First check the wiring for door lock if all good faulty door lock must need to be replace.
Ml500 door lock problem.
64 people reported this problem.
Plugged in new door actuator and tried the fob.
Check your fuse box first to determine if a blown fuse is keeping the lock from working.
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Now press down on the unlock button in the center console to lock the doors for at least 10 seconds and this will.
All doors lock bu read more.
Front passenger s on mercedes ml 500 wont lock.
Sign in to reply matte on october 26 2009.
Problem description 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.
On mercedes ml500 2002 trying to put in another drivers side door lock.
If just one lock won t open on your mercedes then the problem may rest with broken wiring a bad solenoid or perhaps with a blown fuse.
Don t start the car yet.
Turn the key to position 2 all your cluster lights are on.
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The affected door latch should be replaced to correct this concern.
You ll probably need to take it to a shop to get fixed.