DavidCA

The "adjustable dual-contact switch" is ONLY for the pressure supply to the seats (MKL) for the lumbar support / massage function,
It is not relevant to any other function.

SquirreL500AMG

MikeJ65 nice post, I gonna try that and troubleshoot. I went in and supplied 12v to all solenoids and they click and I can push air through them. My problem is almost like the manifold is plugged internally somewhere not allowing air to the Trunk port (HECK). That is correct about the MKL port it fills up a gray bottle/plastic box in trunk just FWD of spare which is like a reservoir for the seats. Also, Bill'sMB check the nipple on the pump it's possible it could be cracked.