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I just bought a 2000 C5. The keyless remotes did not work when I picked up the car. The sales persons said the battery may dead, or they had lost their programming. Batteries check good. Does anyone know how to reprogram the remotes?
Then push the unlock and lock button ( while standing close to your C5) at the same time. Wait approximately 30-45 seconds. The horn will sound. When it does you will be re-sychronized with the C5. If this does not happen...