How do you reset tire pressure monitor for 2009 Cadillac CTS?

To reset the tire pressure monitor on a 2009 Cadillac CTS, first ensure that all tires are properly inflated to the recommended pressure. Then, turn the ignition to the "On" position without starting the engine. Press and hold the "TPMS" reset button located under the dashboard until the tire pressure light blinks three times, then release it. Finally, start the vehicle and allow a few minutes for the system to reset and recalibrate.