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Floobydust
Veteran
Date registered: Mar 2014
Location: Massachusetts, USA
Vehicle(s): 1995 E320 Cabrio, 2003 G500, 2000 SL500, 1980 TR8
Posts: 284
| Intermittent Door Lock Actuator
The door lock actuator on my right front door has become intermittent as of late. It will work fine for several days and the stop working for several days and so on. The lock mechanism if free to move and locks/unlocks manually just fine. When the actuator is not working you can hear a click inside the door which I think might be the might be a relay in the door controller, but I'm not sure about this. My theory is that the lock/unlock command is sent via the CAN buss to the door controller which in turn activates the door actuator via a relay. Does any one know if the system actually works that way or is there a direct connection to the actuator?
Also, does anyone have experience with their lock actuators failing intermittently like this or do they just die and stop working when they go? I'm trying to decide if I should order and actuator before I open up the door panel (not easy in the dead of winter - may have to wait until spring).
Thanks!
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ychung
Veteran
Date registered: Aug 2015
Location: SO CAL
Vehicle(s): 2004 G500, 2014 ML350, 2008 S550
Posts: 196
| RE: Intermittent Door Lock Actuator
I had a similar issue a few months ago. I didn't have any problem with locking the door, but unlocking was on and off. When it didn't work, it felt like it just didn't have enough push to open it.
I've installed a new actuator and problem solved. However, when I was putting it back together I've noticed that one of the connecting rod that actually pushes up the rod to open the door wasn't clicked in to mounting hole (I wish I had taken the photo).
If I were you, I'd buy a new actuator, however, I'd check all connecting rods before installing a new one. I don't think it hurts to have a spare actuator.
Also, please have a few door panel retainer ready as I needed three replacement. |
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King_GH
Extreme Veteran
Date registered: Oct 2011
Location: London
Vehicle(s): 95 G300 RHD
Posts: 324
| RE: Intermittent Door Lock Actuator
One of my doors - passenger was acting intermitently and somehow cause the whole central lock system to stop working. I replaced the actuator but stil haven't managed to get the central locking system to work. It's a real pain as I have to keep asking passengers ( my family ) to lock the doors and then I have to double check that they did lock it. Does anyone know what could cause the central lock to stop working all of a sudden? |
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AlanMcR
Expert
Date registered: Apr 2006
Location: US, CA, Los Altos
Vehicle(s): G300DT E300DT 230SL
Posts: 3500
| RE: Intermittent Door Lock Actuator
Probably bad solder joints on the Kiekert central locking relay. Here is a thread, in German, on the problem/cure: http://www.viermalvier.de/ubbthreads.php/topics/470009/Re:_Relais_u...
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King_GH
Extreme Veteran
Date registered: Oct 2011
Location: London
Vehicle(s): 95 G300 RHD
Posts: 324
| RE: Intermittent Door Lock Actuator
Thanks Alan
The article actually refers back to one here called "My central lock quit working today" .... Funny I noticed I had asked a similar question on it.  Central locking is probably not the most resilient feature on the Gs. It appears I had the same problem on my previous G but I can't remember how I fixed it 
Edited by King_GH 3/13/2018 5:25 AM
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Luky
Elite Veteran
Date registered: Apr 2006
Location: Bratislava, Slovakia, EU
Vehicle(s): 300GE LWB auto, E320CDI 4M, VW Polo Classic 1.6
Posts: 1062
| RE: Intermittent Door Lock Actuator
Hi Alan, KingGH has a 95 300GD and I tought there was no central locking relay until about ´96. AFAIK everything is controled by the main accurator in the driver´s door on the the W460 and first W463s.
http://www.kurth-classics.de/mercedes-g-zentralveriegelung/
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King_GH
Extreme Veteran
Date registered: Oct 2011
Location: London
Vehicle(s): 95 G300 RHD
Posts: 324
| RE: Intermittent Door Lock Actuator
Hi Luky
That was a very useful article. So will you suggest I start investigating from the 'suspect door' or start with the driver's?
thanks
K |
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Mattdedasc
New user
Date registered: Apr 2018
Location: Newcastle, UK
Vehicle(s): G55 AMG, Porsche 996, Harley Street Glide, KTM 450
Posts: 3
| Re: Intermittent Door Lock Actuator
I just had this happen the other day (2008 G55). I sprayed all the areas (latch, lock, behind handle, door pin) with WD40 and 2 hours later it worked again. Worth getting a new actuator just in case.
Would you know the part number? Right side door. Thanks |
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ychung
Veteran
Date registered: Aug 2015
Location: SO CAL
Vehicle(s): 2004 G500, 2014 ML350, 2008 S550
Posts: 196
| Re: Intermittent Door Lock Actuator
Part# is 0048202542 |
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Mattdedasc
New user
Date registered: Apr 2018
Location: Newcastle, UK
Vehicle(s): G55 AMG, Porsche 996, Harley Street Glide, KTM 450
Posts: 3
| Re: Intermittent Door Lock Actuator
ychung - 4/18/2018 1:16 PM
Part# is 0048202542
thanks. It has been working well now since the WD40 soak. I'll keep the P/N for future reference. |
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thebigblue
Date registered: Jan 2012
Location:
Vehicle(s):
| Re: Intermittent Door Lock Actuator
That's an expensive bugger, been searching e-bay for an alternative - no luck. Anyones has an alternative source to MB? |
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djdinaz
Extreme Veteran
Date registered: Jun 2007
Location: Arizona
Vehicle(s): 03 G55
Posts: 439
| Re: Intermittent Door Lock Actuator
Anyones has an alternative source to MB?
Vlad has a two-wire aftermarket one for a fraction of the OEM price. See: http://www.fourbyfourclub.com/W463ElectricalParts/W463ActuatorDoorA... |
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King_GH
Extreme Veteran
Date registered: Oct 2011
Location: London
Vehicle(s): 95 G300 RHD
Posts: 324
| Re: Intermittent Door Lock Actuator
From the description on fourbyfour, the rear actuator in my 95' can't be used for the driver. Has anyone got the number for the 95 driver side? I may need to pysche myself to buy that if the WD40 method doesn't work for me. |
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