• | 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. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage |
---|---|---|---|
HUD Battery+ | 1 | 1 | -- |
HUD Ground | -- | 1 | 1 |
HUD Page Switch Signal | B3619 | 1 | 1 |
HUD Up Switch Signal | B3620 | 1 | 1 |
HUD Down Switch Signal | B3621 | 1 | 1 |
HUD Dimming Up switch Signal | B3634 | 1 | 1 |
HUD Dimming Down Switch Signal | B3659 | 1 | 1 |
HUD Mode Switch Signal | B3744 | 1 | 1 |
HUD Switch Ground | -- | 1 | 1 |
1. Head- up Display (HUD) Malfunction. |
The head-up display (HUD) dim down switch is a momentary contact switch that adjusts the HUD display brightness. The HUD dim down switch controls the intensity of the brightness. The HUD senses when the dim down switch is active and adjusts the display brightness until the desired intensity is attained. When the HUD illumination reaches the minimum intensity, the HUD will turn off the display by the next dim down switch input. The HUD does not have a separate OFF switch. The HUD is turned OFF using the dim down switch. When the HUD dim down switch is pressed and the ignition is in the RUN position, the dim down switch signal to the HUD is low. A press and hold of the dim down switch greater than 1 second initiates a smooth decrease in the HUD intensity until the switch is released or the HUD is turned OFF.
The ignition is in RUN.
The HUD detects that the HUD dim down switch signal circuit is low for greater than 60 seconds.
The HUD ignores the malfunctioning switch circuit.
• | The DTC becomes history when the conditions for setting the DTC are no longer present. |
• | The history DTC clears after 40 malfunction-free warm-up cycles. |
Head Up Display (HUD) Description and Operation
Control Module References for scan tool information.
Ignition ON, verify that when the HUD dimming down switch is pressed, the HUD image intensity on the windshield and the scan tool Dimming Level parameter percentage decreases simultaneously.
⇒ | If greater than the specified range, test the ground 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 D for a short to ground. If the circuit tests normal, replace the HUD. |
⇒ | If greater than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the HUD. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.