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To deactivate the alarm on a 2012 Ford F-150, start by shutting off the engine and removing the key from the ignition. Check the instrument cluster for a red lock light, indicating that the key isn't being recognized. Insert the original key and turn the vehicle to the on position without starting the engine. Give the vehicle a moment to recognize the key, which should then deactivate the alarm. If you encounter a different alarm issue, you can disconnect the vehicle's battery for 20 to 30 minutes to reset the vehicle to its factory settings.
To turn off the alarm on the 2012 Ford F-150, use the special key and start the ignition.