Heads Up Display Unit: Description and Operation

HEAD UP DISPLAY (HUD) DESCRIPTION AND OPERATION

The reconfigurable head-up display (HUD) is a secondary display system that optically projects critical vehicle information off of the windshield. The head-up display is controlled by a combination switch located in the vehicle center console:
1. Page switch: The HUD displays four pages including format 1, format 2, format 3 (navigation mode), and format 4 (stealth mode).
2. Up/Down Switch: There is an electric tilt adjust indicated by up and down arrows within the center of the HUD switch. Moving this switch directs the motor to move the HUD image up or down on the windshield.
3. Power/Dimmer Switch: When the switch is in the "O" position, it is indicating that the HUD is in the OFF position. Once it is turned into the next position the HUD is powered on and now assumes the dim control of the display.

During the start up of the vehicle, all segments of the head-up display illuminate for 3 seconds. The HUD display will than display the last known page (format) before being powered down. The pages include the following:

Page 1
- Speed
- Turn Signals
- High Beam
- Park
- Tap Up/ Tap Down/ Upshift
- Outside air temperature
- Compass
- Values in english or metric units (as controlled by the DIC)
- Warning messages (temporary)
- Radio (temporary)
- CD player (temporary)
- Remote multiple CD player (temporary)
- Cassette (temporary)
- RNDL (temporary)

Page 2
- Speed,
- Turn Signals
- High Beam
- Park
- Tap Up/ Tap Down/ Upshift
- Values in english or metric units (as controlled by the DIC)
- Warning messages (temporary)
- Radio (temporary)
- CD player (temporary)
- Remote multiple CD player (temporary)
- Cassette (temporary)
- RNDL (temporary)

Page 3
- Speed
- Turn Signals
- High Beam
- Values in english or metric units (as controlled by the DIC)
- Warning messages (temporary)
- Radio (temporary)
- CD player (temporary)
- Remote multiple CD player (temporary)
- Cassette (temporary)

Page 4 (Stealth Mode)
- Available only at night when the Instrument Panel illumination is enabled
- Stealth mode displays the same content as Page 1

Telltales
The following is a list of telltales displayed in the HUD and the source from which it receives its Class 2 message
- Compass Heading (DIC)
- English/ Metric Mode (DIC)
- Gear Range Selection (DIC)
- High Beam (BCM)
- Outside Air Temperature (DIC)
- Radio/ CD/ Cassette Display (Radio)
- Speedometer (PCM)
- Tap Up/ Tap Down Transmission (DIC)
- Turn Signals/ Hazard lamps (BCM)

Warning Messages
The HUD will temporarily display certain warning messages as it receives a Class 2 message from the responsible source (module). The following are messages displayed by the HUD:
- Check Trip Computer (DIC)
- Cruise Speed Set XXX (PCM)
- Ice Warning (DIC)
- Stability Control Active (BCM)
- Traction Control Active (ABS)
- Traction Control Off (ABS)
- Turn by Turn Navigation (OnStar)
- Upshift (PCM)