The head up display (HUD) is a secondary display system that reflects vehicle information onto the windshield. The HUD system consists of the following:
| • | The vehicle speed display |
| • | The adaptive cruise control display |
| • | Ambient air temperature |
Indicator Displays
The HUD displays the following and other arbitrary information generated from vehicle systems:
| • | The CHECK GAGES indicator |
| • | The high beam indicator |
| • | The km/h (MPH) indicator |
| • | The turn signal indicators |
| • | Tap Up/Tap Down Gear Selected and Upshift indicator |
Refer to
Indicator/Warning Message Description and Operation
.
Vehicle Speed Display
The HUD displays the vehicle speed based on information from the vehicle speed sensor. The ECM converts the data from the vehicle speed sensor to a 4,000 pulses/mile signal. The HUD uses the vehicle speed signal circuit (4,000 pulses/mile)
from the ECM in order to calculate the vehicle speed. The HUD displays either miles or kilometers as requested from the DIC. The associated indicator (km/h or MPH) illuminates in the IPC.
Ambient Air Temperature
The HUD displays the ambient air temperature based on serial data messages from the HVAC module. The ambient air temperature is displayed in Celsius or Fahrenheit corresponding to the DIC English or Metric setting.
Adaptive Cruise Control
The HUD displays the adaptive cruise control information to the driver. Refer to
Cruise Control Description and Operation
and
Indicator/Warning Message Description and Operation
for all the adaptive cruise indicators displayed in the HUD
Radio Display
The HUD displays the following radio information:
| • | The radio frequency and the band |
| • | The CD disc (for multiple changer) and the CD track |
The HUD receives serial data messages from the radio indicating the display mode, the frequency, the band, and the CD track.
Control Switches
The HUD switch consists of the following controls:
| • | The image adjustment switch |
| • | The display dimming switch |
The image adjustment switch controls the electric tilt adjust within the HUD. The image adjustment switch is hard wired to the motor within the HUD in order to move the HUD image vertically on the windshield. When the switch is in the up position, the
HUD image up control circuit provides voltage to the motor and the HUD image down control circuit provides the ground. When the switch is in the down position, the HUD image down control circuit provides voltage to the motor and the HUD image up control circuit
provides the ground.
The HUD brightness is manually adjusted by turning the display dimming switch. Turn the switch all the way to the left in order to turn OFF the HUD display. Turn the switch all the way to the right for maximum display brightness. The HUD receives a serial
data message from the BCM indicating the brightness level. When it is determined that it is daytime, the HUD uses both the integrated HUD photocell and the display dimming switch in order to control the dimming. If it is determined that it is nighttime, the
HUD uses the display dimming switch only in order to control the dimming.
