Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
HUD Switch Signal | 1 | 1 | B3567 01 | B3567 59 |
HUD Dimmer Switch Signal | 1 | 1 | 1 | -- |
HUD switch Low Reference | -- | 1 | 1 | -- |
1. HUD Malfunction | ||||
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 equipped with a page switch that scrolls through multiple messages present on the HUD. The HUD is also equipped with automatic dimming. Dimming is controlled by a HUD dimmer switch. All three switches control the HUD by grounding the HUD switch input signals. The dimmer switch uses a variable resistor to control the HUD intensity where the lower the resistance, the brighter the HUD display.
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Head Up Display (HUD) Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Ignition ON, verify that the HUD image is displayed on the windshield.
- Ignition ON, verify that when the HUD switches are pressed and released the HUD scan tool parameters toggle between Active and Inactive.
| ⇒ | If the HUD image is not displayed, refer to HUD Inoperative. |
| ⇒ | If the parameters do not toggle between Active and Inactive, refer to HUD Switch Malfunction. |
Circuit/System Testing
HUD Inoperative
- Ignition OFF, disconnect the harness connector at the HUD switch.
- Ignition OFF, test for less than 5 ohms between the low reference circuit terminal 3 and ground.
- Verify the scan tool Display Dimming parameter is greater than 98 percent.
- Install a 3A fused jumper wire between the signal circuit terminal 2 and the low reference circuit terminal 3. Verify the scan tool Display Dimming parameter is less than 2 percent.
- If all circuits test normal, test or replace the HUD switch.
| ⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the HUD. |
| ⇒ | If less than the specified range, test the signal circuit terminal 2 for a short to ground. If the circuit tests normal, replace the HUD. |
| ⇒ | If greater than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the HUD. |
HUD Switch Malfunction
- Ignition OFF, disconnect the harness connector at the HUD switch assembly.
- Ignition OFF, test for less than 5 ohms between the low reference terminal 3 and ground.
- Ignition ON, verify that all of the scan tool HUD Switch parameters are Inactive.
- Ignition ON, install a 3-amp fused jumper wire between the signal circuit terminal 6 and ground. Verify the scan tool HUD Switch parameters are Active.
- If all the circuits test normal, test or replace the HUD switch assembly.
| ⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. |
| ⇒ | If any is not Inactive, test the signal circuit terminal 6 for a short to ground. If the circuit tests normal, replace the HUD. |
| ⇒ | If any are not Active, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the HUD. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for HUD replacement, setup, and programming |
