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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1041 (Entertainment System - General Information -- F150 Pickup) >> Diagnosis And Testing >> Audio System >> Pinpoint Test E: Loud Popping Sound When Cycling The Ignition Switch >> Normal Operation

Normal Operation

WARNING: This page is about a different car, the 2005 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.

The start input circuit 1000 (RD/BK) is sent to the audio unit when the ignition switch is turned to the START position. The audio unit then immediately mutes all speaker amplifier outputs and the subwoofer amplifier enable circuit output to eliminate the possibility of speaker pops during engine cranking.

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