B-Pillar Open/Close Switch
WARNING: This page is about a different car, the 2004 Mercury Monterey and 2004 Ford Freestar. However, it is still accessible from the selected car via links, so may be relevant.
Pressing the B-pillar switch supplies a momentary ground signal to the corresponding PSD. Upon receiving the input, the PSD checks the overhead console on/off switch circuit for ground. If the circuit is at ground, the PSD will open or close the power sliding door, if conditions are correct. If the on/off circuit is not at ground, the PSD will ignore the input.