Is the resistance less than 1 ohm?
Yes | INSPECT and REPAIR any corrosion on the RHR fender-mounted AM/ FM mast antenna base and/or vehicle mounting surface. REINSTALL the antenna and ensure the proper torque value is achieved. REFER to: Audio Unit Antenna (415-00A Information and Entertainment System - General Information - Vehicles With: AM/FM/CD/SYNC, Removal and Installation). |
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No | INSTALL a new RHR fender-mounted AM/ FM mast antenna. REFER to: Audio Unit Antenna (415-00A Information and Entertainment System - General Information - Vehicles With: AM/FM/CD/SYNC, Removal and Installation). |
B20 CHECK FOR CORRECT ACM (AUDIO FRONT CONTROL MODULE) OPERATION
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.
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). |
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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. |
The Speed Compensated Volume Does Not Operate Correctly
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 MyKey® Audio Operation and Speed Compensated Volume.
Possible Sources
Speed compensated volume setting ACM
PINPOINT TEST C : THE SPEED COMPENSATED VOLUME DOES NOT OPERATE CORRECTLY
C1 CHECK THE SPEEDOMETER OPERATION
Drive the vehicle and observe the speedometer.
Does the speedometer operate correctly?
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.