C4 grand Picasso door fault

[GiveMeABreak]

No need for programming these door control modules (but you MUST get the correct unit / part number for your vehicle), but be aware that the driver's door modules are linked to control the passengers mirror, windows and rear windows / and door locking.

My mirrors stopped working - after it came back from the body insurance shop - whatever they had done, one of the door control unit connectors underneath the module had come off, so that was reconnected and all fine again.

[Ryanoneil11]

Just to let you know i changed the door control module in the passenger door its seemed to work like it should so not convinced it needs programming.
Please up date us if this work for you all fingers crossed

Just a quick one when the cars running I'm guessing it says both doors are open, but when you switch the engine off does it change just the passenger door open ?
This to me doesn't make sense as when its on the computer live data passenger door is opening/ closing as it should and shows the drivers door always closed on live data.

Im still trying to locate this relay i was told about which could be jammed- I can take these doors off in about a minute and a half now iv got that good at it

[GiveMeABreak]

They don't need programming, who tried to convince you?

[Ryanoneil11]

Any update on this problem we are having ???

[keithkenny]

Hello having the exactly the same fault here wondering has anyone managed to solve this problem

[Ryanoneil11]

unfortunately not, I have tried and tried looks like a very common problem. Would love to get to the bottom of it

[Ryanoneil11]

Finally got down to the bottom of this fault after trying everything, It was the wiring in the drivers side door.

Easy enough to take the door off x2 pins and recommended helper and support under the door for ease, 3 minute or less job

A few cables worn (and repaired ) the wire causing this doors open fault is the red one on the picture.

Spent many of hours trying to find this problem and replacing parts- so hope this helps someone as I know this is a common problem on these cars.

[Wishdoctor]

Wow Ryan, well done.

I have to be honest and say that I have just been ignoring the errors. I suspected a wiring fault so will likely take your lead and take the door off and have a look. it is very frustrating given the amount I have spent on door locking controls, controller unit, Citroen diagnostics, mechanic time.... all to still have the same problem.

I'm not surprised it may be wiring though, the method used in these cars to pass wires through doorframes leaves much to be desired. I have the wires leading into the boot fully exposed at the moment as the concertina rubber conduit has ripped. (and the corrugated pipe for the window washer water has also broken there)

I will wait for a day where I won't swear too much at the cold and will give it a go.

[Mcr repairs]

Had one of these faults on a c4 grand,
I removed the door which has 2 plugs if you pull the black rubber back next to door post, also remove the torque screw on the door strap thing and remove the pins, 2 man job. There was a red wire which had broken, soldered etc, cleared codes job sorted. On the dash it said both doors were open even when closed. Hope this helps

[funnyname]

I had the exact same issue and with the help of an electrically minded friend we solved it however, we weren't able to solder a few broken wires as 3 of them were the same colour and we couldn't make out the markings to differentiate them so we left them and hoped for the best.

After we put everything back together and started the car, the open doors fault was gone but unfortunately, the drivers window isn't moving when the button is activated, all other windows go down/up from the drivers door. It was suggested to me that the best way to match the wires is to get a magnifying glass to see the differentiating markings. Does anyone have any other suggestions?

[mickthemaverick]

I'd connect a multi meter to each wire from the car in turn while ignition on and operating the window switch. Hopefully you will ID the up and down wires, the third wire will be for something else which is not working, mirror maybe? Then touch the 'up' wire to each wire going into the door in turn and see what happens. Once you ID the up and downs the remaining wire can just be reconnected as the only option left!!

[funnyname]

I'd connect a multi meter to each wire from the car in turn while ignition on and operating the window switch. Hopefully you will ID the up and down wires, the third wire will be for something else which is not working, mirror maybe? Then touch the 'up' wire to each wire going into the door in turn and see what happens. Once you ID the up and downs the remaining wire can just be reconnected as the only option left!!

Is there a danger that sending the incorrect frequency/voltage to a wire might fry something or given the 3 wires are all the same colour that they would carry the same frequency/voltage?

[mickthemaverick]

Firstly frequency does not come into it as you are talking 12V DC electrics. As a safety measure you could test each of the wires going into the door by connecting your multimeter on resistance scale and check the resistance between each of those wires and a known earth, the door hinge mounting bolt is a good place, and see if any give a 0 ohms reading. If they do then do not connect the live up wire you identified from the live testing to that wire as you will probably blow a fuse. You should see the resistance of the window motor on the two up and down wires and whatever resistance the unknown component is on the third wire.