Picture of a new F82 M4,,, the customer complained about comfort access not working at all,,,,which was pretty strange do to we usually get one of the door to work,,,,but never the whole system is shut down,,,,,checked fault found short circuit in system for comfort access,,,,first thing I think a rat has been in here and chewed some wiring.  Sure enough I found the damage wiring,,,,it was under the driver side lower rocker panel,,,,,he had chewed the wiring harness to the drivers comfort access signal antenna,,,so taking off the lower rocker panel is not to hard,,,,just some clips and pop off the panel to gain access