Originally Posted by cacher33
For the headlights I just plugged in the sensor and the new switch. Worked great. I can't get the temperature to show though.
To add the auto headlamps feature:
I have an 09 XL and got my Parts from www.TascaParts.com
7L1Z13A018A Sentinel sensor, w/o atc 2007 - 2010 $11.39
This is in the center of the top of the dash, to install take a very small flat tip screwdriver and gently lift the rectangle cover (about 1" X 1/2"). It sure was nice of FORD to connect the wire to this "dummy" trim piece. unhook the 2 pin connector =>C287 (aha 2 pins, it is only one sensor, 4 pins is C286 for auto A/C), plug in the new sensor and look at the sensor and the hole, it only goes in one way.
9L3Z11654CA Headlamp switch, f150, w/auto headlamps, w/foglamps 2009 - 2010 $43.55
Remove the panel that is on the left side of the dash (only accessible with the drivers door open), disconnect the connector => C205 from your "old" light switch. You can now feel the detents you have to push in (squeeze) to remove the old light switch, you shouldn't need any tools. Once the old switch is out pull the wire thru and connect to the new switch, line it up correctly and push it in.
Replace the panel, to the left of the dashboard.
reference: 2009 F150 wiring diagrams, pages 85-3 & 151-14
Regarding the Ambient air temperature sensor:
you'll need the sensor, it installs under the hood in the front passenger side of center, the wiring is there (2 pin connector C132), however I believe you'll need to either reprogram your computer or possibly need a different radio display or mirror display => I've looked thru the wiring diagrams and haven't figured this one out yet.