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Long story short, but I had the check engine light come on, and a beeping start (coming through the speakers). Took the car to repair shop, they diagnosed an "air intake valve" issue. repaired and I get it back and it is still beeping. Repair shop just shrugs and says they can't do any more. Took it home, and isolated it to the RAD No. 3 20 fuse by pulling fuses one-by-one until the noise went away (turning the key off between each pull, of course). The noise stops when the RAD No. 3 20 Fuse is pulled from the engine compartment fuse box. Pulled the after-market stereo, and made sure all the original wiring houses are not connected to anything (all original wires), and the beeping is still there. Also pulled the 7.5A RAD fuse in the passenger compartment and the noise goes away. Clearly an issue with the RAD wiring. Anyone have a wiring diagram so I can chase the wires through the car to see if anything else is connected?
 
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