Today, looked at said switch, and am reserving a place in hell for the idiot who designed the whole handle thing.
Stripped handle down, and put it all back together again, as gonna need entire passive entry module for that handle. Although buggered if I can get the screw back in the trim piece to secure it. Flattened the battery in the process - well, flattened it enough to get the message on the dash to start the engine.