Passlock uses a resistor in the ignition key to verify the key is genuine. If the system detects a problem, it disables the engine. The "security" light is a clear indicator of this.
Here's what likely happened and what you should try:
* Bad Key or Worn Key: The most common cause. The resistor in your key may be damaged or the key itself might be worn. Try any other keys you have for the car.
* Low Battery: A weak battery can sometimes confuse the Passlock system. Try jump-starting the car with a good battery and strong cables.
* Passlock Sensor Issues: The Passlock sensor itself (located in the ignition cylinder) can fail. This requires professional diagnosis and potentially replacement of the sensor or the entire ignition assembly.
* Security System Malfunction: While less likely than the Passlock problem, the car's entire security system could be malfunctioning.
What NOT to do: Don't try to bypass the security system yourself. This often leads to more damage and is not recommended.
What YOU SHOULD do:
1. Try spare keys: This is the absolute first thing to do. If another key works, you've found the problem.
2. Jump start the car: A weak battery can exacerbate Passlock issues.
3. Call a locksmith: A professional locksmith specializing in automotive security can often diagnose and resolve Passlock problems without replacing the entire ignition.
4. Tow to a mechanic: If the above steps don't work, take it to a trusted mechanic specializing in General Motors vehicles. They have the proper diagnostic tools to identify the exact issue.
In short, there is no kill switch you can easily access to fix this. It's a security system issue that needs professional attention if simple key or battery checks fail.
