I can't think off top of my head if that piece is replaceable on it's own or you need to replace the whole dash board

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Your OBC needs to be reset i think, how many buttons does it have, if it's six button turn the key to on, don't start the car, and set your time and date. see below link if it's the older kind or just for general idea.
http://www.strictlyeta.net/technical/obcfunctions.html
P.S. Remember any time you disconnect the car battery the OBC will need to be reset.