Aftermarket stereos may still use the factory wiring if your van came with it. Factory wiring routed 3 of the 4 rear speakers through the door hinge wiring. Any of those doors wiring can be the culprit as the wiring can break through years of flexing when the door opens.
With that being said, ALWAYS check the easiest things first. The low hanging fruit, as it were. And my first question would be if any work has been done on or around the speakers not working? Door panels removed and speakers disconnected for any reason? Side doors? Rear doors?
If the answer is no, this is the order I would follow;
1. Settings on stereo
2. Connections to Speakers
3. Connections of Speaker Wiring to Stereo (Especially if aftermarket head unit has been installed in the past).
4. With steps 2 and 3 looked at, the Speakers and Stereo are now out in the open, and you will have easy access to the wiring to test its integrity.
Good luck.
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Tim Potts
2012 Chevrolet Express 3500 6.0
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