What is the reason to disconnect a vehicle battery before repairs?

• A. To improve radio reception
• B. To prevent battery from draining
• C. To prevent corrosion on terminals
• D. To prevent electrical shock or accidental deployment of airbags

Answer: (D)

Safety around airbags and electrical systems is the primary reason for disconnecting the vehicle battery before repairs. Airbags are controlled by an electronic system that stores charge and can deploy if a short, a damaged connector, or a power surge occurs while you’re working on the vehicle. By disconnecting the battery, you de-energize the system, greatly reducing the risk of electrical shock and preventing the accidental deployment of airbags as you work near wiring, connectors, or seats. While other issues like radio reception, battery drain, or terminal corrosion can be influenced by having the battery connected, they are not the main safety concern during repair—protecting people from sudden airbag deployment is the essential reason. Always follow the vehicle’s specific procedures, such as disconnecting the negative cable and allowing capacitors to discharge before beginning work.