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 - Passenger 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
? Check resistance
? Contact resistance in PBKP circuit.
? Faulty Squib.
Enable Conditions
? Ignition "ON"
Threshold Value
? PBKP resistance = 6.1 ?
? Tolerance band : 4.7 ? < Rs < 6.1 ?
Diagnostic Time
Qualification
? More than 1 sec
De-Qualification
? More than 2 sec
Test Condition
PBKP circuit resistance(O)
Ignition OFF
1.9 ? < Rs < 2.7 ?