Mercedes C220 Door Lock Vacum Pump, is my newest problem. I took my friends C230 pump to see if my wiring was fine, and the pump had different wiring, however it connected except my car wouldn't start, but it proved my wiring was fine. I was wondering if anyone else has had there door lock vacum pump fail on them? and wheather its caused driving problems for them...that's not a typo. My car's auto theft kicks in sometimes, and I can't start it. I have to lock all the doors with my key, wait a couple seconds, open driver door, and she starts. I'm surprised mercedes would link the pump with anti theft knowing its a part that might need repairs in the future. I was wondering if anyone knows anything about these vacum pumps? Has anyone worked on these pumps before or know how to fix them?

I've taken my air pump apart already, and noticed the board inside and everything. Nothing smells bad, and no signs point to circuit board burnage. I'm afriad to work on this pump however, since I'm unsure if I mess anything up, my car might never start again until i get a new pump, which mercedes canada quoted me in excess of 1200 dollars. I can't seem to find any used ones either. If anyone knows of any common problems or quick fixes for these door lock pumps, please let me know. Thanks.