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Radio Information Display Malfunction - DTC U0257

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.

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

Connector End View Reference

Component Connector End Views

Description and Operation

Radio/Audio System Description and Operation

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 as current.
    2. ⇒If DTC B1265 is set as current, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
  2. Vehicle in Service Mode, radio ON, verify the info display module turns on and information is shown on the display.
    3. ⇒If the info display is inoperative, refer to Circuit/System Testing.

Circuit/System Testing
  1. Vehicle OFF, verify the video interface cable is properly connected at the display X2 and radio X5 connections and there is no damage to the cable or connections.
    2. ⇒Perform the appropriate repair or replacement to correct any issues found with the video interface cable or it's connections.
  2. Vehicle OFF, disconnect the X1 harness connector at the P17 info display module.
  3. Test for less than 10 Ω between the ground circuit terminal 2 and ground.
    4. ⇒If greater than the specified range, test the ground for an open/high resistance.
  4. Test for less than 20 Ω between the data shield circuit terminal 7 and ground.
    5. ⇒If greater than the specified range, test the data shield circuit for an open/high resistance. If the circuit tests normal, replace the A11 radio.
  5. Verify that a test lamp illuminates between the B+ circuit terminal 1 and ground.
    6. ⇒If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  6. Vehicle in Service Mode, verify that a test lamp illuminates between the entertainment remote enable circuit terminal 6 and ground.
    7. ⇒If the test lamp does not illuminate, test the remote enable circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the A11 radio.
  7. Test for 2-3 V between the touch screen data high circuit terminal 4 and ground.
    8. ⇒If less than the specified range, test the data circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the A11 radio.
    ⇒If greater than the specified range, test the data circuit for a short to voltage. If the circuit tests normal, replace the A11 radio.
  8. Test for 2-3 V between the touch screen data low circuit terminal 8 and ground.
    9. ⇒If less than the specified range, test the data circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the A11 radio.
    ⇒If greater than the specified range, test the data circuit for a short to voltage. If the circuit tests normal, replace the A11 radio.
  9. Vehicle OFF, reconnect the harness connector at the P17 info display module.
  10. Disconnect the X4 harness connector at the A11 radio.
  11. Vehicle in Service Mode, test for 3-5 V between the display reset signal circuit terminal 10 and ground.
    12. ⇒If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the P17 info display module.
    ⇒If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the P17 info display module.
  12. If all circuits test normal, replace the video interface cable. Reconnect all harness connectors.
  13. Vehicle in Service Mode, radio ON, verify the info display module turns on and information is shown on the display.
    14. ⇒ If the information display still malfunctions, replace the P17 information display module. Vehicle in Service Mode, radio ON, verify the info display module turns on and information is shown on the display. If the information display still malfunctions, replace the A11 radio.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

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


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