The head-up display (HUD) is a display system that optically projects vehicle information onto the windshield. The HUD has an electric tilt adjust that is controlled by the up and down switches. Operating these switches directs the motor to move the HUD image up or down on the windshield. There is also a page switch that can scroll through multiple messages present on the HUD. The HUD is also equipped with automatic dimming. Dimming is also controlled by a HUD dimmer switch. All three switches control the HUD by grounding the HUD switch input signals to ground. The dimmer switch uses a variable resistor to control HUD intensity where the lower the resistance, the brighter the HUD display.

Schematic Reference

Head Up Display Schematics

Connector End View Reference

Displays and Gages Connector End Views

Electrical Information Reference

Scan Tool Reference

Scan Tool Data List

1. Ignition OFF, disconnect the harness connector at the HUD module.
2. Connect a test lamp between the battery positive voltage circuit and the dimmer switch display signal circuit.
3. Ignition ON, verify that a test lamp illuminates and changes intensity when the dimmer switch is adjusted from low to high intensity.

⇒	If the test lamp does not vary in intensity, test the dimmer switch display signal circuit for an open/high resistance. If the circuit tests normal, replace the HUD switch.

4. If all circuits test normal, test or replace the HUD module.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.