Yep, it should be pretty apparent where the plugs go, with the exception on a single wire plug that comes from the rain sensor. There are two places where that one can fit. Don't ask me how I found that out.
Now, if you meant that the previous shop pulled the wires out of the connector, that's another story entirely!
If you have access to a schematic diagram, the relay in question is designated N10. Hopefully that will help.
"It's not about how fast you can go, but how well you can go fast."
'97 S320 (LWB), Ruby Red Metallic/Tan, 75k miles
'01 E320, Black/Charcoal, 90k miles
Gone but not forgotten. . .
'97 S420V, Smoke Silver Metallic/Tan, (RIP 22 Oct 2012, 178627 miles) He gave his life to save mine.