through the CAN Graphical Interface (CGI) data circuits. After receiving the message the radio will perform the requested function. Messages communicated between the radio and the radio controls include the following:

• Button presses/knob rotations
• Commands for the state of indicators
• Radio control back-lighting

The HVAC controls are a separate component within the radio/HVAC control assembly. The HVAC control receives it's own battery voltage and ground circuits. 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.