If you have heated seats you need to wire in a resistor for the LED's in those switches as well as the traction control button if you have that as well. I used a 1k ohm resistor inline with a 2 volt Ultrabright 5mm LED that puts out 3000 mcd luminosity. LED's have two leads coming from the botton of a plastic enclosure. Bulbs look like regular light bulbs from a lamp in your house but smaller.
Comment to wife: " Who's side of the car is the steering wheel on? ALRIGHT THEN I'LL CONTINUE TO DRIVE IF THAT'S OKAY WITH YOU!!!"