Interesting, could you please provide the link for this trick. The picture shows more than one plug on the VMS so would be nice to know which to pull.
Will this trick or do you know another trick to power the car from the 12 volts battery when the service disconnect is unplugged (which means that the main battery is shut down)?
This is the story: I have been stupid and pulled the orange service disconnect plug to disconnect the main battery. I put the plug in the trunk and closed the trunk.
Now my key won't physically open the trunk (I put in the key hole but it will not turn) and the car is completely shut down so I cannot use the button on my key to open the trunk either.
The easiest solution to this would be if I could power the car from the 12 volts battery to recognize when I push my key button to open the trunk.
Let me think about that and have a look at some diagrams. Get back to you in a bit.
Looking at the diagrams, for the 2010 LHD and RHD, at the VMS there should be two wires for the trunk latch, a RED (FHC48, pin 8) and a GREEN w/ red strip (FHC48, pin 23). FHC48 is the blue connector at the VMS. If I understand the diagram right these should actuate the trunk release. I suspect if you grab a decent 12V battery (spare, jump pack, something like that) and power the latch directly the trunk will open. Possibly. Or I've read the diagram wrong and something bad will happen, I don't think that's the case, but that's the risk you take when you ask for advice on the internet.
The connector is an one of
these which should aid in identifying the correct pins numbers.
I'd probably toss a multi meter accross the pins and check the resistance. I'd expect to see at least a few hundred K ohm... but maybe not quite that much? If I get motivated, I can go probe mine.
The trunk release works by using a motor/actuator to pull a cable, with releases the latches. There is also a manual pull for the cable inside the trunk (in case someone gets trapped in there) -- that doesn't do you a lot of good. However, you may be able to get to the trunk release cable from under the car. The manuals talk about it being in the vicinity of the left hand-side tail light.