Which method is essential in disabling a vehicle’s electrical system during rescue?

Removing the 12 V DC battery is essential for disabling a vehicle's electrical system during a rescue. This method effectively eliminates the power source for all electrical systems within the vehicle, including airbags and other critical components that could pose a danger to rescuers or the victims inside the vehicle. In situations where rapid access is necessary, disconnecting the battery helps prevent accidental deployments of safety devices and preserves the safety of everyone involved in the rescue.

Other methods, such as cutting wires or manipulating the ignition switch, may not provide a complete disconnection of power, and could still leave certain systems active. Additionally, disabling the braking system is not aimed at turning off the electrical system but could create additional hazards for the rescuers and the vehicle’s occupants. Therefore, the procedure of removing the battery is the most reliable and universally applicable method for ensuring that all electrical systems are fully disabled during a rescue operation.