2004 Lexus RX 330 Owners Manual - Page 209

OCCUPANT RESTRAINT SYSTEMS The front seat belt pretensioner system mainly consists of the above components, and their locations are shown in the illustration. The front seat belt pretensioners are controlled by the airbag sensor assembly. The airbag sensor assembly consists of a safing sensor and airbag sensor. When the front seat belt pretensioners are activated, an operating noise may be heard and a small amount of non-toxic gas may be released. This does not indicate that a fire is occurring. This gas is normally harmless. Once the front seat belt pretensioners have been activated, the seat belt retractors remain locked. CAUTION Do not modify, remove, strike or open the front seat belt pretensioner assemblies, airbag sensor or surrounding area or wiring. Failure to follow these instruction may prevent the seat belt pretensioners from activating correctly, cause sudden operation of the system or disable the system, which could result in death or serious injury. Consult your Lexus dealer about any repairs and modifications. 186