Possible Sources

DTC Description Fault Trigger Conditions Electrical Failure speaker circuits. B1A03:11 Speaker #3: Circuit Set by the ACM when a short to ground is detected on the RHR quarter Short To Ground panel speaker circuits. When DTC B1A03:11 is set, the speaker output is disabled. B1A03:12 Speaker #3: Circuit Set by the ACM when a short to voltage is detected on the RHR quarter Short To Battery panel speaker circuits. When DTC B1A03:12 is set, the speaker output is disabled. B1A03:13 Speaker #3: Circuit Set by the ACM when an open is detected on the RHR quarter panel Open speaker circuits.

Original table alignment retained · Scroll horizontally if needed

Speaker Wiring, terminals, or connectors ACM

PINPOINT TEST L : THE RHR (RIGHT-HAND REAR) QUARTER PANEL SPEAKER IS INOPERATIVE

(CONVERTIBLE)

L1 CHECK THE AUDIO SIGNAL TO THE RHR (RIGHT-HAND REAR) QUARTER PANEL SPEAKER

Ignition OFF. Disconnect: RHR Quarter Panel Speaker C396. Operate the audio system in AM/ FM mode. Measure:

Click to display connectors

Positive Lead	Measurement / Action	Negative Lead
C396-1		C396-4

Possible Sources — original illustration 1, reference 4162Original colors & callouts · Select to enlarge

Is a fluctuating AC voltage present?

Yes	INSTALL a new RHR quarter panel speaker. REFER to: Rear Quarter Panel Speaker (415-00A Information and Entertainment System - General Information - Vehicles With: AM/FM/CD/SYNC, Removal and Installation).
No	GO to L2

L2 CHECK THE AUDIO CIRCUITS TO THE RHR (RIGHT-HAND REAR) QUARTER PANEL SPEAKER FOR A SHORT TO VOLTAGE

Ignition OFF. Disconnect: ACM C240A. Ignition ON. Measure:

Click to display connectors

Positive Lead	Measurement / Action	Negative Lead
C396-1		Ground
C396-4		Ground

Source reference 4162

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.