Citroen Relay door sensor showing doors open permanently (unable to lock)

[Pammy123]

Hoping someone can help me.

Our Citroen Relay (2008) started showing the door open sign on the dash which meant we weren’t able to lock our van using central locking (this has left the sliding door and passenger door permanently open).

We’ve had it in to two garages and this is what has been checked/done so far:

Computer showing back door is the issue
Packed out sensor on side sliding door just in case
New lock mechanism fitted on back door but no change to dash light
Checked continuity in all wires from driver side loom to back door connectors
Repaired some wiring which had broken in the back door loom but still showing door open

Our next step will be to try and cut the wire near the drivers loom to potentially bypass any broken/interrupted wires in the loading area (maybe a screw making contact or hitting some metal and earthing). From the wiring diagram I think I’ve identified the correct wire but if anyone can confirm or tell me I’m crazy that would be helpful!

I also wondered if anyone has had a similar problem and can shine some light on how we can fix this before we start chopping wires!

Thanks in advance
Nicole

Wiring diagram. Wire 2 I believe should be the one to cut.

Larger view of the whole wiring diagram for reference.

[wheeler]

Correct, but ideally you would want to cut it near the BSI end, as if it is earthing out somewhere you will still get the warning. The closer to the BSI you cut it the less wire there is to potentially be shorted out.
Before i went down that route though have you disconnected it at the lock end and at the BSI (big black plug, cat see the numbers that well in the pic) & checked that there is no continuity to earth?

[Pammy123]

Thanks for the input!
Haven’t done that last check yet actually so will give that a go before we start cutting the wires. I’ll let you know how we get on

[Cattis]

I have the exact same problem.
Where do I find the drawings for the wires please?
Is there a way to lock everything manually?

[Pammy123]

We actually got them from a garage which tried to fix the problem. I requested them from them and thankfully they were able to download them for free. I’ll attach the pictures here for what we have (just a few relevant pages.)

We haven’t found a solution for our passenger door or the sliding door yet but have been able to manually lock the back door and the drivers door. We’re just sitting ducks at the moment! Next step for us if the wire cutting doesn’t work will be dead locks for the 2 remaining doors

[Pammy123]

FIXED IT! Sort of.

We cut the wire labelled number 2 on the diagram which is a very tiny/thin blue and white cable which runs from the switch in the back door through to the BSI. We cut it at the drivers side loom and hey presto! Central locking works and the door sensor is now disconnected. We believe there’s a break in the wire somewhere in the loading area, potentially caused by a screw or maybe corrosion but who knows.

It’s not a permanent fix but it will do for us for now! I guess a permanent fix is to rerun some new cables to the back door but that’s a future job.

Pictures of the wire we cut for reference.