Drive Authorization System. I believe that K40 problems can trigger this by not supplying power to the computer, while the RCL has power. When the RCL tries to verify the computer in the car, it gets no response.

DAS will also lock out the car if you lock from the outside and unlock from the inside. When this happens, the starter motor will function but no fuel will be injected, along with alternating lamps on the interior mirror. I don't know how the later cars (which lack these lamps) tell you that DAS is locking you out.