Recently w/o warning , I was making a turn when the wheels locked up and the svc 4wd light came on and it seemed to me that the car was fighting to go between 4wd and awd - It is currently in the shop for the last 3 days and the first 2 w/o any diagnosis then a call saying it was the body control module - can anyone shed any light on my perceived fishing expedition- what is a bcm and does it have anything to do w/ the 4wd sytem and will a new one fix the prob.-Thanks !!