Have you checked the Central Locking System fuses in the glovebox area AND in the trunk?
What position is your trunk lock cylinder? You have the ability to remove the trunk from the central locking system (secure/valet mode). If you turn and leave it in the horizontal position ( -- ) ...the the trunk is SECURED and can only be opened with the master key's trunk release button or by sticking it manually in the lock cylinder.
If you turn and LEAVE the trunk lock cylinder in he VERTICAL position ( | ) ...then the trunk will lock/unlock with the central locking system and the buttons inside the car (trunk release and central lock/unlock) will work as you think they should (unless something else is WRONG with your central locking system).
This is explained in the owners manual...see the section in the right column in image below under SECURE SEPARATELY:
That info is in your owner's manual. If you don't have one, get one from the dealer.
There are many features that are not obvious, to wit: how to control whether the right side mirror moves down when in reverse; how to shut off the IHKA.
Got a question for you. When you open the trunk by using the handle just below the roundel symbol, do you hear the little electronic sound of the release actuator engaging?
If so, then it may be as simple as a bad switch inside the car. Don't know if this helps or not, but hope so.
actually the handle doesnt even move..if i press it it just doesnt budge...idk if this helps but i dont have the stock alarm system in the car anymore i have an aftermarket system
The handle (or bigass button) doesn't really move. But like BMR_LVR said, if you don't hear a clickwhir type sound when you press it, it's the switch or the fuse for it.
I had the same problem with my 98 528i. Actually ended up being the wiring in the harness that comes out of the trunk in the upper right corner and into the lid. When I pulled the rubber harnessing back, I found the wire had become brittle and snapped over years of movement. During the repair two more of the wires broke so handle with care. Fairly easy DIY.
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