Monitor Check: Notes

Overview of display unit

• The display unit communicates with the navigation unit over its own GA-Net bus. Information is sent to the navigation unit whenever the user activates the touch screen, or hard buttons. Information sent by the navigation unit to the display unit includes commands to control the LCD back light.
• The security system protects the navigation display by daisy-chaining the security signal through it, and then passing the signal to the audio unit.
• The illumination input from the gauge brightness control provides back lighting for the hard buttons surrounding the screen.
• The display unit also communicates with the climate control module to set the A/C mode, and fan speed, and to receive the outside temperature that is displayed on the A/C-INFO screen.

These screens allow you to troubleshoot the display unit. Touch the menu item you want to troubleshoot, and follow the diagnostic instructions.