Grand Prix V6-191 3.1L VIN M SFI (1998)
Heads Up Display Unit: Description and Operation
The Instrument Cluster Head-Up Display (HUD) system projects frequently used driver information near the front of the vehicle as viewed from the
driver's seat. During operation, information displayed by the the instrument cluster HUD system includes: a digital speedometer operating in either miles
per hour or kilometers per hour, turn indicators, hi beam indicator, low fuel indicator, CHECK GAGE indicator, and radio receiver information.
The instrument cluster HUD system consists of an instrument cluster HUD specific windshield, the the instrument cluster HUD, and the the instrument
cluster HUD dimmer switch. The instrument cluster HUD and the instrument cluster HUD dimmer switch are both connected to the instrument panel
wiring harness.
The instrument cluster HUD dimmer switch provides power to the instrument cluster HUD, varies the intensity of the display image, and controls the
motor driven mirror that varies the height of the display image. The instrument cluster HUD dimmer switch is back lit. The intensity of the back lighting
is controlled by the dimmer control on the headlight switch. The headlight switch along with the the instrument cluster HUD also control night brightness
of the display image. With the headlight switch in the PARK or HEAD positions, the the instrument cluster HUD will dim.
The instrument cluster HUD will perform a self test when first activated. If the instrument cluster HUD dimmer switch is on when the ignition switch is
turned to the RUN position, the the instrument cluster HUD will project the turn indicators, hi beam indicator, low fuel indicator, CHECK GAGE
indicator, km/h indicator, mph indicator, and all segments of the digital speedometer and radio display for approximately 3.5 seconds. After this time,
the the instrument cluster HUD will begin normal operation. A self-test, identical to the one previously described, will also occur when the the instrument
cluster HUD dimmer switch is moved out of the OFF position after the ignition switch is turned to the RUN position.
IMPORTANT: For optimal the instrument cluster HUD performance, an instrument cluster HUD specific windshield must be used whenever the
windshield is replaced.
