1. Turn the ignition switch to OFF.
2. Disconnect the ground cable from battery and wait for at least 20 seconds before starting work.
3. Remove the front outer seat belt. 
4. Remove the nuts and then remove the side airbag sensor.
CAUTION:
Do not separate the side airbag sensor and bracket. It cause airbag system malfunction. Always replace the new parts when removed the sensors from the bracket.
5. Disconnect the airbag connector.