Central locking won't work and lost all interior lighting
Senior Member
Joined: Mar 2008
Posts: 8,506
Likes: 1,137
From: St Louis MO
Re: Central locking won't work and lost all interior lighting
The central locking pump is one of those overengineered but cheaply built components Mercedes is known for. It lies in a sump in the bottom of the boot and if there are any leaks it fills with water and fails.
If the pump fails your locks don't work and your security system goes bananas. Park lamps may go on and stay on. Interior lights may not work.
Easy repair and you can find them on E-bay for about $250 most of the time.
I sealed mine up in aplastic bag and pulled the black rubber stopper out of the sump. No more issues.
If the pump fails your locks don't work and your security system goes bananas. Park lamps may go on and stay on. Interior lights may not work.
Easy repair and you can find them on E-bay for about $250 most of the time.
I sealed mine up in aplastic bag and pulled the black rubber stopper out of the sump. No more issues.
Senior Member
Joined: Jul 2009
Posts: 6,358
Likes: 794
From: Central South Carolina
Re: Central locking won't work and lost all interior lighting
IF it hasn't been submerged in water yet (or the other module there as well), poke a hole in both of those rubber (factory) plugs rearward of the axle/diff where a "trunk" would be. That lower cavity below the rug under the Styrofoam is one of the most often happenings with flooding when a leak starts. Poking a hole in them rubber plugs drains any water before it gets high enough to soak the electronics/pneumatics located there. Good luck! .
