Hi, just a heads up. The door chimes, headlights on warning sound (when the car is turned off), and the dome lights are all controlled by the oem head unit. One you remove the oem head unit, you will lose these features, unless you buy an expensive module (
http://www.bestbuy.com/site/Scosche...85&skuId=9084466&st=pontiac sunfire&cp=1&lp=4).
I've changed my head unit to an after market deck, and didn't want to pay $100 on this addition thing so I ended up losing the above mentioned features.
Just thought I'd let you know