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After having the battery disconnected for a couple weeks on my '03 Z06, my key fobs don't work any longer, even with fresh batteries.
I've tried a few times to reprogram through the DIC, as well as trying to resync by holding the buttons down for 15 seconds, with no luck.
It seems there is no communication between the computer and the RFA box - the little black box behind the left rear fender that controls the key fobs. I've verified that it is properly plugged in, still nothing.
I didn't see the box myself. But I was told it is in the driver's side rear of the car. Possibly accessable via a cover in the rear hatch? I think there's also a fuse for it somewhere....