The head-up display (HUD) is a secondary display system that optically projects
critical vehicle information onto the windshield. The HUD system has an electric tilt
adjust that is controlled by the HUD up/down switch. Moving this switch directs the
motor to move the HUD image up or down on the windshield. The HUD is also equipped
with automatic dimming which gives the HUD the ability to sense outside light conditions,
via a photo-cell and automatically adjusts the brightness levels. You may manually
adjust the HUD image brightness by moving the HUD dim switch.
The HUD displays the following images:
| • | The speedometer reading (speed up to 120 mph) |
| • | The turn signal indicators |
| • | The high beam indicator |
| • | The check gages indicator |
| • | The radio frequency, including AM, FM, CD, and Tape |
| • | Values in English or metric units |
Speedometer
The speedometer is shown on the head-up display (HUD) as a 3-digit display.
The HUD speedometer is capable of displaying up to 120 mph. The HUD receives
a class 2 message from the engine control module (ECM) or the powertrain control
module (PCM) indicating vehicle speed. If the class 2 message from the ECM/PCM
is invalid the HUD will use a class 2 message from the electronic brake control
module (EBCM) instead.
LH Turn Signal and RH Turn Signal Indicator Inputs
The left and right turn indicators are driven by hardware inputs from the exterior
lighting system. The signal is active when the circuit is high (12 volts) and
inactive when circuit is open. During hazard mode, both the right and left turn signal
circuits are active high, causing both the right and left turn signal indicators to
illuminate at the same time.
High Beam Indicator Input
The head-up display (HUD) receives a class 2 message from the
body control module (BCM) that the high beams have been requested.
Low Fuel
The head-up display (HUD) receives a class 2 message from the
(IPC) indicating low fuel.
CHECK GAGES Inputs
The instrument panel cluster (IPC) monitors different inputs and vehicle messages
and sends the information to the head-up display (HUD), via a class 2
message. The HUD illuminates the CHECK GAGES indicator when it receives certain information
from the IPC.
The HUD will illuminate the Check Gages indicator for the following messages:
| • | Charging system/generator fault |
Radio
| • | The head-up display (HUD) displays the following radio information
depending on the current radio settings: |
| - | Current Disk # (for multiple disk player) |
| - | Cassette icon (when cassette is playing) |
| - | MP3 (folder name and track #) |
| - | Rear Seat Entertainment (RSE) (ON/OFF) |
| • | When the radio station, CD, or cassette are changed, the HUD displays
the new information for 5 seconds. |
| • | The HUD receives a class 2 message indicating a change in the setting
from the radio. |
| • | The HUD image blanks when the radio is seeking or scanning. |
Navigation
The navigation system displays the following information:
| • | The direction/maneuver arrow and destinations symbols |
| • | Arbitrary text for directions |
| • | The distance to next maneuver |
| • | The distance count down bar |
Backup Vehicle Speed
The head-up display (HUD) receives a class 2 message from the
body control module (BCM) indicating backup vehicle speed.
HUD English/Metric Input
The head-up display (HUD) illuminates the speedometer in either english
(mph) or metric (km/h) units depending upon the class 2 message received from
the instrument panel cluster (IPC).
