Rainer Schuett

After a longer period of storage of my CLK 320 2005, the battery died totally, so I had to try the physical key to get access. The key turns alright, but the lock pin does not rise, so I still cannot open the door. Anyone out there experienced a similar problem and has a solution?

emoore924

If you have a coupe, use the key to open the trunk, the pop the seat backs and climb in through the trunk...

Rainer Schuett

Thanks for the hint. Unfortunately, my W209 is a cabriolet

emoore924

Oh well, worth a try :P

JoiseyBenz

It may sound crazy, but how about this...

Jack up the car in the front - jack stands, etc. for safety.

Try to find the location where the positive battery cable connects to the starter. Attach a jump-start to that, and the negative to the frame somewhere. You would probably just need a small amount of ooph to operate the door lock receiver.

ANOTHER possibility. I just saw a video on www that showed:
1) put physical key into door and turn left all the way.
2) Continue to pull/release the door handle several times. After a bunch of pull/releases it might get the door to unlock.
Supposedly, this approach is a 'security mechanism' by design.

Rainer Schuett

This is an interesting approach, I will try it as soon as I am back home. I have done the very same procedure before, with the only difference that I pulled/released the handle only a couple of times. Could this be a pumping action for a hydraulic actuator?

Rainer Schuett

By the way, do you have the access address to the video you mentioned?

JoiseyBenz

Rainer, The fellow in the video pulled the handle about 15/20 times until it opened. He also claims that the reason you have to do it so many times is because of some 'security mechanism' built into the Mercedes vehicles.

Here is the link:

Rainer Schuett

Well, it was definitely worth a try. Sadly enough, it didn't work.....
Next step is "to call the guy".

JoiseyBenz

Rainer, I like to do whatever I can to figure out HOW to do it, before I hand my problem off to a 'professional'. If it were me, I'd continue looking on www for other answers. I wouldn't be surprised if they charged you from $50 to $100 to get it open, and it'll probably take them 5 minutes because a dealer (or auto locksmith) surely knows all the tricks.

Here's a MB dealer who is basically suggesting what I said, to apply some power to the system (at the right place) - just enough to get the lock working.

Take a look: https://www.arrowheadmb.com/blog/how...-dead-battery/

HETPE3B

It doesn't matter if it's a coupe or a cabrio. Both trunks can be opened with the key.

emoore924

Yes, but I think only the coupe has seats you can crawl through from the trunk?

HETPE3B

If you refer to climbing from the cabin into the trunk area then yes - only doable with Coupe I though you referred to the trunk lid.