Quote:
Originally Posted by Simon Jones
There will probably be a small CMOS battery on the PCB inside the DVD drive which has probably leaked or just failed.
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However another likely possibility (I've never had mine apart so I don't speak with certainty here) is that it makes use of non-volatile storage technology (i.e. similar to that used in USB sticks and such devices), as do many of the vehicle's other modules and sensors which need to retain reconfigurable programming and settings when not powered. IF that is the case, then you'd be looking a component level repair to the affected board, if that were even possible.