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I drive a 2001 Mercedes Benz ml320 and I have recently encountered door lock problems. One: the driver side lock will not go down and I believe this is a problem with the actuator. Two: I cannot unlock and lock the doors with the switch( I believe a problem with the button) three: my keyless entry has stopped working and I need my alarm because of potential threats in my neighborhood
 

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99 ML430, 00 ML320, 05 E500 4matic Wagon
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It could be multiple issues. First fix the lock. Then check the batteries in the remote.
You can do that without taking them out of the remote. Many car parts stores have
a tester that measures the signal strength when you push the buttons on the remote.

Or if you have a second key see if that one at least locks the doors except the faulty one.

If the batteries are bad and the remote can not be resynced after changing them then post
back. There may be an issue with a module on the truck. First thing is to tackle the bad lock.
 
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