* Does the car crank but not start? This is the most common security system issue.
* Do you hear a clicking sound when you try to start it? This could indicate a low battery or a problem with the starter.
* Do you get any warning lights on the dashboard? Specific lights can point to particular problems.
* Is the key fob working? Remote keyless entry problems can sometimes affect the security system.
* Did you recently replace the battery? Sometimes the security system needs to be reprogrammed after a battery change.
* Has the car been sitting unused for a long time? A drained battery can trigger security system issues.
Possible Problems and Troubleshooting Steps:
1. Battery: A weak or dead battery is the most frequent culprit. Have the battery tested at an auto parts store. Replace it if necessary.
2. Passlock System (VATS): The 1999 Lumina likely uses a Passlock system. This system uses a resistor in the ignition key to verify the key's authenticity. Problems can arise from:
* Worn ignition switch: The switch might be failing to read the resistor correctly.
* Damaged ignition key: The resistor in your key might be broken or damaged. A new key might be needed. Try all your keys.
* Faulty Passlock sensor: This sensor is part of the ignition system. A mechanic can diagnose this.
3. Security System Module: The security system's central module can malfunction. This requires professional diagnosis and likely replacement.
4. Wiring Issues: Damaged or corroded wiring related to the ignition system or security system can disrupt the system. A mechanic will need to check this.
5. Alarm System (if equipped): If you have a separate aftermarket alarm system, its malfunction could interfere with the car's starting.
What to Do:
1. Describe the exact problem: Be very specific about what's happening when you try to start the car.
2. Check the obvious: Ensure the battery is strong, and try all available keys.
3. Consult a repair manual: A repair manual specific to your 1999 Chevy Lumina can provide valuable troubleshooting information and wiring diagrams.
4. Seek professional help: If you're not comfortable working on the car's electrical system, take it to a qualified mechanic. They have the tools and expertise to diagnose and fix the problem. Be prepared to pay for diagnostic work, even if you decide not to repair it at that shop. A locksmith specializing in automotive keys may also be helpful if you suspect a key issue.
Avoid guessing and replacing parts randomly. This can be expensive and may not solve the problem. Proper diagnosis is key to fixing a car security system.
