the locksmith picked the lock to the open position on the boot and it still would not open.
so getting a key blade will not work and the cost off a new key is a lot of money in my part of the world
thanks for the help.
So the car doors are still locked, just the trunk lock is supposed to be open?
Was the locksmith not able to open the door? Does the car have an alarm, perhaps ok to fire the alarm if you just get he key but I'm still not sure if the car's CAN-bus devices wake up when the door is opened if locks have not been opened from the remote (to allow the trunk being opened from the door switch)? Anyone ever tried (I could leave my door window open, lock the car and let the car go to sleep but it takes some time to test this)?
If doors are locked, it is obvious that the car has been designed in a way that it is not easy to access the wires that allow opening the trunk. Further more, the system works through a CAN-bus, the trunk switch is not wired to the trunk but to the door control unit that talks to the rear SAM via CAN. And as mentioned, it is not possible to access the rear SAM before the trunk is open.
An update. I tried with my W221 the following: I opened the front door window, locked the car and left it for a while to allow control unites enter sleep mode. Then I opened the door through the open window from the door handle, I could hear some devices activate but I was not able to open the trunk lid from the button at the door. Only once I had opened the locks with the remote, I was able to open the trunk from the door button.
Probably inserting the key to ignition slot would have activated the door button, I did not try but it would not help here either.
I wonder if road side assistance people could help, e.g. with star but ordering a new key (blade) sounds the least expensive option.