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Still on my bb......so don't have that info yet....

The following doesn't pertain to the problem in the denali.....

Gm uses their data system, all the new dodges use a can bus data system, ford is the only us mfg who hasn't gone all out with data systems......
90% of all mid-high end us mfg's use transponder key systems too, when adding security systems to these cars there are modules which you connect most all system wires to, then that module connects to the car via 1 or 2 wires and your done. And the ones that don't require specific valued resistors to be used to trigger certain features like door locks and such......without the tech support some of the aftermarket security companies offer there is NO way you could figure some of them out without damaging electronics...

some use flash memory which you need to program from a pc, others use specific modules, which can be a hassle if it's a crossover year as it's easy to grab the wrong module and when it doesn't work you need to start all over........so there's good and bad from the aftermarket standpoint....but it's definately changed drastically over the past 10 years, which is why you NEVER let the rookie kid at best buy touch your car.....