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Home >> Audi >> 2016 >> S5 Prestige, 2D Convertible >> Repair and Diagnosis >> External Pages >> Different car >> Section 877 (Information And Entertainment Systems - THX Audio System) >> Diagnosis And Testing >> Information and Entertainment System >> Pinpoint Tests >> Pinpoint Test AP : DTC U0253:00 >> Pinpoint Test AP : DTC U0253:00

Pinpoint Test AP : DTC U0253:00

WARNING: This page is about a different car, the 2017 Lincoln Navigator and 2017 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.

  1. AP1 VERIFY THE CUSTOMER'S CONCERN

    • Ignition ON.
    • Verify if there is an observable symptom present.

    Is an observable symptom present? 

    Yes  GO to  AP2.
    No  The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

  2. AP2 CHECK THE COMMUNICATION NETWORK

    • Using a diagnostic scan tool, perform a network test.

    Does the APIM pass the network test? 

    Yes  GO to  AP3.
    No  REFER to Module Communications Network .

  3. AP3 RETRIEVE THE APIM DTCs

    • Using a diagnostic scan tool, perform the APIM self-test.

    Are any non-network DTCs recorded in the APIM ? 

    Yes  GO to  AP4.
    No  REFER to the Accessory Protocol Interface Module (APIM) DTC Chart .

  4. AP4 RECHECK FOR DTC U0253:00

    • Using a diagnostic scan tool, clear all CMDTCs.
    • Ignition OFF.
    • Ignition ON.
    • Wait at least 10 seconds.
    • Using a diagnostic scan tool, retrieve the audio DSP module and ACM CMDTCs.

    Is DTC U0253:00 still set in the audio DSP module or ACM ? 

    Yes  GO to  AP5.
    No  The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

  5. AP5 RETRIEVE THE RECORDED DTCs FROM THE AUDIO DSP MODULE AND ACM SELF-TEST

    • Using a diagnostic scan tool, perform the self-test for the following modules:
      • audio DSP module
      • ACM

    Are any non-network DTCs recorded? 

    Yes  REFER to the DTC Charts .
    No  GO to  AP6.

  6. AP6 CHECK FOR DTC U0253 SET IN MULTIPLE MODULES

    • Review the CMDTCs from all modules.

    Is DTC U0253:00 or U0253:87 set in more than one module? 

    Yes  GO to  AP7.
    No  If there is an observable symptom, REFER to the Symptom Charts  to diagnose the observed symptom. If there is no observable symptom, the system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

  7. AP7 CHECK FOR CORRECT APIM OPERATION

    • Ignition OFF.
    • Disconnect and inspect the APIM connector.
    • Repair:
      • Corrosion (clean module pins or install new connectors or terminals)
      • Damaged or bent pins (install new terminals or pins)
      • Pushed-out pins (install new pins as necessary)
    • Reconnect the APIM connector. Make sure it seats and latches correctly.
    • Operate the system and determine if the concern is still present.

    Is the concern still present? 

    Yes  CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSBs address this concern, INSTALL a new APIM. REFER to Accessory Protocol Interface Module (APIM) .
    No  The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.
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