Acadia FWD V6-3.6L (2007)
Heads Up Display Unit: Description and Operation
Head Up Display (HUD) Description and Operation
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:
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The speedometer reading (speed up to 120 mph)
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The turn signal indicators
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The high beam indicator
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The low fuel indicator
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The check gages indicator
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The radio frequency, including AM, FM, CD, and Tape
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Backup vehicle speed
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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:
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Brake failure
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Charging system/generator fault
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Coolant temp hot
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Low brake fluid level
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Low oil pressure
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Low tire pressure
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Parking brake
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Voltage
Radio
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The head-up display (HUD) displays the following radio information depending on the current radio settings:
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Frequency
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Band
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CD Track #
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Current Disk # (for multiple disk player)
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Cassette icon (when cassette is playing)
