BenzWorld Junior Member
Date registered: Aug 2008
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If you can get to the connectors for the left and right amp outputs reverse them and see if you now have sound on the drivers side and none on the passenger side. If so, its an amp problem. If not, its likely the speaker.
Your only other option, really is to pull the door panel and test the speaker to see if its good and work backwards to the amp. If water has gotten to the voice coil, its probably done. If you pull the leads off the speaker thats not working and onto a known good speaker, and it works, it was the speaker. If it still doesn't work, its either the wiring harness back to the amp or the amp.