Chevrolet Trax: Radio information display malfunction (color display)

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/System Description

The info display module has continuous power and ground. When the radio is on, a discrete 12 V signal is supplied on the radio controls wakeup circuit to the info display module. This signal is used to control the power state of the module, which is active when the signal is high and inactive when the signal is low.

The info display module receives digital video data from the radio for on-screen display information through the video signal circuits. Backlighting dimming level is controlled by the radio through a pulse width modulated circuit. The output is determined by dimming level information the radio receives via serial data.

Reference Information

Schematic Reference

Radio/Navigation System Schematics (Encore), Radio/Navigation System Schematics (Trax)

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Radio/Audio System Description and Operation (with Monochrome Display), Radio/Audio System Description and Operation (with Color Display)

Electrical Information Reference

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

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Verify DTC B1265 is not set.

• If DTC B1265 is set.

Refer to Diagnostic Trouble Code (DTC) List - Vehicle .

• If DTC B1265 is not set.

2. Ignition ON, radio ON.
3. Verify the P17 Info Display Module turns on and information is shown on the display.

• If the P17 Info Display Module does not turn on, or information is not shown in the display.

Refer to Circuit/System Testing

• If the P17 Info Display Module turns on and information is shown on the display.

4. All OK.

Circuit/System Testing

1. Ignition OFF.
2. Verify the video interface cable is properly connected at the P17 Info Display Module X2 and A11 Radio X5 connections and there is no damage to the cable or connections.

If connection problems or cable damage is noted.

Perform the appropriate repair or replacement to correct any issues.

If no issues are found with the video interface cable.

3. Disconnect the X1 harness connector at the P17 Info Display Module.
4. Test for less than 10 ohms between the ground circuit terminal 2 and ground.

If 10 ohms or greater

1. Ignition OFF.
2. Test for less than 2 ohms in the ground circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, repair the open/high resistance in the ground connection.
• If less than 10 ohms

5. Verify that a test lamp illuminates between the B+ circuit terminal 1 and ground.

If the test lamp does not illuminate and the circuit fuse is good

1. Ignition OFF.
2. Test for less than 2 ohms in the B+ circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, refer to Power Mode Mismatch

If the test lamp does not illuminate and the circuit fuse is open

1. Ignition OFF.
2. Test for infinite resistance between the B+ circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the P17 Info Display Module.
• If the test lamp illuminates.

6. Ignition ON, radio ON.
7. Verify that a test lamp illuminates between the control circuit terminal 6 and ground.

• If the test lamp does not illuminate.

1. Ignition OFF, disconnect the X1 harness connector at the A11 Radio.
2. Test for infinite resistance between the control circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance

3. Test for less than 2 ohms in the control circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the A11 Radio.
• If the test lamp illuminates.

8. Ignition ON, lights ON, set the I/P dimming switch to full bright.
9. Test for 5-7 V between the dimming control circuit terminal 3 and ground.

If less than 5 V

1. Ignition OFF, disconnect the X4 harness connector at the A11 Radio.
2. Test for infinite resistance between the control circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance

3. Test for less than 2 ohms in the control circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the A11 Radio.

If greater than 7 V

1. Ignition OFF, disconnect the X4 harness connector at the A11 Radio. Ignition ON.
2. Test for less than 1 V between the control circuit and ground.

• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the A11 Radio.
• If between 5-7 V

10. Verify the voltage increases steadily to 6-7 V at full dim while using the I/P dimming switch to decrease the dimming level.

If less than 6 V

1. Ignition OFF, disconnect the X4 harness connector at the A11 Radio.
2. Test for infinite resistance between the control circuit and ground

• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance

3. Test for less than 2 ohms in the control circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the A11 Radio.

If greater than 7 V

1. Ignition OFF, disconnect the X4 harness connector at the A11 Radio. Ignition ON.
2. Test for less than 1 V between the control circuit and ground.

• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the A11 Radio.

If between 6-7 V

11. Replace the video interface cable.
12. Connect all harness connectors.
13. Ignition ON, radio ON.
14. Verify the P17 Info Display Module turns on and information is shown on the display.

If the P17 Info Display Module does not turn on, or information is not shown in the display.

1. Replace the P17 Information Display Module.
2. Ignition ON, radio ON.
3. Verify the P17 Info Display Module turns on and information is shown on the display.

• If the information display malfunctions, replace the A11 Radio.
• If the info display module turns on and information is shown on the display.

4. All OK.

If the info display module turns on and information is shown on the display.

15. All OK

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

• Driver Information Display Replacement (UAG) , Driver Information Display Replacement (UDN)
• Control Module References for radio replacement, programming, and setup.

READ NEXT: