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Lost but making good time
3er + 3er + 4er = 10er, Bimmers?!
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6,486 Posts
How about a photograph, so we can see the switch that's baffling you? A red arrow pointing to nothing in particular on a page from the owner's manual is a little vague.

The fact that you can't find it in the owner's manual strongly suggests "aftermarket accessory," though. In which case, a definitive answer may not be in the cards.
 
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Lost but making good time
3er + 3er + 4er = 10er, Bimmers?!
Joined
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6,486 Posts
Agreed, that is definitely not BMW's handiwork. That's an interesting installation site, too--someone wanted the switch to be accessible but not readily observed, and put in a fair bit of effort to make it so. Moderately stealthy.

Turn on the headlights, then check whether the switch affects the tail lights. Maybe the previous owner was a smuggler, or wheelman for a heist crew.

Ignition kill switch or similar anti-theft device?

Concealed GPS transmitter for some psychopath to track untrusted offspring/partners?

E90s have two accessory power sockets near the console: One in the armrest compartment and a semi-concealed one in the passenger footwell, under the dashboard to the left of the glovebox. Perhaps a previous had a need to control power to one or both of those, without fiddling with the plugs? (Radar detector leaps to mind again.) This theory is easy to check with a multimeter...let us know if you can't find the footwell outlet.

As F10NZ stated, you might have to open 'er up and trace circuits to get more clues.
 
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