Alarm 1991 mercedes benz 300E will go off after all the door luckup by itself after a min or so while driving or idle. The Car still runs with the blinking and horn got crazy....

Only way to avoid the alarm go off is to keep the Driver door "opened" while waiting for other 3 doors lockup automatically .....

It seems it would happened when I have the passenger side (door)unlock...

Please help.