2003 Toyota Echo Owners Manual - Page 39

-Front seat belt pretensioners SY13021a SP13504 SU13113a The driver and front passenger's seat belt pretensioners are designed to be activated in response to a severe frontal impact. When the airbag sensor detects the shock of a severe frontal impact, the front seat belts are quickly drawn back in by the retractors so that the belts snugly restrain the front seat occupants. The front seat belt pretensioners are activated even with no passenger in the front seat. Collisions occurring at certain speeds and angles may cause the seat belt pretensioners and SRS airbags not to operate all together. This indicator comes on when the ignition key is turned to the "ON" position. It goes off after about 6 seconds. This means the front seat belt pretensioners are operating properly. This warning light system monitors the airbag sensor assembly, front airbag sensors, side airbag sensors, door side airbag sensors, front seat belt pretensioner assemblies, inflators, warning light, interconnecting wiring and power sources. (For details, see "Service reminder indicators and warning buzzers" on page 86 in Section 1-5.) The front seat belt pretensioner system mainly consists of the following components and their locations are shown in the illustration. 1. Front airbag sensors 2. SRS warning light 3. Airbag sensor assembly 4. Front seat belt pretensioner assemblies The front seat belt pretensioners are controlled by the airbag sensor assembly. The airbag sensor assembly consists of a safing sensor and airbag sensor. 39 2003 ECHO from Aug. '02 Prod. (OM52481U)