I have an '06 Uplander and had a factory remote starter put in my vehicle about a year after I bought the van. I had the dealership install the unit and would recommend that others considering adding the GM factory remote do the same as it's not as easy as it sounds. There are a lot of chances for something to go wrong during the installation, and if you attempt to do it yourself and it doesn't work properly afterwards at least you have a place to take it to be fixed if the dealer installs it. I had an aftermarket unit installed in my previous vehicle, a Chevy Venture, and I had nothing but problems with it afterwards,not to mention electrical damage done during the installation.( The company that sold and installed the unit went bankrupt shortly after installing it after 75 years in business so I had very little recourse.)
Years ago GM recommended only factory remotes be installed in their vehicles,( there was even a warning printed in the owners manuals about this) due to the intricacies of the electrical systems and the chance for errors. Working in a garage I saw many customers bring their vehicles in with issues resulting from the installation of a remote starter system. They couldn't get any help from the dealer as it wasn't a factory unit and you can't count on the skill level of the installers. After witnessing that and my own experience with a previous vehicle I only will have a remote starter in my vehicle if it came installed from the factory, or it's a factory unit installed at the dealership. I usually don't recommend the dealer for service work in most cases due to the costs, but when it comes to something like an addition to the vehicle's electrical system, I'd rather pay a little extra and have factory certified techs do the installation.

I'm not aware if you can buy the GM units online without going through your dealer's parts department.
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