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Home >> Mercury >> 2008 >> Milan Base, 3.0 1, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 202 (Entertainment System - General Information) >> Diagnosis And Testing >> Audio System >> Pinpoint Tests >> Pinpoint Test H: The Subwoofer is Inoperative >> Normal Operation

Normal Operation

WARNING: This page is about a different car, the 2005 Mercury Montego, 2005 Ford Freestyle, and 2005 Ford Five Hundred. However, it is still accessible from the selected car via links, so may be relevant.

The subwoofer speaker is powered from a separate subwoofer amplifier. The enable/clip circuit, 174 (GY/BK), carries out 2 functions: to turn on the subwoofer amplifier, and to indicate to the audio control unit when the subwoofer output distortion signal reaches a damaging level. The audio control unit then reduces the audio output signal to the subwoofer amplifier. The subwoofer amplifier receives voltage on circuit 1678 (WH/VT) and ground on circuit 1204 (BK/OG).

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