Electrical switches in the door latches can fail, causing the door locks to rapidly actuate up and down multiple times when the locks are activated by either the keyless remote or door lock switch. The affected door latch should be replaced to correct this concern.
Car Problem Reports
Mercedes-Benz ML350 Electrical Switches in Door Latches May Fail
Mercedes-Benz ML350 Problem
Average Mileage: 80,640 mi (39,000 mi - 170,000 mi)
Visitor, 2006 Mercedes-Benz ML350, 78,000 mi
Front passenger door doesn't lock. Actuary switch needs to be replaced. $750 repair.
Visitor, 2006 Mercedes-Benz ML350, 79,000 mi
Rear passenger door would try several times to lock causing a rapid fire like noise. I operated the lock manually and noticed it had more resistance than the others so I decided to clean the mechanism with WD40 and then lubricate it with a spray can of white lithium grease. Going on two months now and it is still working fine. Took all of five minutes.
Visitor, 2003 Mercedes-Benz ML350, 64,000 mi
On my 2003 ML350 the passenger front door fires several times and then fails to lock. You can't even lock the door manually which is a safety concern. I felt it was unsafe to let my family ride in this car when the door couldn't be locked and we could not leave the car unattended which was a unacceptable situation when you are out of town over the holidays. We couldn't get it fixed because shops were closed and we couldn't leave Christmas presents in car because we were afraid someone would steal them.
Visitor, 2006 Mercedes-Benz ML350, 55,100 mi
Passenger side door lock would rapidly engage/disengage several times when either using keyless remote entry or when using auto lock when driving. Had to replace lock mechanism.
Visitor, 2003 Mercedes-Benz ML350, 76,000 mi
Right passenger door activates door lock multiples time every time I drive car away.
My driver door does not lock or unlock! I have to manually lock and unlock only after door is closed ( crawling in from passanger side or back seat) The security system does activate! So if anyone tried to open one of the doors it would trigger the alarm.
Visitor, 2008 Mercedes-Benz ML350, 64,000 mi
Passenger door lock sensor says that the lock is opened even though the door is locked. When driving and stopping the door locks will open and close rapidly a number of times. Was told that it is not the door lock but the Signal Activation Ignition Module that is defective.
Visitor, 2004 Mercedes-Benz ML350, 70,000 mi
FRONT PASSANGER SIDE DOOR LOCK IN NOT LOCKING EIGHTER ELECTRICALLY OR MANUALLY. MAKES MACHINE GUN LIKE NOISE WHEN SWITH ON TO LOCK. THIS CAR IS PIECE OF JUNK FOR THE MONEY WE SPENDS. DO NOT BY ANY MERCEDES. IT IS NOT WORTH
Visitor, 2006 Mercedes-Benz ML350, 120,000 mi
This is the second time this has occurred.
The first time was the left rear door and now the right door.
It cost me $500 to fix it the first time.
So much for German engineering.
Visitor, 2006 Mercedes-Benz ML350, 50,750 mi
Rear passenger door lock "jackhammers" and does not lock. No problems with the other doors.....yet. Dealer estimate to fix the rear passenger door is $755.00.