I was driving my 1997 E420 sport yesterday when stereo quit and also found when I parked that the door locks did not lock/interior lights were out (and no multi-contour seat on next start-up.) Checked manual for fuse location and found no fuse assignments in manual, or on cover of fuse block, or anywhere for that matter (BTW, would it kill MB to give us this info?) Had to call IT for fuse location (under back seat) and number (5).

Replaced 25 amp fuse and stereo/interior lights OK but no locks/multi-contour. I understand the PSE (?) pump generates vacuum for the door locks, but does it also generate pressure for the multi-contour seats?

If the pump blew the fuse once, shouldn't it keep blowing it? Is there a seperate module that tells the pump to run - and if so, where is that one? Does the pump (or control module) need to be reset like the one in my 1995 S320? I checked a bunch of posts but could not find anything on this (for the W210.)

I did put a multi-meter on what appeared to be the power supply (largest wires) to the pump and it had good voltage between the black wire and two (2) other wires (red w/green stripe I think.)

Just in case, any cost estimates on a new pump? Is there a core charge or can I tear into mine to check for anything obvious?