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What causes the air bag light to stay on you have a 1991 Mazda miata?

Potential Causes for Airbag Light Staying On in a 1991 Mazda Miata:

1. Faulty Airbag Sensor: The airbag sensor, also known as the impact sensor or crash sensor, detects a collision and triggers the deployment of the airbags. A faulty sensor may cause the airbag light to stay on even if there is no issue with the airbags themselves.

2. Airbag Wiring Issues: Damaged or loose wiring related to the airbag system can cause the airbag light to illuminate. Check the wiring connections, especially under the seats and in the steering column, to ensure they are secure and free of any damage.

3. Clock Spring Malfunction: The clock spring is a spiral cable located in the steering column that allows the steering wheel to rotate while maintaining electrical connections for various components, including the airbag system. If the clock spring malfunctions, it can affect the communication between the airbag module and the sensors, causing the airbag light to stay on.

4. Airbag Module Failure: The airbag module, also known as the airbag control unit (ACU), is the central component of the airbag system responsible for monitoring and controlling the deployment of the airbags. A faulty airbag module may cause the airbag light to remain illuminated even if other system components function correctly.

5. Low Battery Voltage: In some cases, low battery voltage can cause various warning lights, including the airbag light, to come on. Ensure the battery has enough charge and connections are secure.

It's crucial to note that diagnosing and repairing airbag systems can be complex and potentially dangerous due to the sensitive nature of these systems. If you lack experience in automotive electrical work or dealing with airbag systems, it's recommended to consult a professional mechanic or an authorized Mazda repair center for proper diagnosis and repair.