check air bag system message stays on. Ive changed the module and its still on

Yes, no deployment a minor accident, we rear ended a vehicle, and ever since then the message stays on we had the codes read at a shop and they said it was the SRS unit so we replaced it, took it to get recalibrate and programmed etc. And nothing works

last thought , where did the SRS control module come from? Used , or aftermarket?