I add an automatic start button, I hardly use it but I was really sick of the cig lighter input, so I re-wired my radar detector and pushed my cig lighter adaptor behind the dash. The button has no purpos really but its a perfect fit and I get a lot of people asking me what it is for. It was simple to install and I got one off of eBay. However, the instructions that came with it were all in Japanese!! >

> So I had to play a game of guess and check! >

> I know that the Yellow wire comming out of the ingition is the ignition, the white is power and I think that the gray with a black strip is the ground. You can just give your local Toyota Parts dealer a call and they can tell you the specifics!!