My 97 P38 just started cranking over in the driveway with no one in it nor any key nearby. I removed relay 16 and it stopped. I tried a different relay and it immediately started cranking again. With the relay removed, I inserted the key and cycled it to start a couple of times, put the relay back in and it seems to be back to normal.
There’s not much to this system per the wiring diagram, relay to BeCM to ignition switch to ground. It’s hard to imagine a switch failing closed, but maybe it’s possible(?). I suppose the relay could be finding another ground somewhere in the wiring, but then why would cycling the switch cure it? And I really hope the BeCM isn’t finding a ground internally.
Have any of you experienced this before or have any other ideas?