Maybe this will help, if not it was worth a try. I just had my Chevy dealer install a GM factory remote starter in my 2006 Uplander . Chances are if you have the original fobs it is also a factory (or dealer installed GM unit.) To activate mine I have to hit the "LOCK" button on the fob and then within 10 seconds hit the "START" button, and the vehicle should start. I had the dealership install mine because I had seen too many bad aftermarket installations, including one on my '97 Venture. I made sure the next time I had one it was going to b installed by the dealer, so if any issues cropped up I hopefully wouldn't have any problems getting it fixed,(the company that installed the unit in my '97 went bankrupt one month after putting mine in...after 75 years in business) After I bought my Uplander I checked with my dealer's parts dept. They ran my VIN to make sure my vehicle was set up to receive a remote starter. Let us know if that procedure i outlined above works for your situation. Good luck.
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