Review on Axxess GMOS 01 Onstar Harness Adapter by Porfirio Newitt

Fits my car perfectly. I'm only giving 3 stars because the instructions are TERRIBLE! For those who are struggling and don't want to surf the internet like me, here's some (hopefully) helpful info: You need to connect BOTH the red wires on the wiring harness to the red wire on the main unit. The instructions don't mention there are 2 red wires, that's stupid, but I've found a lot of people have this problem. In addition, there will be a lot of extra wires. As this is common across many makes and models, not all wires are used. In my case I have 9 wires left. I just sealed them with tape to make sure the wires didn't come loose, touch metal or whatever. The product is great but they really need to work according to these instructions.