Here's why:
* Diagnostic Trouble Codes (DTCs): The airbag control module (ACM) stores DTCs that indicate why the airbag light illuminated in the first place. Replacing parts doesn't automatically erase these codes. The new module likely has codes indicating uninitialized sensors, etc.
* System Calibration: The ACM needs to be calibrated to the specific vehicle's sensors and wiring. This isn't something you can do manually.
* Safety Concerns: Improperly resetting the airbag system could lead to malfunctioning airbags during a crash, resulting in serious injury or death.
What you need to do:
1. Professional Diagnostic Scan: Take your Cavalier to a qualified mechanic or an automotive repair shop with a scan tool capable of communicating with the airbag system. A generic OBD-II scanner won't suffice for this. You need a scan tool that can access and clear airbag system DTCs and potentially perform calibrations. Some shops specialize in airbag repairs and will have the right equipment.
2. Code Clearing and System Check: The mechanic will use the scan tool to clear any DTCs stored in the ACM. They'll then perform a system check to ensure all components are functioning correctly. This might involve verifying sensor readings and other diagnostic steps.
3. Verification: After clearing the codes, the airbag light should turn off. However, the mechanic should verify the system's functionality to ensure everything is working as it should before returning the car to you.
In short: Do not attempt to reset the airbag light yourself. It's crucial to have a professional perform this service to guarantee the safety and proper functioning of your airbag system. Trying to bypass this process is extremely dangerous.
