W124 Central Locking troubles

[220te]

Hi all, I am wondering if anyone can offer me some advice. I have replaced the pump in my central locking unit as it was burnt out, I have orthopedic seats so I couldn't get the correct unit at a sensible price(part no 124 800 10 48) . I have also re-soldered the board and now have a working pump. The issue is that the pump on first trial ran and pressured up, then when I went to unlock the doors the pump began to run backwards and forwards repeatedly without stopping. Is this likely to be an issue with the black valves at the pump outlet (the ones with the little metal strip connectors), or a faulty door switch. I haven't checked for vacuum leaks as I would imagine that the pump would run one way only if I had a leak. Also the pump didn't seem to time out so I have removed the connectors as I guess this is why the old pump burned out. Unfortunately the car is newly acquired and was a dealer trade in so I am unaware of how the system was operating/failing prior to my purchase.
Any help from the usual W124 suspects (you know who you are ;-) ) would be much appreciated. Someone must have come across this issue before........and yes I did check google and found nothing useful :-(

Thanks in advance 220te

[220te]

Thread bump. The pump wasn't running in reverse but the little black valves are broken which I can't seem to fix. I am now on the lookout for a central locking unit 124 800 10 48 from a W124 or a W126 300 SEL. If anyone has one or has any ideas on a replacement or fix let me know. I want my central locking and seat to work :-(

[r129sl]

The German SPOB has some which it claims are analogous. €250, I think. The listing mentioned ortho seats. Seems they were used on the 201 as well. Sorry I am no more help.

[220te]

Thanks r129sl, I'll have a look.

[r129sl]

This was the link: http://www.german-spob.de/start.php?name=CONTROL-U...

They're good SPOB.

You could also try Chris at Mercman (best to phone) or Dronsfields (ditto). Both are reliable suppliers of used parts and have vast ranges.

[ras62]

It could be the micro switches inside the pump unit are not set correctly. These switches stop the motor in one direction or the other. With the lid off the unit you can see if they are being operated...a little awkward but possible.

[V12 AMG]

0008000748
1248000248
1248001048
1248002648

From oldest to newest part number. All the same part and all compatible with your car.
Chris at Mercman has only 2 currently in stock.

[220te]

Thanks V12AMG, I'll give Chris a ring.

[220te]

Thanks V12AMG, Out of many,many,many pumps he had only 1 of these on the shelf. Job jobbed :-) .I can now move on to finding the numerous leaks and shagged seat bladders (if there are any ha ha).

[220te]

As we all like a happy ending.....pump arrived today.Plugged it in, and I now have working central locking and working ortho seats. Fantastic.
Thanks all