While driving or when the car is parked. My '92 400E unlocks all the locks even, when I have parked it and locked it. I come back to see it unlocked. It also happens about 10 or more times while I am driving. Any ideas how to remedy this? Where is the control unit (electrical) to lock the doors. I am assuming it is electrical even, though the locs unlock by vacuum. I had the fuel door and trunk actuators replaced about a 1 and 1/2 yrs ago when, they were leaking. Checked both. I was going to check doors but, couldn't take it off. Dealer did door strap mod and I think they glued the inside door panels. It seems that way unlike, my 560 SEL which, just had snap pins and screws holding it down.