850 admittedly, but changed my alarm control relay a couple of days ago and like the OP all I had was a remote and the rely. Plug and play with zero issues in terms of central locking or alarm/immobiliser system. Can't get my old remote to code to the new relay though, but the one I bought works fine.
As others have said, by the drivers right knee under the steering column. 3x T25s to remove the panel in the case of the 850.
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1995 Volvo 850 T5 Estate (Manual)
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