Where does this plain White wire go to? If it's to the second slingshot switch, that could be the problem. The dead lug serves to connect the Row wire(s) (White, with trace) and the plain end of the diode. The additional switch connects in parallel to the first, with jumper wires. But not to the Row connection, unless the second switch has its own diode.
The wiring practice I recall is;
- Row wire(s) to dead lug, with plain end of diode
- Banded end of diode to the handier of the other lugs (one of the actual 'blades'). If there's another switch, as with a slingshot, also a jumper wire to the second switch
- Column wire(s) to the other lug/blade. Again with a jumper wire to any second switch.
So, if this suspect wire is for the other switch, move it to the banded end of the diode.
Looking at the switch chart for Getaway, the slingshots switches are both on column 3, they're 3,1 and 3,2. What you may have here is a 'rectangle' phenomenon, caused by a diode being shorted out. Column 2,1 is the slam tilt, with 2,2 being 'Door Closed'. A diode fault on 3,2 could indeed cause a phantom Slam Tilt, provided the door was closed. It's known as a rectangle problem due to the culprit being diagonally opposite the 'phantom', once the other corners are known.
And only showing when the other three corners are closed.