Another problem with central locking

[sauber]

Hello.
I searched a lot of the forum but couldn't find such a problem. The car is a 1985 European model.
Driver's side central locking everything works properly, unlocking/locking both doors and trunk. The problem is on the passenger door. Only locking all doors works, but not unlocking. The key turns normally in both directions. The attachment shows which part touches the switch when turning the key. This switch then locks the entire car. But I can't figure out which part exactly is supposed to unlock the door. Here comes my problem. Can someone show me in a picture what has to happen for all the doors to unlock? Can I simulate unlocking the door with central locking by hand now that it is possible from the inside?

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[TimU]

Not quite.
That switch senses the overlock (deadlock) function.
The only thing is does is disable the central locking electronics when you turn the key 90° to deadlock.
You'll notice that turning the key 45° to lock will not trigger the switch.

The central locking servo for each door is located at the bottom of the door, attached to the locking arm.

The main central locking control unit is located under the dash, but it can also be triggered from the boot lock.

See here for details.
viewtopic.php?t=33148

Also watch this video for a detailed tear down and rebuild of the door handle and locking mechanism.
https://youtu.be/JqOq75Kf-pw

[sauber]

Thanks TimU.
I was at the car today and a little research. I saw that there is no such switch on the left / driver's side. I was surprised. Am I right that someone removed it for some unknown reason and that's why the central locking doesn't work as it should?
I was looking for BMW ETK. The part number this switch should be 61311375138 and It's different from the right door. All the switches I found have two contacts part number 61311375137 (last attachment). It has three contacts for the left side. How is it possible that I can't find the one I need anywhere? Help would be greatly appreciated.

[TimU]

I saw that there is no such switch on the left / driver's side. I was surprised. Am I right that someone removed it for some unknown reason and that's why the central locking doesn't work as it should?

Yes and No.

Yes, it appears that the Left side deadlock switch may have been removed for some reason.
I have this switch on BOTH doors of my 1986 Australian-delivered car (RHD Euro spec).

No, a missing deadlock switch should NOT cause your Central Locking system to stop working.
It's a Normally Open switch that closes the circuit when the switch is activated, meaning that a missing switch will always be OPEN.

I was looking for BMW ETK. The part number this switch should be 61311375138 and It's different from the right door. All the switches I found have two contacts part number 61311375137 (last attachment). It has three contacts for the left side. How is it possible that I can't find the one I need anywhere? Help would be greatly appreciated.

I just checked my project pics from when I worked on my locks:
(Remember, mine is Right-Hand Drive)
* Right Door (Driver Side) has a 3-pin switch. 61311375138 ONLY APPLIES TO DRIVER'S SIDE
* Left Door (Pass Side) has a 2-pin switch. 61311375137 ONLY APPLIES TO CO-DRIVERS SIDE

Don't forget that you will also need the little silver spring switch lever:
61311368987 Lever Left
61311372660 Lever Right
and the Spring clamp to hold the switch to the bracket:
61131368986 Clamp

https://www.realoem.com/bmw/enUS/showpa ... 1311375138

-----

Having said all that, you don't really *NEED* this switch for the Central Locking system to function.
As I noted earlier, it is ONLY in effect when you turn the lock 90° to deadlock.
Turning the key 45° will lock the car, but will not trigger the switch.
The switch acts as a cut-out, disabling the whole central locking system.

It's an entirely useless switch if you never intend to deadlock the car.

-----

So, back the problem you're trying to solve:

Driver's side central locking everything works properly, unlocking/locking both doors and trunk. The problem is on the passenger door.
[...]
Only locking all doors works, but not unlocking. The key turns normally in both directions, but I can't figure out which part exactly is supposed to unlock the door.
Here comes my problem.
Can someone show me in a picture what has to happen for all the doors to unlock?
Can I simulate unlocking the door with central locking by hand now that it is possible from the inside?

A manual key turn pushes up or down to activate the Central Locking Servo motor at the bottom of each door.
Opening or closing this motor sends a signal to the CL control unit to apply the same action to the other CL motors (Other Door, Fuel Door, Boot)

The main central locking control unit is located under the dash, but it can also be triggered from the boot lock or door locks.
Shorting the LOCK or UNLOCK pin to ground at any of these points should trigger the Central Locking system everywhere.

As per my original reply, see here for details:
viewtopic.php?t=33148

[sauber]

But if the main central locking control was broken then the central locking on the left wouldn't work either or am I wrong?

[sauber]

Today I spent the whole day assembling the car. The doors are still disassembled so I checked everything. I manually turned on and off the red central locking switch at the bottom of the door, checked all the switches, adjusted the door and the mechanism, lubricated... Finally, I check and the central locking and unlocking with the key also works on the right side Don't ask me what was wrong because I don't know. I spent half an hour just unlocking and locking on all the locks and it works great. I was so happy! Let it stay that way.

I also found the switch under the lock for the left side. It was a real adventure to find the right one. Now they are on both sides as they should be.

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[TimU]

Excellent, well done!