grab your owners manual and see what it has listed in the install section. if it is just the e-brake then it will show 1 wire, it may be in the main harness for the unit or it may be in a small sub harness. the wire for your car will be near the e-brake. If you can post up the right model number ( since you said you weren't sure if it was right) I may be able to tell you which way it is. if you do need a bypass I highly recommend the pac tr-7, the ebay listing may not mention all available models. I have an alpine iva-d310 and the guy on ebay said it wouldn't work ( but he had a more expensive one that would) I went to the pac website and contacted them, they said it would, and it did. I did the entire hookup myself and it works flawlessly.