Information Display and Controls
| Callout | Component Name |
|---|---|
| 1 | Radio/HVAC Controls |
| 2 | Info Display Module |
| 3 | Radio |
| 4 | HVAC Control Module |
| 5 | Data Link Connector |
| a | GMLAN |
| b | Local Interconnect Network |
| c | CAN Graphical Interface |
| d | Digital Video |
| e | Touch Screen Serial Data |
The info display module has continuous power and ground. When the radio is on, a discrete 12 V signal is supplied on the remote enable circuit to the color display module. This signal is used to control the power state of the module, which is active when the signal is high and inactive when the signal is low.
The info display module receives digital video data from the radio for on-screen display information through a dedicated video cable. 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/HVAC 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 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.