What sammonilla said,
In addition, this is what I got from engineering....
"Well the red wires are the 12v connection. Its spliced onto a 14 gauge wire that runs to the battery control center (BCC) on fuse F7 (AUX). the blue wire is the remote wire that connects to the rear of the dash radio to turn the subwoofer on when the radio is powered on. So you have done the basics by identifying power coming to the subwoofer. Some possible checks are to pull the subwoofer connector back off and check to see if all pins are pushed into the connector. Also confirm that you have ground on the black wire that’s also in that harness. To check for ground, use the OHM/Voltage meter and put the positive lead on the red or blue wire pin and the negative on the black wire pin. You should read either the 0.07v or the 12v based on which wire the positive lead is on. If these methods have been tried and the subwoofer still doesn’t work then the amp on the subwoofer may be faulty."
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