Seat Belt Pretensioner(hereinafter referred to BPT) is located at both side of center pillar.
BPT tightens seat belt before air bag deploys to protect passenger from bumping against crush pad, steering wheel and front window.
In BPT, there are a ignition circuit and cylinder for rewinding belt.
Cylinder has piston that can rewind seat belt in it.
Gas chamber generates expansive force of gases to push piston in cylinder.
Never measure resistance of BPT directly, Current of measuring device may cause unexpected BPT depoy.
The SRSCM sets DTC B1370 if there is a short to power in PBPT harness.
*In this case, SRSCM checks if there's any fault in circuit by sending current for a while.
Item
Detecting Condition
Possible cause
DTC Strategy
Check Resistance
Short to power in PBPT harness.
Poor connection of connected part.
Faulty PBPT.
Faulty SRSCM.
Enable Conditions
Ignition "ON"
Threshold Value
Diagnostic Time
Qualification
More than 4 sec
De-Qualification
More than 8 sec
Test Condition
Resistance
Ignition ON
1.6O < Squib R < 6.0O