I'm not sure if the wire is actually there (pin 25) as you didn't have the switch installed at factory.@Pauly I can’t connect to the black BCM plug. It doesn’t give me enough slack to get to the cable. You said plug 25 will already be occupied. Could you tell me the colour of this cable and where it is running to? Maybe I can find a better spot to connect. Thanks in advance for your help.
EDIT: If the wire exists, it can be found at connector T17l (black, 17 pin connector) inside a zipper sleeve by left A-pillar.
Anyways, the wiring diagram - I think you are after switch E150 (page 2/3) - yellow wire -->
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