Hi. I'm a long time BMW CCA member (currently have a 2002 M3 Coupe) but new to using the Forum. I am right now dealing with a 1991 850i that has (temporarily) come into my care at www.m37auction.com (a consignment auction business near Grand Rapids, MI) where the car will be in our next auction at a very reasonable reserve. The battery had gotten low so I took it out to recharge it (being careful not to latch the trunk lid) and when I reinstalled it I noted that the owner had installed one of those green knob cut off switches so I decided since the car is sitting so long that I'd keep the knob in the off position, closed the trunk, opened it with the key (as described in the manual) so thinking all would be fine I again closed the trunk. Dumb! Key now won't open it and with the battery disconnected no way to attach a charger or jump battery to the terminals under the hood. I'm thinking that a possible to solve this is to pull the back seat out and hope that will provide a way to reach in and turn the green knob to the on position.