We have a JVC KD-S570 car stereo. My husband locked his keys in the truck and about 3 days later he recieved the extra set I mailed him. When he got into the truck he realized he had left the key in the on position. He had to have the truck jump started and left it running for some time. The stereo has not worked since. It keeps coming up with an error message. The deck is only about 3 years old and worked great until now. The manual it came with is lost and no one at circuit city (where we bought it) seems to know why this would happen.