Fog Light Wiring Diagram | Toyota Nation Forum 4. You have to buy a Fog light relay from toyota 37 bucks, it is located behind the ash tray right behind the climate control. You plug it right in the empty spot on the right side on the top. 5. Start your car and turn on the headlights and the fog lights will turn on. AIM the fog lights and you are done. How To Wire Fog And Driving Lights Harness Wiring Diagram Harness Wiring. Note: This is a general wiring diagram for automotive applications. Use as reference only. Your lamp kit harness my have different wire colors. Locate the low beam or high beam light lead on one headlamp by using a circuit tester. Use the following procedure: For Fog Lights: Turn on the low HOW TO INSTALL 2007 CAMRY FOG LIGHTS - Fixya HOW TO INSTALL 2007 CAMRY FOG LIGHTS THINKING OF BUYING OEM FOG LIGHTS FOR MY 2007 CAMRY - WOULD LIKE run wires through firewall and tie into fuse block+pos wire goes to at least a 20amp fuse and other side toswitch +pos wire from lights goes to other side of switch -neg wire Wiring diagram to install OEM 2010 Toyota Camry fog lghts.