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Is it a factory security alarm or aftermarket? Are you disarming the alarm using the fob? What happens when you try to start the Jimmy after disarming the alarm - do you get only a flashing "Security" or "Theft" light, or do you just hear a loud click noise?
If it's a factory alarm then you need to get it disabled by the dealer. if it's an installed alarm you need to unplug the brain/ module and your car should run
Your 2002 Denali is equipped with a security system from the manufacturer. The installation of aftermarket security systems such as the one you are describing is just trouble waiting for a place to happen.
General Motors has published several Technical Service bulletins regarding such aftermarket equipment and warns of the problems that can occur including No-Start conditions, trouble with the keyless entry system, engine misfire problems, transmission shifting problems and severe damage to high-dollar parts like catalytic converters.
My professional recommendation is to remove all of the aftermarket equipment from the vehicle and resore the vehicle wiring harnesses to a condition that would be acceptable to the people that built the vehicle.
There is a yellow wire coming off the ignition switch wiring harness get to this wire and start your truck and then cut the wire and tape both ends.This will disable the PASSLOCK Security System.Wires are in steering column under the cover.
if it is a stock gm alarm, it is integral to the body control module and cannot be disabled. if it is an aftermarket, it depends entirely on how it was installed and what kind of system it is.
It sounds like your starter Kill switch is engaging. If you have an after market alarm installed cut the power to that by removing the in line fuse or cutting the power wire. If the alarm was part of the vehicle, which sounds possible based on your post, you can try resetting the ECM by removing the Negative battery terminal for 1 min then reconnecting. There should also be a fuse for the alarm in your fuse panel. If you remove that it should disable the kill switch.
yes the viper security system will do this,it may be in your best interest to get rid of this system and get a different alarm.it will do many more things too,get it out while you can still drive your truck,it happen to me.
First thing is to identify the alarm system, I.E.- who made it and what model it is? (like Viper, Automate, etc...)
Contact the aftermarket alarm manufacturer or the person that installed the alarm (if you had/know who installed the alarm system). Most major system have a phone number and a list of qualified installers for their systems. They will be able to direct you to a shop that can service the system. If your vehicle won't start, you may have to have it towed to the location to diagnose and correct the problem.
a factory keyless entry will not have an override but it does not disable starter.if you are have security issues it is problem with passlock system. if it is aftermarket alarm system then there is a button somewhere but varies where installer put it
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