How do you turn off DRL on 2002 trailblazer?

In Canada that is not possible. However in the US It is listed in the manual how to do it. I believe it is a process of turning on the truck then pushing the courtesy light button on and off about 3 times. This has to be done each time you start the truck. If you purchase HID's and need a permanent solution then you can contact a member of our Trailblazer Enthusiast forum (Tblazed) for his electrical solution. www.trailvoy.com