The buckle pretensioners more retracting the belt reel, there are variants witch pull the belt buckle back and thus simultaneously tighten the lower side seat belt together with shoulder side (Belt pretensioners). The restraining effect and the protection afforded against occupants sliding forward beneath the lap belt are improved still further by buckle tighteners.The tightening process in these two systems (Belt & Buckle pretensioner) takes place in the same period of time as for belt tighteners.This high-performance tighters are able to pull back an extended belt approx. 18cm in length in roughly 5ms
When open or increased resistance in Buckle pretensioner - Driver squib occurs. When the SRS warning light remains lit and a DTC code occurs, it means an open circuit, or increased resistance between control module and Pretensioner harness.
Item
Detecting Condition
Possible Cause
DTC Strategy
? Buckle pretensioner - Driver open or increased resistance
? Poor contact in the connector or wiring harness.
? Open circuit in wiring harness.
? Open circuit in DBKP squib.
? SRSCM Faulty.
Enable Conditions
? Ignition "ON"
Threshold Value
? DBKP Resistance = 6.0 Ohm ( more than 6O)
Diagnostic Time
Qualification
? More than 2 sec remaining
De-Qualification
? More than 4 sec remaining
Test Condition
Resister (O)
Ignition OFF
1.8? = R = 2.5?