try pumping air into the seat control module manually to see if the bags inflate.
then if it does, does it leak? if it does, then I would guess that the control
module or seat lines (or bag) has a leak.....as you've eliminated the PSE pump
from the system.

you can use one of those drug store rubber baby snot bulb thingies.

you can also continue...systematically...try to introduce air along different
junctions along the air line as anywhere there is a fitting is a natural weak spot
for failure.

yes, PSE pump handles air supply to the door locks and seats, trunk lock, rear
headrests....

__________________
-- raymond~
47º 34'N 122º 18'W