I made a post about this in the navagation forum about a month ago no one has replied I cant find the navi unit in my 99 TL. I checked the trunk and under the seats. I want to power on my a/c before summer kicks in. What do I need in order to power my ac? http://tinypic.com/r/35kquxu/6

 

What are you asking?

 

How do I turn my a/c on? My navagation screen is black. On the side of the screen is 5 buttons. I pressed the a/c button & nothing comes on

 

I think you can press auto button on the bottom of the navigation screen and set the desired temperature by using the buttons next to auto. Give it a try and report back!

 

I've done this before and no air comes out the vents

 

If no air out the vents check the blower motor and or fuse.

 

Check your fuses. Maybe it's not just the screen. Maybe the temp control system is broken. I don't have navi so I'm not sure if it works without the screen working too.