Sliding door lock

Isaac_Blanc · 2025-05-17 12:02:46

Electrical locking mechanism is broken on my sliding door. Gonna remove the mechanism today & have a look. Any idea what I should look for? Any ideas for how I can test it? I would like to confirm that its a problem with the lock unit rather than with the wiring that runs to it, before I buy a replacement.

Isaac_Blanc · 2025-05-18 12:37:36

I couldn't fix it and shall order a replacement, but here are some photos from taking it apart.

It comes out of the door pretty easy. Its attached to two pull wires for inside & outside door releases. There was also an electrical cable plugged into it, but I've unplugged that in this photo.

The grey cover comes off fairly easily. Photo below of the internals. I have drawn a red circle around the microswitch. There are also two motors, which can override/lock either door release.

The lock works via this pin. When the pin is down (left photo), the latch is unlocked. When the pin us up (right photo), the latch is locked.

This lever pulls the pin down when one of the door releases is pulled (blue arrow). It can be overridden by this gear being turned by the motor (red arrow, circle).

This lever pulls the pin down when the other door release is pulled (blue arrow). It can be overridden by a different gear being turned by a different motor (red arrow, circle).

In either case, the door releases will not open door if they are 'overridden' by their respective motors. The motors can be pulled out of the frame by hand. I tested them like this with a 12V 0.5A limited power supply. Both work fine. You might struggle to get them back into the frame in without damaging anything.

Last edited by Isaac_Blanc (2025-05-18 17:11:48)

Eddie Honda · 2025-05-18 15:20:08

Interesting pictures. Does the electric to the lock get fed through a spring-loaded contact? (I'm not familiar with the 'new' ones.)

Isaac_Blanc · 2025-05-18 17:21:23

Just added the rest of my pics.

No, the electrics to the door all go through this cable drag chain.

Isaac_Blanc · 2025-05-18 17:44:37

Right so here's the problem. Was just looking for a new part online and noticed that mine (left photo) is missing this bit that is present in the replacement parts (right photo). I actually saw that bit lying on the floor when I disassembled this. Looked like it had sheared off. I think it relates to the gear used for locking the first door release shown above.

Nomad Saddle Bags · 2025-06-17 18:26:13

Wow, this is such a coincidence, I was looking for a forum to ask about the issue I have with my new van and it looks like I have exactly the same issue.

Did you manage to fix the missing part? Or did you replace the whole unit?

kenbw2 · 2025-06-17 18:44:23

Nomad Saddle Bags wrote:

Wow, this is such a coincidence, I was looking for a forum to ask about the issue I have with my new van and it looks like I have exactly the same issue.

I'm always surprised this forum has such a good following for its little niche

Isaac_Blanc · 2025-07-16 22:20:37

Sorry for the long (and late) reply.

I was unable to fix the unit so I bought a replacement on eBay for £80. I fitted the replacement, which was easy, but didn't fix anything. The new locking unit behaved in the same way as the original one. I figured it was an electrical problem in the wiring that runs between the lock and a computer somewhere in the van. I noticed that my cable drag chain (shown previously) was in a bad state. Perhaps the wires inside of it were snagged? Perhaps there was an electrical fault somewhere else. Having previously tried (and failed) to troubleshoot electrical faults on a French van, I gave up all hope of fixing the issue. Instead, I returned the new lock for a full refund (!) and devised a bodge.

I detached the pull cable for the external door release but kept the pull cable for the internal door release attached. This way, the door can be opened from the inside but not the outside. I was wary that the latch might naturally slide into the 'child lock' position (ie: locked from the inside) over time, so I cable tied this bit open (see pic). This way, the door is always unlocked from the inside and always locked from the outside.

Last edited by Isaac_Blanc (2025-07-16 22:20:59)

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#1 2025-05-17 12:02:46

Sliding door lock

#2 2025-05-18 12:37:36

Re: Sliding door lock

#3 2025-05-18 15:20:08

Re: Sliding door lock

#4 2025-05-18 17:21:23

Re: Sliding door lock

#5 2025-05-18 17:44:37

Re: Sliding door lock

#6 2025-06-17 18:26:13

Re: Sliding door lock

#7 2025-06-17 18:44:23

Re: Sliding door lock

#8 2025-07-16 22:20:37

Re: Sliding door lock

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