Hello,
New here. I just got a used 2015 Yukon SLT and cannot get both the left and right seat haptic motors to come on at all. I did some checking and disconnected both the left and right motors and applied 12V to them and heard each of them go off just fine. However when i go into the intellilink menu, under vehicle settings, there is no option for me to change the alert type from beep to vibrate. Is this a software update of some kind? I can not find any information about this anywhere.