Hello
So as the title says, I have encountered an interesting problem with my double lock feature.
I have driven this car for 3 years now, and the previous owner was my father. The reason I mention that, is that he says the problem was present even when he was driving it. So it's been like this it seems for a few years now.
So the issue is, the car ONLY double locks, from the drivers door. The passenger door and trunk can "regular" lock the car fortunately pretty okay.
I have done some light reading on the matter, seems pretty common, but this issue is somewhat weird, as I haven't read anywhere of anyone encountered something like this.
Here are the links of some of the stuff I found that helped me understand how it all works:
This one was actually pretty good, it helped me somehow "rule out" other faults, as I will explain later.
Also this one, was a good read, though I noticed some inconsistencies in there.
In general I just googled bmw e30 double lock, and just read what I could find.
Now on to, what I "think" might be the cause and how I came to the conclusion.
So I've noticed in the past few days, that the locking action felt really off, and felt like something was about to break.
So, I took the lock cylinder out, and sure enough, it was about to fall apart, cracked in 4 places! Luckily I had some old lock cylinders, so I salvaged some parts over, without changing the tumblers and all was good. I hoped fixing this would also solve the double lock problem as well, but it didn't.
So I read some more on the matter, especially that unofficialbmw page really shed some light.
It appears the drivers door lock attaches to this latch, that if you turn the lock 45 degrees apparently pushes down on a latch that goes in the lock assembly and that should push the motor down, and the motor has a LOCK switch inside, that regular locks the car. Then, it you turn the key another 45 degrees, you hit the "lock inhibit" switch, or just the double lock switch.
Now in order to confirm that I cannot lock the car regularly, the test is to disconnect the battery, and then see if I can just lock the drivers door. I did that test, and sure enough, I can't. I even turn the key even more, and I feel the spring turn to the double lock part, but that won't work because I disconnected the battery.
Also another problem I noticed during the test. The theory is that once you double lock, and leave the lock in the 90 degree position, you should not be able to unlock the car in any way: neither from pulling the drivers lock button, nor the passenger side, nor the trunk. But while the car is double locked, if I have the window down, I can pull the drivers lock button!! And open the door!!
So I think it's safe to say, there is a problem between the mechanical connection between the drivers door lock cylinder and the motor.
I'm not sure where to look for a problem in this situation, hence why I'm asking for help here.
Sorry for the long write, just wanted to give the context that I noticed the problem, also to rule out other faults.
Let me know what you think, thank you.
So as the title says, I have encountered an interesting problem with my double lock feature.
I have driven this car for 3 years now, and the previous owner was my father. The reason I mention that, is that he says the problem was present even when he was driving it. So it's been like this it seems for a few years now.
So the issue is, the car ONLY double locks, from the drivers door. The passenger door and trunk can "regular" lock the car fortunately pretty okay.
I have done some light reading on the matter, seems pretty common, but this issue is somewhat weird, as I haven't read anywhere of anyone encountered something like this.
Here are the links of some of the stuff I found that helped me understand how it all works:
This one was actually pretty good, it helped me somehow "rule out" other faults, as I will explain later.
Also this one, was a good read, though I noticed some inconsistencies in there.
In general I just googled bmw e30 double lock, and just read what I could find.
Now on to, what I "think" might be the cause and how I came to the conclusion.
So I've noticed in the past few days, that the locking action felt really off, and felt like something was about to break.
So, I took the lock cylinder out, and sure enough, it was about to fall apart, cracked in 4 places! Luckily I had some old lock cylinders, so I salvaged some parts over, without changing the tumblers and all was good. I hoped fixing this would also solve the double lock problem as well, but it didn't.
So I read some more on the matter, especially that unofficialbmw page really shed some light.
It appears the drivers door lock attaches to this latch, that if you turn the lock 45 degrees apparently pushes down on a latch that goes in the lock assembly and that should push the motor down, and the motor has a LOCK switch inside, that regular locks the car. Then, it you turn the key another 45 degrees, you hit the "lock inhibit" switch, or just the double lock switch.
Now in order to confirm that I cannot lock the car regularly, the test is to disconnect the battery, and then see if I can just lock the drivers door. I did that test, and sure enough, I can't. I even turn the key even more, and I feel the spring turn to the double lock part, but that won't work because I disconnected the battery.
Also another problem I noticed during the test. The theory is that once you double lock, and leave the lock in the 90 degree position, you should not be able to unlock the car in any way: neither from pulling the drivers lock button, nor the passenger side, nor the trunk. But while the car is double locked, if I have the window down, I can pull the drivers lock button!! And open the door!!
So I think it's safe to say, there is a problem between the mechanical connection between the drivers door lock cylinder and the motor.
I'm not sure where to look for a problem in this situation, hence why I'm asking for help here.
Sorry for the long write, just wanted to give the context that I noticed the problem, also to rule out other faults.
Let me know what you think, thank you.
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