Noticed on Saturday that the rear door speakers in the Vibe aren't working. The only thing that I have changed was putting in a aftermarket head-unit, which at the time the rear door speakers worked. Where is the factory amp and how do you tell if its bad?
2005 Vibe Base with M&TKenwood KDC-MP342UAvital 4103 Alarm/Remote StartK&N Panel Air Filter, Removed Silencer, TB Coolant Bypass1998 Jeep Cherokee UKFlowmaster Super 44Cobra 25 LTD CB 2 JL Audio 10W0's / TMA 500
Have you checked your connections? You say the "only" thing you did was install a new HU.... That's pretty big.. lol.. especially when the rear speakers stop working... Troubleshooting states that the first thing you should do is to check the install for lose/bad connections..