ZEST BOLT Service Manual

SRS 5 10.2.5 SRS WARNING LAMP The “AIR BAG” warning lamp is located in the instrument cluster and controlled by SRS ECU.A warning indicator in instrument cluster will alert to any malfunction of the airbag SRS. Under normal /fault free condition, the air bag warning light comes on for approximately 3 seconds and goes off with ignition ON. The vehicle should always be checked for airbag SRS if any of the following symptoms occurs:  The warning indicator fails to illuminate for 3sec when ignition switch is turned ON.  The warning indicator remains ON and fails to extinguish within approximately 3 seconds after ignition switch is turned ON.  The warning indicator illuminates after the engine is started or while the vehicle is running. 10.2.6 SEAT BELT PRETENSIONERS WITH LOADLIMITERS The seat belt pre tensioners activate in conjunction with the SRS and provide additional protection in the event of frontal impact of the vehicle with sufficient severity. The seat belts for both front seating positions are equipped with pre-tensioning devices that are designed to remove any slack from the seat belts in the event of a collision. These devices improve the performance of the seat belt system by assuring that the belt is tight around the occupant in a collision. Along with pre-tensioning devices, the seat belts are also provided with load limiters which ensure that the occupant is optimally loaded by the seat belt. The load limiting devices are only used in conjunction with airbags. The airbag SRS warning indicator on the instrument cluster will alert you to any malfunction of seat belt pre-tensioner. NOTE: After any impact, always check the seat belts and pre-tensioners and replace if necessary. (a) Pre-tensioner device Pretensioner device is mounted in the retractor unit. The main function of a Pre-tensioner is to remove slack from the belt in the event of an accident to reduce forward movement of the occupant. The Pre-tensioner unit essentially consists of a ball cage comprising of a tube of steel balls surrounding a toothed wheel. The wheel is mounted on the belt-webbing spool. When the ECU senses a crash, depending on the crash severity, it sends a “fire” signal to the squib in the belt Pre-tensioner. The firing of the squib causes displacement of the balls in the tube. The movement of the balls causes rotation of the toothed wheel, which in turn rotates the webbing spool and removes the slack from the belt.