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The RSCA off button in a Toyota Tundra is short for roll sensing curtain airbags. These are side airbags that activate if the vehicle is in a crash or rolls over. It's recommended to turn them off when doing intense off-roading to avoid them deploying unexpectedly during adventurous outings.
How can I tell if it's turned off if it doesn't show a light?
In a Toyota Tundra, the off switch for the RSCA deactivates the side curtain airbags that could deploy during intense off-road driving.
Hey Travis, as far as I know, the system stays on until you restart the ignition after starting up. If you press the button, it will continue to be active until you shut off the truck for over 30 seconds and then turn it back on. - Jerry, a ham radio operator with call sign KA0TXW