The car player doesn't affect any of the Mercedes/BMW's/Audis/VW's that we've seen (I believe that CCA have installed empegs into all of those cars).

The player is FCC and CE approved, which involved a very thorough EMC test procedure. Of course, the player fully passed these tests. It seems unlikely that it's a radiation issue, but I'm not sure what else could cause it. Do you know where the door lock receiver is located in your vehicle?

Rob