IIRC that's a Pioneer number. The newest Pioneers want you to stop, park, apply the ebrake. If you are parked, with the ebrake on when you turn the car on, you have to remove the brake and reapply. The head unit has a circuit built in that detects the ground as it's turned on and dismisses it as a bypass to the system.

I'm unclear why you want the PNP switch though, the brake doesn't go through it to my knowledge.