2004 Lexus ES 330 Owners Manual - Page 149

OCCUPANT RESTRAINT SYSTEM Seat belt pretensioners 16E544 The driver and front passenger's seat belt pretensioners are designed to be activated in response to a severe frontal impact. When the sensor detects a severe frontal impact, the front seat belts are quickly drawn back by the retractors so that the belts snugly restrain the front seat occupants. The front passengers's seat belt pretensioner will not activate if no passenger is detected in the front passenger seat by the front passenger occupant classification system. However, the front passenger's seat belt pretensioner may activate if luggage is put on the seat, or the seat belt is buckled up regardless of the presence of an occupant in the seat. (As for the front passenger occupant classification system, see page 152.) The seat belt pretensioners and SRS airbags may not operate together in case of collisions at a certain speeds and angles. 120 " 1 Front passenger occupant classification system (ECU and sensors) 2 Front seat belt pretensioner assemblies 3 SRS warning light 4 Front passenger's seat belt buckle switch 5 Front airbag sensors 6 Airbag sensor assembly