If you own a 2003, you might be interested to know this. http://www.alldatadiy.com has a free demo which allows you to use their site to get factory manuals for reference. One of the Demo vehicles is a 2003 Pontiac Bonneville VIN 'K'. It shows you all the diagrams and you can search through it. I'd recommend saving the portions you need incase it changes. It is only $21/yr for one car and $15/yr for additional.