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Drivers door will not lock always up - ML320 Mercedes-Benz Cars & Trucks

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Need more info - year, model and when it happens most often

Posted on Jan 04, 2011

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Posted on Jan 02, 2017

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Door lock dont always work


What door lock doesn't always work ? One or all of them . This is a complex set up for these door locks ! The switch is an input to the BCM - body control module . There is logic involved in the microprocessor , there are relays built in to the BCM ! Could have a DTC - diagnostic trouble code stored in the BCM ! Could be a bad connection at the BCM or master window switch ! A bad ground !
The power door lock system consists of the following components:
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Body control module (BCM)


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DOOR LKS fuse


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Driver door lock actuator


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Driver door lock switch


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GMLAN serial data link


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Keyless entry transmitter


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Passenger door lock actuator


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Passenger door lock switch


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Remote control door lock receiver (RCDLR)


The DR LCK fuse supplies battery voltage to the body control module (BCM) for the power door lock system. The BCM supplies and monitors a reference voltage to the driver and passenger door lock switches through the door lock switch lock/unlock signal circuit. Each door lock switch receives ground at G300 which is also the ground for the door lock and unlock relays located in the BCM. When a door lock switch is placed in the lock position, the reference voltage is switched to ground and the BCM senses 0.0 volts on the door lock/unlock signal circuit. When a door lock switch is placed in the unlock position, the reference voltage is switched to ground through a 1.5k ohm resistor that is internal to each of the door lock switches and the BCM senses approximately 2.9 volts on the door lock/unlock signal circuit. The BCM interprets what position the activated door lock switch was placed in based on the voltage drop.
The BCM, upon receipt of a lock or unlock switch signal, will switch the appropriate door lock/unlock relay coil control circuit to ground causing the appropriate door lock/unlock relay to energize. With the relay energized, voltage is applied to the door lock actuator control circuit causing the door to either lock, or unlock depending on what command was received from the power door lock switch or remote control door lock receiver (RCDLR). When a power door lock/unlock relay is not energized, the switch contacts are normally grounded through the BCM which provides ground to the appropriate door lock actuator for the lock/unlock function being performed. The power door lock/unlock functions are performed by reversing the flow of voltage through the door lock actuator control circuits. The BCM has three internal drivers for the power door lock system. Driver door unlock, passenger door unlock and all door lock. This is done to isolate the driver door lock actuator so it can be unlocked separately from the passenger door. For additional information concerning keyless entry, refer to Keyless Entry System Description and Operation.
This is one you may want to take to dealer or some other ASE certified repair shop ! To do this right you need a Tech 2 scan tool !
Ignition ON, observe the scan tool Door Lock Switch parameter while using the driver and passenger door lock switches. The parameter should change from Idle to Lock and Unlock.
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If the value does not change, refer to Door Lock Switch Malfunction.

Command the doors to LOCK and UNLOCK with the scan tool, the door lock actuators should LOCK and UNLOCK when changing between the commanded states.
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If one or more doors do not LOCK or UNLOCK, refer to Door Lock Malfunction.

Aug 12, 2015 | 2009 Pontiac Solstice Convertible

1 Answer

Skoda doors


replace driver door lock , always try to close door properly

Mar 23, 2014 | 2005 Skoda Octavia 1.6

1 Answer

Drive side power door lock is not working


If the door lock works ok with a key, I would say the lock actuator is failing. Its a small electric solenoid that moves the lock rod.

Jun 26, 2012 | 2008 Hyundai Veracruz

1 Answer

Door latch fails intermittently (1997 Jaguar XK8)


it should be the door selenoid causing the problem it has the linkage attached to it and would give you the problems you discribe

Jul 10, 2010 | 1997 Jaguar XK8

1 Answer

How to release back passenger door lock. Does it rotate in a full circle?


I have a bunch of 94 rodeos, and the locks are normal, up and down type, The driver's door locks the whole car. The rear and passenger only lock themselves, from the inside, from the outside, you have to hold the handle up. The driver's door will lock the whole car but you have to hold the handle up to lock the door. otherwise they all open again.I always use the key on the driver's door. If you are talking about the child proof lock on the inside of the door, it just flicks up and down. The rear door is opened when the glass is up. You have to unlock the glass either from the dash or the key in the back. Hope this helps.

Jun 20, 2010 | 1994 Isuzu Rodeo

3 Answers

2000 Buick Lesbre - Intermittant electrical: Door


THE PROBLEM SOUNDS LIKE LOOSE WIRING CONECTIONS IN THE DRIVERS DOOR , BEST THING TO DO IS HAVE A LOOK OPEN UP DOOR PANEL AND CHECK ALL CONECTIONS, GOOD LUCK

Oct 22, 2009 | 2000 Buick LeSabre

1 Answer

My one door lock button is stuck down and others simply don't wor


You may need to remove your door panels (screws are by the door handle, arm rest, under door and side of door) and then peel back the weather film on each door to see what could be causing the issues.. rusted wires, loose connection, broken linkages, seized linkages. I'm not sure what to do with your car since each door seems to be having a different issue, but I would check the locking mechanisms..

Aug 11, 2009 | 1993 Mercury Topaz

1 Answer

Honda CRV 2002 Power Door lock


try testing or replaceing the drivers door lock actuator, reprogram ur key fobs and try unlocking and locking ur doors. as far as the lights and reminder,....it sounds like a seperate problem. but try the door actuator first (drivers side always act up and cause every other actuator to act up... like a bad kid that gets the rukkus started and ruins things for everyone..

Apr 01, 2009 | 2002 Honda CR-V

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