In my (new to me) 126 the door locks haven't worked so I took a look at them today. The 126 has a dedicated pump for the door locks that resides in the trunk. When I pulled it out it was unplugged, so I plugged it in. It ran for about three seconds then blew the fuse. I replaced the fuse, plugged it back in and it ran for about 20 seconds. While it was running I tried the door locks from the drivers door using the key. Nothing happened. By this time the pump had stopped and not blown the fuse. I then unplugged the pump and plugged it back in. In ran for a few seconds and stopped. I tried the key again and now, the locks still don't work but the pump runs for about a half second each time I turn the key. It is my understanding from searches, that this system uses vacuum to lock the locks and pressure to unlock. I plan to pull the vac. line off the pump and draw a vacuum on it with the mity vac and see if it will lock the doors. If it won't I know I have a leak to find. If it does, I think then I need to investigate the switch on the drivers door lock. Does this sound like a good plan? I will need help testing the switch as I have no idea how. I do have a meter and a little knowledge of how to use it. Any input is appreciated.

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Muleears
'07 E320 Bluetec 133K my DD
'04 Jaguar XJ8 VDP, 34K
'10 Hyundai Accent 60K Grocery Getter
'02 VW Golf soon to be on the road again
'97 E300 Diesel Son's DD
'61 VERY tolerant wife

Hampton Roads, VA USA

Gone but not forgotten:
'67 250S 95K
'86 300SDL
'87 300D Turbo, 364K! R.I.P.
'98 E300 Turbodiesel, 213K
'02 S420, 164K
'01 Prius 138K