Trunk lock on 2009 BMW Z4 Keeps engaging

[Biddyyhz]

Hey Folks,
I have a 2009 BMW Z4 and the trunk keeps trying to close after i close the trunk. The actuator keeps Cycling the trunk latch and just constantly recycles after I locked the vehicle...
Can anyone point me in the right direction for the repair?
Bill

 

[B21]

The cables that connect the actuator to the rest of the car are probably broken…search this forum for broken boot lock

 

[Biddyyhz]

Thanks you I will start breaking it down

 

[Biddyyhz]

Ok i have checked all wiring by pulling out the mechanism nothing broken or bent any other ideas?

 

[Biddyyhz]

Ok i have checked all wiring by pulling out the mechanism nothing broken or bent any other ideas?

 

[Gilmour@72]

I am having the same problem, and I can’t find any broken wires. Last time I checked the actuator to look at the wires the boot would close but the soft close wouldn’t engage. After I reassembled everything, now the boot doesn’t close or soft close. Any suggestions?

 

[flybobbie]

Broken wires hide under any sheathing, it's a manufacturing fault.

 

[matsmith749]

Yep - it's broken wiring, you just haven't found it yet.

 

[Gilmour@72]

Thanks guys. I will give it one more try. By the way, I was having trouble detaching the wiring connectors from the actuator so I gave up. Is there some trick to it? Here is a picture.

 

[matsmith749]

The connectors are standard automotive connectors - may need a small screwdriver or a squeeze depending on the type.

Regards the wiring - in the boot it is usually damaged somewhere that it bends along the run. If you expose the wires from the wrapping, it will be obvious & you will find somewhere with insulation that has worn away & exposed the inner cable, or an actual break (less likely).

With it all wrapped up, you will struggle to find it.

The good news is that the damaged area is usually pretty easily accessible & a simple fix once found.

 

[flybobbie]

Breaks next to the plastic housing on the switch.
Every cars switch will break same place due to makers making a cut in the insulation in the wrong place.
Red line in picture under the black sheath.

 

[flybobbie]

I guess the wire maker put in the wrong trim cut, now all cars have weak wires, unless later cars the mistake was spotted and corrected.

 

[flybobbie]

Funny about broken wires, friends Tesla seems to have the same wire as our Zed roofs.
Breaking in the connector bellow to door, in his case stopping rear door opening.

 

[flybobbie]

No definitely a wire cut, as discussed years ago.
I have used such a machine and seen the same mistakes.
I think someone measured to the plastic housing, got it wrong and moved the cut to the switch, for soldering.

 

[flybobbie]

I guess the contract for the E89 wires the tool was set wrong.
Still BMW should have called back, but guess what..

 

[RobbiZ4]

I've dropped my comments.

 

[flybobbie]

Machine i used i reinstated as no one could get it to work properly.
Needed some fiddling and experimenting.
Various cuts can be programmed in.
Set the machine off you have a wire cut every 2 seconds.
That can be a lot of ruined wires!

 

[flybobbie]

But, as said, the same wear can be found on the 3-series as well as4-serieas, produced until 2018.

Do you really think, one single tool was responsible for 100 thousands of wrong configured locking systems, produced over more than one decade?

Well just poor quality control.
BMW scrapped thousands of Mini engines, things happen.

 

[flybobbie]

Machine we had travelled the other way.

Getting pressure on rollers was a pain.

 

[flybobbie]

Could be 14,000 wires cut in a day, just over a weeks work for 120k cars.