LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Mercury >> 2005 >> Mountaineer 2WD V8-4.6L SOHC VIN W >> Repair and Diagnosis >> Accessories and Optional Equipment >> Radio, Stereo, and Compact Disc >> Testing and Inspection >> Pinpoint Tests >> Test C: Poor Quality/Distorted Sound Or No Sound From One Or More Speakers (Not All Speakers)

Test C: Poor Quality/Distorted Sound Or No Sound From One Or More Speakers (Not All Speakers)

PINPOINT TEST C: POOR QUALITY/DISTORTED SOUND OR NO SOUND FROM ONE OR MORE SPEAKERS (NOT ALL SPEAKERS)


C1-C2:






C3:






Normal Operation
The audio unit directs the audio signals to the speakers through separate positive and negative circuits for each of the 4 audio channels: LH front, RH front, LH rear, and RH rear. The audio unit provides internal circuit protection for shorts to ground, shorts to B+ battery, or shorts between any output circuits.

Possible Causes
- circuit 800 (GY/LB) open or short to ground
- circuit 801 (TN/YE) open or short to ground
- circuit 802 (OG/RD) open or short to ground
- circuit 803 (BN/PK) open or short to ground
- circuit 804 (OG/LG) open or short to ground
- circuit 805 (WH/LG) open or short to ground
- circuit 811 (DG/OG) open or short to ground
- circuit 813 (LB/WH) open or short to ground
- speaker(s)
- audio unit