Sorry I didn't see this sooner. Next time if you have a question go ahead and post it under the W123 Mercedes device.
[[Topic:Mercedes W123]]
I'll see it there more readily. Thanks.
On to your issue at hand, if you haven't figure it out already, the relay for the power windows on the W123's is behind the instrument cluster. You have to remove the cluster, and may have to push aside some sound deadening material, but it should be back there next to a cluster of ground wires. Here is a guide on how to remove your cluster, hope it helps. If you have any follow up questions feel free to email me, address is in my profile.
[guide|25231]