Buick Regal: Radio Information Display Malfunction (IO5/IO6)

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.
• Refer to Diagnostic Procedure Instructions for an overview of each diagnostic category.

Circuit/System Description

The infotainment display and controls are a separate component from the radio, combined into an assembly. The assembly is supplied battery voltage and ground from the vehicle harness. The human machine interface control module communicates digital video data for on-screen display through a dedicated cable containing the LVDS data circuits.

Control information, touch communications and dimming level for the display are communicated via a LIN serial data circuit to the human machine interface control module.

Diagnostic Aids

Malfunctions may include a flickering or distorted image or a blank screen.

Reference Information

Schematic Reference

Radio/Navigation System Wiring Schematics (IOB) , Radio/Navigation System Wiring Schematics (IOR) or Radio/Navigation System Wiring Schematics (IO5/IO6) , or Radio/Navigation System Wiring Schematics (IOS/IOT).

Connector End View Reference

Component Connector End View Index

Description and Operation

Radio/Audio System Description and Operation (IO6) , Radio/Audio System Description and Operation (IOB) , or Radio/Audio System Description and Operation (IOS/IOT/IOU).

Electrical Information Reference

• Refer to Circuit Testing
• Refer to Connector Repairs
• Refer to Testing for Intermittent Conditions and Poor Connections
• Refer to Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing

1. Vehicle OFF/Ignition OFF.

2. Verify the LVDS interface cable is properly connected at the P17 Info Display Module X2 and the K74 Human Machine Interface Control Module X5 connections and there is no damage to the cable or connections.

3. Ignition ON/Vehicle in Service Mode, infotainment system ON.

4. Verify the P17 Info Display Module does not display an image.

• If the P17 Info Display Module displays an image.

All OK.

• Go to next step: If the P17 Info Display Module does not display an image.

5. Vehicle OFF/Ignition OFF.

6. Disconnect the LVDS interface cable from the P17 Info Display Module X2.

7. Connect the EL-50334-2 Type A female to Mini B male USB Cable to the P17 Info Display Module X2. Connect the EL-50334-14 Infotainment Test Cable to the adapter.

8. Disconnect the LVDS interface cable from the K74 Human Machine Interface Control Module X5. Connect the EL-50334 - 14 Infotainment Test cable to the K74 Human Machine Interface Module X5.

9. Ignition ON/Vehicle in Service Mode, infotainment system ON.

10. Verify the P17 Info Display Module displays an image.

• If the P17 Info Display Module does not display an image

1. Using the scan tool, access the HMI control functions and select Info Display Test.
2. Verify the P17 Info Display Module displays an image.
   • If the P17 Info Display Module displays an image, replace the K74 Human Machine Interface Control Module.
   • Go to next step: If the P17 Info Display Module does not display an image
3. Replace the P17 Info Display Module. Connect all harness connectors.
4. Verify the P17 Info Display Module displays an image.
   • If the P17 Info Display Module does not display an image, replace the K74 Human Machine Interface Control Module.
   • Go to next step: If the P17 Info Display Module displays an image
5. All OK

• Go to next step: If the P17 Info Display Module displays an image.

11. Replace the vehicle LVDS interface cable from the P17 Info Display Module X2 to the K74 Human Machine Interface Module X5.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

• Refer to Radio Control Assembly Replacement (IOB) or Radio Control Assembly Replacement (IO5, IO6)
• Refer to Control Module References for human machine interface control module replacement, programming, and setup.

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