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What sanity?
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The outer two wires are power and ground (red and gray on the speaker side, respectively) while the middle two are the speaker level signal from the head unit.

If you have power on the outer two wires, and the dash speakers work, the amps on the door speakers are faulty. Most likely bad solder joints - it happens a lot on these. They will likely be full of rosin, so repairing them will be tricky. More often than not, though, they can be repaired as long as you can deal with all the rosin in there.
 

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What sanity?
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3,705 Posts
Ah, one of the newer ones. The extra two wires go to the dash speakers... the crossover circuitry is in the door speaker amp.

I would check for continuity across the woofer voice coil terminals. If good, the woofers themselves are ok and the amp is not working properly. If bad, the amp may be working but the woofer voice coil is open.

Either way, I'm thinking you'll have to replace the door speakers.
 

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You can get that in a factory service manual, look for one on eBay.
 
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