The head-up display (HUD) is a secondary display system capable of reflecting important vehicle information onto the windshield. The vehicle information is displayed using virtual imaging and is reflected off the windshield in front of the driver. Battery positive voltage is the power source to the HUD system. The HUD system can only be enabled when the ignition is active and in RUN position. The HUD receives vehicle information to be displayed via the serial data circuit. The HUD also interfaces with the HUD switches via discreet circuits.

Schematic Reference

Head Up Display Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Head Up Display (HUD) Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON, verify that the HUD image is displayed on the windshield.

⇒	If the HUD image is not displayed, refer to HUD Inoperative.

2. Ignition ON, verify that the HUD switches operate when pressed and released.

⇒	If any of the switches do not operate, refer to HUD Switch Malfunction.

HUD Inoperative

1. Ignition OFF, disconnect the harness connector at the HUD.
2. Ignition OFF, test for less than 5 ohms between the HUD ground circuit terminal 4 and ground.

⇒	If greater than the specified range, test the ground circuit for an open/high resistance. If the circuit tests normal, replace the HUD.

3. Ignition ON, verify a test lamp illuminates when connected between the B+ circuit terminal 6 and ground. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the HUD.
4. Ignition OFF, install a 3A fused jumper wire between the ground circuit terminal 8 and ground.
5. Ignition ON, verify a test lamp illuminates when connected between the HUD dimming switch signal circuit terminal 5 and B+ while pressing the HUD dimming switch.

⇒	If the test lamp does not illuminate, test the signal circuit and the ground circuit for a short to voltage or an open/high resistance. If the circuits tests normal, replace the HUD switch.

6. If all circuits test normal, test or replace the HUD.

HUD Switch Malfunction

1. Ignition OFF, disconnect the harness connector at the HUD.
2. Install a 3A fused jumper wire between the ground circuit terminal 8 and ground.
3. Ignition ON, verify that a test lamp illuminates when connected between B+ and the HUD switch signal circuit terminals listed below while pressing the corresponding switch.

•	Image up control switch signal circuit terminal 2

•	Image down control switch signal circuit terminal 3

•	Switch signal circuit terminal 7

⇒	If the test lamp does not illuminate with any of the switches, test the appropriate signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the HUD switch.

⇒	If the test lamp does not illuminate, test the ground circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the HUD switch.

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

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.