Head Up Display (HUD) Intensity Does Not Vary

Head Up Display (HUD) Intensity Does Not Vary

Diagnostic Fault Information

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview

Circuit/System Description

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. 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.

Circuit/System Testing

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.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests

* Head Up Display Switch Replacement (Rendezvous)
* Programming and Relearning for the HUD setup, and programming. Programming and Relearning