If the high mount brake light is working, it could be a fault with the multi-function switch.
If the high mount break light is not working, at brake switch check for battery voltage at the Light Green/Red wire. If battery voltag is available, depress the brake pedal and test the Dark Green wire for battery voltage. If voltage is available, test the voltage at fuse # 39 (10 A) in junction box at left side of dash. If fuse is ok, test the Light Green wire to multifunction switch for battery voltage when brake pedal is depressed.
Sunday, October 28th, 2012 AT 9:32 AM