* Factory installed system: Chevy offered various factory security features in 1999, ranging from simple theft deterrents to more sophisticated systems. Disabling these usually requires disconnecting the system's control module, which is often a challenging task requiring specialized knowledge and potentially dealer-level tools. Incorrectly disconnecting a factory system can damage the vehicle's electrical system.
* Aftermarket system: A huge variety of aftermarket security systems were available. These can range from simple alarms to complex systems with remote starters, immobilizers, etc. Disconnecting an aftermarket system depends entirely on the specific brand and model installed. Its instructions should be in the owner's manual, which you should find if you have the original system. Otherwise you'll need to trace the wiring.
To find out how to disable YOUR system:
1. Locate the security system's control module: This is usually a small black box, often tucked away under the dash, in the glove compartment, or even under the hood. Look for stickers or labels that might identify the brand and model of the system.
2. Consult the owner's manual: If you have the original owner's manual for the vehicle or the security system itself, it may contain instructions for disabling or disconnecting the system.
3. Check for a bypass switch or key: Some aftermarket systems include a hidden switch that disables the alarm or immobilizer.
4. Seek professional help: If you can't identify the system or safely disconnect it yourself, take your truck to a qualified automotive locksmith or car security specialist. This is the safest and most reliable option, preventing potential damage to your vehicle's electrical system. Attempting to disable a system you don't understand can lead to problems.
WARNING: Disconnecting a security system incorrectly can damage your vehicle's electrical system, trigger further alarms, or even prevent the vehicle from starting. Proceed with caution and consider seeking professional help if you're unsure.
