General: Deadlock Problem

[FredGraham]

Hi all, I apologise if this post is in the wrong place. I own a MY2006 C70 and for the third time now the passenger door deadlock has failed to disengage. Not much of an issue when I'm alone but a right pain if I have a passenger. It's been fine for a couple of weeks and stayed locked when I unlocked this morning. (Using a remote). Any ideas as to what may cause this as I'm too much of a technophobe to even consider possible causes. Thanks in advance.

Just tried it with the key, seems to have cured the problem for now but any other reasons would be appreciated.

[FunkyMelon]

Open the passenger door and give the big black connector behind the door (closest to the glovebox) a good wiggle.

That controls all the COMs to that side of the car, you'll likely have lost passenger window controls as well if this is the issue.

Quite a common fault on pre-facelift cars.

[FredGraham]

I haven't noticed a loss in the passenger window controls, at least when operating the window with the drivers door control. What I have experienced with the passenger door is that the window drops on opening the door but then doesn't close when the door is closed. A wiggle on that "big black connector" usually solves this, eventually. I probably need to uncouple it and give it a spray with a contact cleaner.

[MDS40]

Unplug it use contact cleaner then silocone.
It cured my locking and window problem and also the crazy ambient temperature readings.

[marc]

I kind of have a similar issue...well, in that my passenger side deadlock is literally dead and doesn’t double lock that door. I can’t remember how much I was quoted, but I was in need of a new controller, I’m pretty certain this is what you’ll need too.

[FredGraham]

Originally Posted by marc

I kind of have a similar issue...well, in that my passenger side deadlock is literally dead and doesn’t double lock that door. I can’t remember how much I was quoted, but I was in need of a new controller, I’m pretty certain this is what you’ll need too.

Similar in that it is a deadlock issue, but mine are working most of the time. It's worked as it should since I used the key to unlock the door.(Saw this remedy on another thread somewhere on this sight). So hopefully a couple of sprays will sort it for the foreseeable future.