Help please. I own a 2007 ML350. I noticed the other day that the passenger side seat controls were not working. The first thing I did was check that the wiring harnesses under the seat were connected properly. I removed the long yellow one and refitted it. Still the controls did not work, moreover, the SRS fault light came on the dash. I have checked the 30A fuses in the rear fuse box and there is no power to the fuse position 27. I'm guessing a relay has failed. Problem is the location of the relay seems to be a MBZ national secret. Or is there something else wrong with it. Can anyone help ? Thanks.