A Low Frequency Noise Is Heard From The Audio System (2.3L And 5.2L)

Reconnect the ACM connectors. Make sure they seat and latch 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, 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.

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 ANC, ANC Microphones, and DACMC.

DTC Fault Trigger Conditions

Description	Fault Trigger Conditions
U3000:92 Control Module: Performance or Incorrect Operation	Set by the DACMC when a fault is detected with the ANC system when running the Active Diagnostics Test.
U3000:94 Control Module: Unexpected Operation	Set by the DACMC when a fault is detected with the ANC system.

Description

Fault Trigger Conditions

U3000:92 Control Module: Performance or

Incorrect Operation

Set by the DACMC when a fault is detected with the ANC system when running the Active Diagnostics Test.

U3000:94 Control Module: Unexpected

Operation

Set by the DACMC when a fault is detected with the ANC system.

DTC

Possible Source

Improper ANC microphone installation or damage Wiring, terminals, or connectors DACMC

Visual Inspection and Diagnostic Pre-checks

The ANC system may not be compatible with speakers, other audio system components, and audio system architectures not approved by Ford. Ensure that no modifications have been made to the audio system. Inspect the LHF, RHF, RHR, and LHR door midwoofer speaker locations for items that may be blocking the speaker sound output.

PINPOINT TEST E : A LOW FREQUENCY NOISE IS HEARD FROM THE AUDIO SYSTEM (2.3L AND

5.2L)

E1 CHECK FOR ANC (ACTIVE NOISE CONTROL) MICROPHONE DIAGNOSTIC TROUBLE CODES (DTCS) PRESENT IN THE DACMC (DIGITAL AUDIO CONTROL MODULE C) OR SPEAKER DIAGNOSTIC TROUBLE CODES (DTCS) PRESENT IN THE ACM (AUDIO FRONT CONTROL MODULE)

Source reference 4141

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.