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U0257




Radio Information Display Malfunction - DTC U0257

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Diagnostic Fault Information






Circuit/System Description

The radio info display module is supplied battery voltage and ground. The radio controls the power state of the display through the remote enable circuit, which is also used to control the power state of other infotainment devices. Display backlighting dimming level, and screen touch signal are communicated over the touch data circuits. The radio sends graphical image data to the display via a dedicated video interface cable.

Reference Information

Schematic Reference

Radio/Navigation System Schematics Radio/Navigation System Schematics

Connector End View Reference

Component Connector End Views Hybrid/EV Battery Pack X1

Description and Operation

Radio/Audio System Description and Operation Radio/Audio System

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Programming and Relearning 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 Diagnostic Trouble Code (DTC) List - Vehicle.

• If DTC B1265 is not set.

2. Vehicle in Service Mode, 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. Vehicle 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. Vehicle 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. Test for less than 20 ohms between the data shield circuit terminal 7 and ground.

• If 20 ohms or greater

1. Vehicle OFF, disconnect the X1 connector at the A11 radio.

2. Test for less than 2 ohms in the data shield 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 less than 20 ohms

6. 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. Vehicle 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 Power Mode Mismatch.

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

1. Vehicle 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.

7. Vehicle in Service Mode, radio ON.

8. Verify that a test lamp illuminates between the control circuit terminal 6 and ground.

• If the test lamp does not illuminate.

1. Vehicle 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.

9. Test for 2-3 V between the data circuit terminals listed below and ground.

* terminal 4

* terminal 8

• If less than 2 V

1. Vehicle OFF, disconnect the X1 harness connector at the A11 radio.

2. Test for infinite resistance between the data 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 data 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 3 V

1. Vehicle OFF, disconnect the X1 harness connector at the A11 radio. Vehicle in Service Mode.

2. Test for less than 1 V between the signal 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 2-3 V

10. Vehicle in Service Mode.

11. Test for less than 1 V between the control circuit terminal 5 and ground.

• If greater than 1 V

1. Vehicle OFF, disconnect the X4 harness connector at the A11 radio. Vehicle in Service Mode.

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 less than 1 V

12. Vehicle OFF, disconnect the X4 harness connector at the A11 radio.

13. Test for infinite resistance between the P17 info display module control circuit terminal 5 X1 and ground.

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

• If infinite resistance

14. Test for less than 2 ohms between the P17 info display module control circuit terminal 5 X1 and the A11 radio control circuit terminal 10 X4.

• If 2 ohms or greater
Repair the open/high resistance in the circuit.

• If less than 2 ohms.

15. Replace the video interface cable.

16. Connect all harness connectors.

17. Vehicle in Service Mode, radio ON.

18. 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. Vehicle in Service Mode, 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.

19. All OK

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

* Driver Information Display Replacement Driver Information Display Replacement

* Control Module References Programming and Relearning for radio replacement, programming, and setup.

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