blehrke4100

This is my first time using but my friend installed fog lights on my car and when he wired it he blew the airbag control unit so my airbag light stays on and wont turn off. the dealership wants $900 to fix it but noway am i doing that. I just dont understand the steps to remove and replace it and if it needs to be reprogrammed and what part i can look for on ebay to make this alittle bit cheaper. 2012 nissan maxima. i know it is located under the center console but need to know how to proceed. thanks guys