Internal boot release button retrofit

S

SSF

Member
I understand the missing internal boot release button is a "feature" of all European E89s, and I'd like to correct this. Can anyone tell me the (at least approximate) procedure? I have the place for the button (a nice depression where it shoud be, probably covered by a cap), so I guess I need the button itself (61319200316, if I understand correctly) and maybe some wiring (or is it already there)? Is the wiring somethig I shoud buy, or is it something simple I can make by myself? Is it difficult to wire, like a DIY job? I'm not experienced at fiddling with cars, but maybe this part is not more compicated than computers, which I have assembled and repaired a lot of?

Thanks in advance!
 
This is an interesting one.
Is it an electronic release or mechanical (i.e. Pull to release).
A mechanical release would make more sense in case of emergency.

It's something that I've been thinking about as well.
 
Here is the wiring diagram for the boot release button...
 

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Looks like it can be done easily enough

https://z4-forum.com/forum/viewtopic.php?p=1432953#p1432953
 
Switch part number appears correct
https://z4-forum.com/forum/viewtopic.php?p=1813224&hilit=internal+boot+release#p1813224
 
I assume this doesn't get around the problem of a failed normal boot release mechanism in any way?
 
AnubisZed said:
B21 said:
I assume this doesn't get around the problem of a failed normal boot release mechanism in any way?
Click to expand...
No it doesn't
Click to expand...

Ah well..just need to make sure I have you and Robbi on speed dial! :thumbsup: :rofl:
 
Well if you do my mod, you can open the boot with roof in any position. You could fit a switch in that blank to do the job.
https://z4-forum.com/forum/viewtopic.php?t=136430
 
SSF said:
I understand the missing internal boot release button is a "feature" of all European E89s, and I'd like to correct this.
Click to expand...
AFAIK it is not. Even my full equipped German E89 lacks of this button.
And I've stopped retrofitting it years ago when I realized, that even the driver seat has to be taken out of the car to get access to the internal ground connector below a styrol plate on the floor.
 
B21 said:
I assume this doesn't get around the problem of a failed normal boot release mechanism in any way?
Click to expand...
It's a bit different.
Yes, the central(!) locking motor will be started by connecting pin12 to +12V. This is always sufficient to open the trunk lid, even if the roof stucks in any position.

But(1), this motor has to be technically ok and connected to the wiring loom.

But(2), till now I've never seen or heard of a non-working central motor. From my experience, the pin12 method is always sufficient, no additional wire/cable is required on the boot locking system. It takes only a max. of 3 minutes to get access to pin12 with the help of a simple screwdriver.
 
RobbiZ4 said:
B21 said:
I assume this doesn't get around the problem of a failed normal boot release mechanism in any way?
Click to expand...
It's a bit different.
Yes, the central(!) locking motor will be started by connecting pin12 to +12V. This is always sufficient to open the trunk lid, even if the roof stucks in any position.

But(1), this motor has to be technically ok and connected to the wiring loom.

But(2), till now I've never seen or heard of a non-working central motor. From my experience, the pin12 method is always sufficient, no additional wire/cable is required on the boot locking system. It takes only a max. of 3 minutes to get access to pin12 with the help of a simple screwdriver.
Click to expand...

Splendid..thanks for the clarification and expansion.. :thumbsup:
 
This weekend I've tested to release a locked boot lid on a real roof issue with the original ISTA+ software.

Situation:
Roof perfectly closed, not touched on this day, but one of the boot lid switches sent a wrong "open" status, the other switch sent a correct "locked" status. The internal led flashed in red, the windows could not be closed, the boot could not be opened.

ISTA+
There is a service function on the CTM module to lock and unlock the "softclose" mechanism. These actors (motors) on both sides of the trunk locking system turned to open or close. So far so good....

But - this doesn't open the trunk lid, only the softclose locking. That's a big difference!

There is a 3rd motor in the middle of the rear locking system, that has to pull the two wires to unlock the latches. That is the fuctionality, where you guys placed the unlocking hack behind the BMW emblem.

I was not able to execute the ABL (i.e. "Ablauf", like "process") function to drive this 3rd actor. Neither in the CTM module, nor in the JBE (junction box) module. This ABL fuction was greyed out due to the real failure situation. No way to get into the trunk in this faulty situation with ISTA+.

At least, I once again solved it with the pin12 method. :wink:

Does anybody of you guys know another option/function in ISTA to open the trunk lid?


In the next days I will try it once again on my own Z4, currently without any roof fault. Will come back soon...



Update
How it works internally:
https://z4-forum.com/forum/viewtopic.php?p=1967743#p1967743
 
RobbiZ4 said:
In the next days I will try it once again on my own Z4, currently without any roof fault. Will come back soon...
Click to expand...
Well,
today I've tested with INPA on my Z4. I was able to open the boot lid on the following path:

Launch INPA - Select E89 - Body - Junction Box Passenger JBBF - "F6 Ansteuern" (Control) - "F6 Heckklappe öffnen" (open trunk lid)

Important is, that the ignition is switched on. Maybe that it was off when I tried it on the Z4 with the roof issue.

My INPA doesn't contain all translations into English. Therefore I've noted the German functions and translated it by myself.
 
RobbiZ4 said:
RobbiZ4 said:
In the next days I will try it once again on my own Z4, currently without any roof fault. Will come back soon...
Click to expand...
Well,
today I've tested with INPA on my Z4. I was able to open the boot lid on the following path:

Launch INPA - Select E89 - Body - Junction Box Passenger JBBF - "F6 Ansteuern" (Control) - "F6 Heckklappe öffnen" (open trunk lid)

Important is, that the ignition is switched on. Maybe that it was off when I tried it on the Z4 with the roof issue.

My INPA doesn't contain all translations into English. Therefore I've noted the German functions and translated it by myself.
Click to expand...


Good to know..result!

I may just try it over the winter when I dig the laptop out…. :thumbsup:
 
I have confirmed that it can be done with ProTool. Listed under "Interior" then Junction Box (JBBF), then "Control" and finally "Unlock Tailgate"

The question remains can it be done with an active error??? I'm assuming it can, since the infamous Diagnose Dan did it with whatever scan tool he used.
 
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