Originally Posted by 98CoupeV6
I can almost guarentee it has something to do with that. I don't have my service manual so I don't know what they have in common electrically. I would try to take it back to the shop. Did you check if it shares a relay under the dash or in the underhood fuse box?
She installed it herself, and she used an aftermarket harness, so it's plug and play. If it shares a relay, I haven't found it. I don't have a manual.