Central Locking Defect - T2 TDI

[TONUP]

My Terrano has developed a fault recently with the central locking.

The car can still be unlocked from the key-fob 'plipper'.

It can also be relocked, but only if the passenger front door is manually locked first. If you try to lock the doors without manually locking the front passenger door first, none of the other doors will lock. In fact you get a kind bouncing effect on all of the other door locks, which all fail to lock.

Has anyone experienced an issue similar to this before, and any advice on where to start looking would be greatly appreciated.

Regards

Alan

 

[Lazy-Ferret]

Not had it on the T2, but almost the same on the T1 when we got it.

In the actual door lock mechanism, is a switch, that lets the central locking know what position everything is in, when you turn the key, or operate the lock button in the car.

The Key part should return to a central Open position, e.g. when you turn the key to lock, and then recentre the key, it should momentarily connect the lock contacts together, then return to the open setting in the middle with the key. Then when you unlock, the same thing.

I would imagine it is somehow staying in the unlock position, when the key is in the centre position. It may just be one of the wire links has jumped off inside the door, or even one of the wires trapped, but you are best off starting in the drivers door.

 

[TONUP]

Not had it on the T2, but almost the same on the T1 when we got it.

In the actual door lock mechanism, is a switch, that lets the central locking know what position everything is in, when you turn the key, or operate the lock button in the car.

The Key part should return to a central Open position, e.g. when you turn the key to lock, and then recentre the key, it should momentarily connect the lock contacts together, then return to the open setting in the middle with the key. Then when you unlock, the same thing.

I would imagine it is somehow staying in the unlock position, when the key is in the centre position. It may just be one of the wire links has jumped off inside the door, or even one of the wires trapped, but you are best off starting in the drivers door.

Thank you for the very quick reply. I will take the door card of the drivers door first, as suggested, and have a (careful) root around for anything that might be amiss.

I have to admit I wouldn't of started looking on that side, so you may have saved me a lot of time. This is the first car I have ever owned with just one door lock, which is in the drivers door.

Regards

Alan

 

[Banshee]

Someone else has had this very recently, have a quick search, I'm not sure if they resolved it but I know when I had something like this it was the passengers door mechanism needed removing, jiggling and greasing

 

[Lazy-Ferret]

Thank you for the very quick reply. I will take the door card of the drivers door first, as suggested, and have a (careful) root around for anything that might be amiss.

I have to admit I wouldn't of started looking on that side, so you may have saved me a lot of time. This is the first car I have ever owned with just one door lock, which is in the drivers door.

Regards

Alan

Sorry Alan, I misread your post, somehow. In my mind, I was reading it as drivers door, as I know there is no lock on the passenger door, but I have just realised, you mean locking it using the button inside the door, not the key lock.

So Sorry..

Same principle though, but on the passenger side, the switch is not returning to open, until you lock the door.

There is a schematic in the workshop manual, page 139 in the EL section
http://bebrs.pie-dabas.net/Webs/Terrano/R20/el.pdf

 

[TONUP]

Someone else has had this very recently, have a quick search, I'm not sure if they resolved it but I know when I had something like this it was the passengers door mechanism needed removing, jiggling and greasing

Thanks for the feedback. I'll take a look through the sites search function. I hope it is as simple as a bit of jiggling (that word always makes me think of Arkwright ) and greasing.

Regards

Alan

 

[TONUP]

Sorry Alan, I misread your post, somehow. In my mind, I was reading it as drivers door, as I know there is no lock on the passenger door, but I have just realised, you mean locking it using the button inside the door, not the key lock.

So Sorry..

Same principle though, but on the passenger side, the switch is not returning to open, until you lock the door.

There is a schematic in the workshop manual, page 139 in the EL section
http://bebrs.pie-dabas.net/Webs/Terrano/R20/el.pdf

No problem mate, I'm hoping to have a look at it on the weekend, so I hadn't pulled anything apart yet. I appreciate your coming back to me though.

Regards

Alan

 

[TONUP]

As planned I have been out to the car this morning, and removed the door card and vapour barrier to expose the internal workings of the door.

I couldn't detect any obvious defects with the wiring I.e bared or pinched wires etc, and the mechanical parts such as the link rods from the inside and outside door openers seemed to be in good order, although I did give them a very quick spray of WD40 on all the pivot points for good measure.

I also used some electrical contact cleaner on the multi plug going into the 'grey coloured' lock actuator mechanism.

Strangely enough I got the passenger lock working properly (albeit intermittently) for a while both on the key fob 'plipper' and through using the key in the drivers door lock.

I have paused any further disassembly to see if I can get some advice from the forum on what I might do next. I am thinking that it could be a defect with either the drivers, or passenger door actuator, but it's difficult to determine which?

Removing the actuator would appear to necessitate the removal of the three external screws around the lock on the edge of the door (see image below)...

And could any members identify what the small black box on the drivers side is, as I think this May have something to do with the security system/door locking system. When I unplugged it all of the doors locked immediately, so it was lucky I had the windows down and key in my pocket! (see image of it just above the largest opening in the door below)...

Any help or advice gratefully received

Regards

Alan

 

[TONUP]

Just giving this a bump to see if any members can help?

Regards

Alan

 

[Lazy-Ferret]

Only thing I can see in the workshop Manual, is a relay... try holding it, while locking and unlocking the door, and see if you can feel it click as you do it..

 

[TONUP]

Only thing I can see in the workshop Manual, is a relay... try holding it, while locking and unlocking the door, and see if you can feel it click as you do it..

Thanks for the reply. I have been messing about with it for the best part of today, and not achieved a lot really. I am going to raise the white flag on this one, and put it all back together tomorrow.

I have a feeling the door lock actuator unit is on the fritz, so I will try to get a second hand replacement at some point when funds allow.

If it's of any interest to anyone, I stripped the actuator apart today and oiled it up. Usual problem with this type of part though, it fell apart once I split the plastic case. I don't think it a serviceable component really?

Picture of internals below...



Regards

Alan

 

[Lazy-Ferret]

That is totally different to the one in the T1.

I must admit, even though electrics is my game, the Central locking circuit is very hard to work out what is going on.

 

[solarman216]

The black box on the drivers door in the pic is the drivers window auto regulator, the part you need is probably the front passenger door lock mechanism, I have one if you want, unless it is a wiring problem to this door, Rick

 

[TONUP]

That is totally different to the one in the T1.

I must admit, even though electrics is my game, the Central locking circuit is very hard to work out what is going on.

I think the constant revision of models and components is cunning plan on the manufacturers part to confound the DIY mechanic.

I feel a little bit better hearing that these systems are complicated for someone well versed in auto electrics.

I appreciate the feedback though.

Regards

Alan

 

[TONUP]

The black box on the drivers door in the pic is the drivers window auto regulator, the part you need is probably the front passenger door lock mechanism, I have one if you want, unless it is a wiring problem to this door, Rick

That's very good of you to let me know, what the mystery box is, and I would be very interested in buying the lock mechanism, assuming it is the same as the 'gubbins' in the picture.

At your convenience, I would be grateful if you could confirm the cost including postage to Gloucestershire?

I'll PM you my address if that's acceptable?

Regards

Alan