Abs service light

Unfortunately the first thing that needs to be done is have the computers scanned for codes and write down the exact code numbers not code descriptions and let me know what they are.Most diyer scan tools won't read those ABS and four wheel drive codes/computers. You might even need a professional scan tool capable of reading live ABS data and special functions to help diagnosis and repair the problem. Will have to start by seeing what codes it has first and go from there.