Head Up Display Malfunction
Head Up Display Malfunction
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.
Diagnostic Fault Information
Circuit/System Description
The head-up display (HUD) is a secondary display system capable of reflecting important vehicle information onto the windshield. 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 serial data circuit. The HUD interfaces with the HUD switch via discreet circuits and the HUD switch inputs to the HUD is low.
Reference Information
Schematic Reference
Head Up Display Schematics (Head Up Display Schematics)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Head Up Display Description and Operation (Description and Operation)
Electrical Information Reference
* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)
Scan Tool Reference
Control Module References (Programming and Relearning) for scan tool information
Circuit/System Verification
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 when the HUD switches are pressed and released the HUD scan tool parameters toggle between Active and Inactive.
• If the parameters do not toggle between Active and Inactive, refer to HUD Switch Malfunction.
Circuit/System Testing
HUD Inoperative
1. Ignition OFF, disconnect the harness connector at the HUD switch.
2. Ignition OFF, test for less than 5 ohms between the low reference circuit terminal 5 and ground.
• If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the HUD.
3. Verify the scan tool Display Dimming parameter is greater than 98 percent.
• If less than the specified range, test the signal circuit terminal 4 for a short to ground. If the circuit tests normal, replace the HUD.
4. Install a 3A fused jumper wire between the HUD signal circuit terminal 4 and the low reference circuit terminal 5. Verify the scan tool Display Dimming parameter is less than 2 percent.
• If greater than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the HUD.
5. If all circuits test normal, test or replace the HUD switch.
HUD Switch Malfunction
1. Ignition OFF, disconnect the harness connector at the head-up display (HUD)/Dimmer switch.
2. Test for less than 1.0 ohm between the low reference circuit terminal 5 and ground.
• If greater than the specified range, test the low reference circuit for an open/high resistance.
3. Ignition ON, verify that all of the scan tool HUD switch parameters are Inactive.
• If not Inactive, test the signal circuit terminals listed below for a short to ground. If the circuit tests normal, replace the HUD.
* Image Down Switch Signal Terminal 6
* Image Up Switch Signal Terminal 7
4. Install a 3A fused jumper wire between the HUD switch signal circuit terminals listed below and the low reference circuit terminal 5. Verify the scan tool Adjust Display Down Switch or Adjust Display Up Switch parameter is Active.
* Image Down Switch Signal Terminal 6
* Image Up Switch Signal Terminal 7
• If not Active, test the switch signal circuit for an open/high resistance. If the circuit(s) test normal, replace the HUD.
5. Verify the scan tool Display Dimming parameter is greater than 98 percent.
• If less than the specified range, test the signal circuit terminal 4 for a short to ground. If the circuit tests normal, replace the HUD.
6. Install a 3A fused jumper wire between the signal circuit terminal 4 and the low reference circuit terminal 5. Verify the scan tool Display Dimming parameter is less than 2 percent.
• If greater than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the HUD.
7. If all circuits test normal, test or replace the HUD switch.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Control Module References (Programming and Relearning) for the HUD replacement, setup and programming
* Head Up Display Switch Replacement (Head Up Display Switch Replacement)