My '05 Limited coupe's locks don't automatically anymore when I start to accelerate. I've checked the fuses and they all seem fine. Any ideas... like some sort of manual override I accidentally triggered?

 

Are your doors locking with the remote? The locking mechanism is pneumatic could be a leak or even a corroded terminal on the sending or receiving unit and the signal to lock at speed is lost. The air pump is located in a pretty terrible spot. To locate it remove all the stuff in your trunk floor and under the foam on the passenger side is the unit. It tends to be subjected to moister being that the rear compartment vent is right there. I would have done the same as you by starting with fuses not to make you sound dumb I'm sure you looked but you do know that there are 2 sets of fuses one under the hood and one on the driver side behind the headlight switch right? Nothing like missing something this simple and dragging a problem out for weeks ya know lol

 

Not saying ...... but the fuses in the dash are mainly for lights except for interior dimming mirror (04's) and speed control.

 

http://mbworld.org/forums/slk-class-...ay-locked.html
This describes a problem with the pse although it's on an slk 230 it's the same unit

 

Or it could be the really simple version..

Automatic Central Locking

The central locking switch also operates the automatic
central locking feature. With the automatic central locking
feature activated, the doors and rear liftgate are
locked at vehicle speeds of approximately 9 mph (15
km/h) or more; however, the fuel filler door remains
unlocked.
To activate this feature, turn the key to the ON/RUN
position and hold the upper portion of the switch for a
minimum of five seconds. To deactivate, turn the key to
the ON/RUN position and hold the lower portion of the

switch for a minimum of five seconds.

 

You beat me to it. LOL
Amazing what's in the Owners Manual.

 

Well due to our age difference.. I gave you a 2 hour head start! LOL...

 

Warning.. if you experience door lock problems, please take a notebook or smart phone with you to the car to do your checks. Apparently the OP on this thread is now locked in his car, thus the lack of any response!

 

lol ...............

 

It might be the battery. Did you notice that his spoiler is stuck in the "UP" position?

 

Is that in another thread or do I seriously need to invest in glasses?

 

No, Max is getting old like the rest of us. He saw jmk41's picture and it stuck in his brain ......

 

Whooopsie!

 

I appreciate your help but am a little upset that you all knew I was helplessly trapped in my car and did not call the fire brigade. I was able to survive on potato chip crumbs in my door sill and by collecting the dew that formed on the inside of the windshield each morning. While I am now free (thanks to the deer who plowed into my passenger side window; proof that deer are the most retarded of any animal) the automatic doorlook is still being an issue. I did read that the central locking switch can be activated/deactivated but there's also a few sidenotes about it. I turn the key to on, press the upper half of the lock switch for five seconds, and then start the car and accelerate...nothing. It seems, at least for now, I will have to stand ever vigilant and remember to perform the arduous task of pressing the button myself. Now, onto the throttle body project...

 

Lesson to be learned here.. we have no location in your profile.. and 911 gets testy if you tell them.. "look for a guy locked in his Crossfire!". In fact..using a pay phone from a remote location to report this is really your best option. I did note in your response..you forgot to put it in gear!

 

I sometimes forget that with how fast my crossfire looks sitting still.

 

Mine has never locked automatically at 10MPH. And the activation method posted above also does not work.

 

My problem ended up being the fuse. #26, a yellow one. Replaced that and it worked fine.

 

Thanks......I'll have to check it and report back. l

 

Fuse #26 is for Central Locking. If blown, you would not be able to lock your car period. Mine is fine.
Could be BCM related