I been having a issue with rear left door lock on my 2009 c300. For awhile it didn’t work at all and then it worked properly for a month or so,now it unlocks when you hit the unlock or lock on the remote ,keyless go or the switch inside the driver’s door but it will only lock manually. I was sure it was the actuator so I changed it out, didn’t solve the issue. Pulled the fuse on the keyless go the issue was still there. Can’t seem to get any information on where the door lock relays may be located on this car. Other than that it has to be a wire issue. Any information or suggestions would be greatly appreciated.

 

Just curious what was the cost of the door actuator?

 

I got it on Amazon for $100 Canadian. Just the actuator not the whole set up like MB sells. It’s exactly the same. Bit of a job to change though.