You have an RTL-T? I believe this is in the customization area that you access through the 8 inch entertainment display. I understand you're looking for steps that use switches and dials on the dashboard, but I believe that you have a more direct route through the touchscreen that I'm pretty sure you have. It it's too late here for me to pad out to the truck and figure out the exact steps for you. I'm guessing somebody else will have helped you by the time I get back to this thread tomorrow.