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Pinpoint Test Av : A Loud Popping Sound Is Heard From The Speakers When Cycling The Ignition: Notes

WARNING: This page is about a different car, the 2016 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.

Diagnostic Overview 

Diagnostics in this article assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to Diagnostic Methods in Service Information for information about these practices.

Refer to Audio System/Navigation , for schematic and connector information.

Normal Operation and Fault Conditions 

To prevent voltage spikes from producing popping noises through the speakers when the ignition is in the START position, the PCM applies voltage to the ACM start sense circuit to mute the audio system output.

Possible Sources 

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