Is the concern still present?
Yes | CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new ACM. REFER to: Audio Front Control Module (ACM) (415-00B Information and Entertainment System - General Information - Vehicles With: Touchscreen Display, Removal and Installation). |
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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. |
D32 CHECK FOR CORRECT APIM (SYNC MODULE) 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 Technical Service Bulletins (TSBs). If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no Technical Service Bulletins (TSBs) address this concern, PERFORM the APIM Hardware Test. Click here to access Guided Routine (APIM). |
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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. |
A Loud Popping Sound Is Heard When Cycling The Ignition
Refer to Wiring Diagrams Cell 131 for schematic and connector information.
Refer to Wiring Diagrams Cell 20 for schematic and connector information.
Normal Operation and Fault Conditions
The ACM receives voltage on a start signal circuit when the ignition is in the START position, and mutes the audio signal output. This prevents voltage spikes from producing popping noises through the speakers. An open on this circuit between splice CS101 and the ACM could cause voltage spikes to produce popping noises through the speakers.
Possible Sources
Wiring, terminals, or connectors ACM
PINPOINT TEST E : A LOUD POPPING SOUND IS HEARD WHEN CYCLING THE IGNITION
E1 CHECK THE START SENSE CIRCUIT FOR AN OPEN
2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.