The pnuematic system pump (PSE computer) has 5-6 different "jobs". Including door locks, back-up assist, headrest fold-down, ortho-seats, retractable trunk handle, & manifold vacuum assist.
Operation of power seats is done by a computer under EACH front seat!

__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator