2001 s40 aftermarket keyless entry install

[kiisdead]

Hi everyone I am new to this forum and to Volvos. I just picked up 2001 S40, but it didn't come with factory key fob. Just one of the keys. I picked up on of those ready remote keyless entry systems from pep boys and wondering if anyone has a DIY for the install. I've done one other one on a Toyota and that seemed to be start forward and easy, the Volvo seems a little more confusing with amount of wiring that is flowing through it. I searched couldn't find anything on this model and year but I did see the one for another year model. Any help would be awesome