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HOMESERVICE MANUALSCHEVROLET2006SUBURBAN C2500, 6.0 UREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1228 (CELLULAR SYSTEM, ENTERTAINMENT SYSTEM, AND NAVIGATION SYSTEM)DESCRIPTION AND OPERATIONRADIO/AUDIO SYSTEM DESCRIPTION AND OPERATIONCIRCUIT OPERATIONCAN GRAPHICAL INTERFACE (CGI)
2006 Chevrolet Suburban C2500, 6.0 U

CAN Graphical Interface (CGI)

2006 Chevrolet Suburban C2500, 6.0 USECTION CAN Graphical Interface (CGI)
WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.

The CAN Graphical Interface (CGI) is a high-speed UART link used to transfer high - rate display graphics to the faceplate. Two-baud rates define CGI, a low-speed, and a high-speed. The low-speed rate is 28,000 bits/second. The high-speed rate is 625,000 bits/second. The UART communication format for both speeds is bi-directional.

CGI communications include the following:

  • The radio provides the dimming levels for the display and communicates this information to the faceplate via the CGI circuit.
  • Button presses and knob rotations are communicated from the faceplate to the radio via the CGI circuit.
  • HVAC control button presses from the faceplate are communicated over the CGI circuit to the radio. The radio places the information on the GMLAN circuit which is sent to the electronic climate control (ECC) module.
  • If equipped with the Heated Seats option, a warmer or cooler seat request is made and the message is communicated over the CGI circuit to the radio. The radio places the information on the GMLAN circuit which is sent to the memory seat module (MSM).
  • The radio commands the state of faceplate indicators and telltales over the CGI circuit.
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