Quick Question about Door Close Assist Vacuum Pump
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Newbie
Joined: Jun 2016
Posts: 7
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1992 S320 (Imported from Canada)
Quick Question about Door Close Assist Vacuum Pump
You know the pump that makes like 20 things work - including the lower back supports that either make or break seat comfort? THAT one lol
Ok, so when I hit the door lock/unlock button back and forth, it clicks, but nothing else.
Same with any other vacuum thing I try to operate - click but no pump action.
Do you agree that it is most likely the pump and I should replace the whole pump unit?
** bonus question if I can sneak it in - what does the vacuum pump in the trunk operate?
Ok, so when I hit the door lock/unlock button back and forth, it clicks, but nothing else.
Same with any other vacuum thing I try to operate - click but no pump action.
Do you agree that it is most likely the pump and I should replace the whole pump unit?
** bonus question if I can sneak it in - what does the vacuum pump in the trunk operate?
Junior Member
Joined: Aug 2004
Posts: 41
Likes: 3
From: Richmond, BC, CA
1990 560 SEL , 1998 S 420
partenr, as per your subject, the vacuum pump in the trunk is responsible for the closing as pulling the doors and trunk shut. No need to slam shut. Hence, Door Close Assist pump.
The other PSE, ( vacuum and pressure pump) inside vehicle under rear seat, right side, is responsible for all the nice things mentioned by Plutoe above.
The other PSE, ( vacuum and pressure pump) inside vehicle under rear seat, right side, is responsible for all the nice things mentioned by Plutoe above.
