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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 432 (Entertainment System) >> Diagnosis And Testing >> Entertainment System >> Symptom Chart >> PINPOINT TEST G: The Subwoofer is Inoperative-- Navigation Audio Unit Only >> Normal Operation

Normal Operation

WARNING: This page is about a different car, the 2004 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.

The subwoofer speakers are powered from a separate subwoofer amplifier. The clip detection circuit, 7-MD19 (YE/RD), carries out two functions: to turn on the subwoofer amplifier, and to indicate to the audio unit when the subwoofer output distortion signal reaches a damaging level. The audio unit then reduces the audio output signal to the subwoofer amplifier.