Pinpoint Test Ac : DTC U0257:00
- AC1 VERIFY THE CUSTOMER CONCERN
- Ignition ON.
- Verify there is an observable symptom present.
Is an observable symptom present?
Yes GO to AC2. No The system is operating normally at this time. The DTC may have been set due to high network traffic or an intermittent fault condition. - AC2 CHECK FOR LOST COMMUNICATION DTCs
- Ignition ON.
- Using a diagnostic scan tool, clear all CMDTCs.
- Ignition OFF.
- Ignition ON.
- Wait at least 10 seconds.
- Using a diagnostic scan tool, retrieve all CMDTCs.
Is DTC U0257:00 set in any audio system module?
Yes GO to AC3. No The system is operating normally at this time. The DTC may have been set due to high network traffic or an intermittent fault condition. - AC3 CHECK THE AUDIO SYSTEM MODULES FOR BATTERY VOLTAGE OUT-OF-RANGE DTCs
- Using a diagnostic scan tool, perform the self-test for the following modules:
- ACM
- FCDIM
- APIM (with SYNC ®)
Are any low or high voltage DTCs recorded in any module?
Yes For DTC U3003:16, GO to Pinpoint Test AD . For DTC U3003:17, GO to Pinpoint Test AE . No GO to AC4. - Using a diagnostic scan tool, perform the self-test for the following modules:
- AC4 CHECK FOR DTC U0257:00 SET IN MULTIPLE MODULES
- Review the recorded results from the self-test.
Is DTC U0257:00 set in more than one audio system module?
Yes GO to AC5. No Refer to Information and Entertainment System - Premium , Symptom Chart: General Audio System to diagnose the observed symptom. - AC5 CHECK FOR CORRECT FCDIM OPERATION
- Ignition OFF.
- Disconnect and inspect the FCDIM 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 FCDIM 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 FCDIM. Refer to Front Controls/Display Interface Module (FCDIM) . 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.