by Lof8
I have the keyless entry on my 06 DC because that is what came with the vehicle when I purchased it last Dec. I would have liked an alarm system and actually thought there was one installed because I saw an LED mounted on the console. Later when I was at home checking everything out I discovered I only had the keyless entry system, no alarm. There was evidence that an alarm system had been installed but it was a pretty poor job. I had wires shorting out in my drivers door which led to the door locks locking and unlocking whenever I opened or closed the driver side door. Most likely the factory keyless is still there if the truck was equipped originally. The best you could do would be to take the truck to a reputable shop to have the aftermarket alarm removed. Don't cut wires or unplug the unit, that might stop other things from working, including the ability to start the truck. I have seen some very bad alarm installs, and they can really cause a lot of issues. Let an expert fix it if you are not sure, that way they can get all things back to normal. As for the factory keyless, you need to get a fob and whatever it takes to program it, probably from the dealer, although Autozone sells replacements for some vehicles. Hope this helps.....

Source: I hate the aftermarket alarm that came in my truck. - Tundra ...
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