This is a very complicated system but from
the symptoms you describe it sounds like the
PSE pump. Their are to air pumps in this car,
one for (CA)closing assistance "the pump that
sucks the doors shut" and the PSE that locks
the doors.The PSE also works the climate
control as well so if you had a power failure
to the pump climate control would be dead as
well. PSE pump failure is not uncommon but I
would not run out and buy a new pump until
I had the system tested by a qualified tech.