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Home >> Audi >> 2009 >> A4 Base, 2D Convertible >> Repair and Diagnosis >> External Pages >> Different car >> Section 1213 (Module Communications Network (2 Of 2)) >> Diagnosis And Testing >> Communications Network >> Pinpoint Tests >> Pinpoint Test Ah : The Head Up Display (HUD) Module Does Not Respond To The Diagnostic Scan Tool >> Notes

Pinpoint Test Ah : The Head Up Display (HUD) Module Does Not Respond To The Diagnostic Scan Tool: Notes

WARNING: This page is about a different car, the 2018 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.

Refer to Wiring Diagram Module Communications Network for schematic and connector information.

Refer to Wiring Diagram Vehicle Emergency Messaging System for schematic and connector information.

Normal Operation and Fault Conditions 

The HUD module communicates on the HS-CAN3, and communicates with the diagnostic scan tool through the HS-CAN2. Diagnostic messages are sent/received through the HS-CAN2 circuits at the DLC, and translated through the GWM to the MS-CAN.

Possible Sources 

Visual Inspection and Diagnostic Pre-checks 

Verify BCM fuse 9 (10A) is OK.

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