thanks again...
but what does ac, + natural plug mean? and how do you know its the right pin?
the discription reads
07 suburban
Speed Sense yellow/black ac ECM, black 73 pin plug, pin 57
The ECM (Engine Control Module) is on the driver side fender, behind the headlight.
Reverse Light dk. blue + BCM, natural plug, pin 22
The BCM (Body Control Module) is to the left of the steering column.