I use the Directed Electronics Avital 4100 remote start keyless entry systems, the makers of Clifford Matrix, Viper, Hornet, Valet…
What year ?2004? if so
4.2l or 5.3l ?
39.90 extra for the bypass, it controls lock/unlock, and arm/ disarm, of factory security system, if you choose to NOT use those features then you will not need that bypass, BUT the alarm will activate if the vehicle starts without this bypass,
no additional installation fee for board members for trail Blazer/ envoy