... he strongly advised against it because of all the modules and electrical systems that have to be bypassed during installation. Once an aftermarket installer starts goofing around w/ the electronics and messes something up, the factory warranty is voided. So no aftermarket alarm for my 'Hoe. :cryin: @ least until the warranty runs out or gets close to running out... :
If, and only if, something goes wrong with the vehicle due to an aftermarket product, then the warranty is subject to being voided. But the dealership has to PROVE that the aftermarket part caused the problem. They can not void your warranty just because you decided to have an aftermarket product, such as an alarm, installed rather than GM's own product. The Magnuson-Moss Act is a Federal law that protects consumers against voided warranties due to simply installing aftermarket parts.
Also, the factory anti-theft system can easily be integrated into for remote start operation just like the rest of the electrical system, basically the same way GM does it. There are modules that don't bypass anything. They are flashed to integrate with the vehicle's BCM ,PCM, ECM, etc. via the vehicle's communication system (Class !!, LAN, CAN). Dealerships like to tell these things to customers so that they get the business, and also the fact that when a vehicle comes in for service, their technicians aren't trained to diagnose how aftermarket products affect factory systems.
DEI's new RS sytems with their newly DSM integrated transceivers operate up to a 1 mile range, and can be integrated to do everything the factory system can do, and lots more, including turning on heated seats, memory seat and pedal positions for different drivers, defrost, and more. PLus it's a 2-way system, so the module let's you know what's going on with your vehicle.
Sorry to rant on, but I've dealt with dealerships for 15 years and know how they operate. I've even used to work for one of the Big 3's warranty repair facility. I hate how most (not all) dealerships mislead consumers when it comes to aftermarket accessories and warranties. And the first thing most techs do when they see anything aftermarket is stop right where they are and blame the problem on the installation of the aftermarket part.