Is the concern still present?

Ignition OFF. Disconnect and inspect all the ACM connectors. 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 ACM connectors. Make sure they seat and latch correctly. Operate the system and determine if the concern is 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) (415-00A Information and Entertainment System - General Information - Vehicles With: AM/FM/CD/SYNC, Removal and Installation).
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.

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) (415-00A Information and Entertainment System - General Information - Vehicles With: AM/FM/CD/SYNC, Removal and Installation).

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.

The Left Parcel Shelf Speaker Is Inoperative (Coupe)

Refer to Wiring Diagrams Cell 132 for schematic and connector information.

Normal Operation and Fault Conditions

REFER to: Information and Entertainment System - System Operation and Component Description (415-00A Information and Entertainment System - General Information - Vehicles With: AM/FM/CD/SYNC, Description and Operation). See ACM.

DTC Fault Trigger Conditions

DTC Description Fault Trigger Conditions B1A04:01 Speaker #4: General Set by the ACM when a failure is detected on the left parcel shelf speaker Electrical Failure circuits. B1A04:11 Speaker #4: Circuit Set by the ACM when a short to ground is detected on the left parcel shelf Short To Ground speaker circuits. When DTC B1A04:11 is set, the speaker output is disabled. B1A04:12 Speaker #4: Circuit Set by the ACM when a short to voltage is detected on the left parcel shelf Short To Battery speaker circuits. When DTC B1A04:12 is set, the speaker output is disabled. B1A04:13 Speaker #4: Circuit Set by the ACM when an open is detected on the left parcel shelf speaker Open circuits.

Original table alignment retained · Scroll horizontally if needed

Possible Sources

Speaker Wiring, terminals, or connectors ACM

Source reference 4167

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.