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. |
DTC Descriptor
DTC B3620: Head-Up Display (HUD) Image Up Switch Signal Circuit Short to GroundDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage |
|---|---|---|---|
HUD Image Up Switch Signal | B3620 | 1 | 1 |
HUD Image Down Switch Signal | B3621 | 1 | 1 |
HUD Battery + Circuit | 1 | 1 | -- |
HUD Ground Circuit | -- | 1 | -- |
Dimmer/HUD Switch Ground Circuit | -- | 1 | 1 |
1. Head-Up Display (HUD) Malfunction. | |||
Circuit/System Description
The head-up display (HUD) image down or image up switch are used to vertically adjust the HUD image on the windshield to accommodate various vehicle operator heights. The HUD monitors the image down or image up switch signal circuit in order to adjust image positions. When the HUD image down or image up switch is depressed and the ignition is in the RUN position, the switch signal to the HUD is low.
Conditions for Running the DTC
The ignition is in RUN.
Conditions for Setting the DTC
The HUD detects that the HUD image up switch signal circuit is low for greater than 60 seconds.
Action Taken When the DTC Sets
The HUD ignores the malfunctioning switch circuit.
Conditions for Clearing the DTC
| • | 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. |
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 when the HUD image up switch is pressed and released the HUD scan tool Adjust Display Up Switch parameter toggles between Active and Inactive.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the HUD switch.
- Test for less than 5.0 ohm between the low reference circuit terminal 1 and ground.
- Ignition ON, verify the scan tool Adjust Display Up Switch parameter is Inactive.
- Install a 3A fused jumper wire between the switch signal circuit terminal 2 and the low reference circuit terminal 1. Verify the scan tool Adjust Display Up Switch parameter is Active.
- 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 not Inactive, test the signal circuit terminal 2 for a short to ground. If the circuit tests normal, replace the HUD. |
| ⇒ | If 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.
