Fig.1) Belt pretensioner
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 B136100 if the measured resistance value of DBPT circuit is more than the threshold value.
*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
Poor connection of connected part.
Poor connection between shorting bar and release pin.
Faulty DBPT.
Check SRSCM
Enable Conditions
Ignition "ON"
Threshold Value
DBPT resistance > 6.9?
Diagnostic Time
Qualification
More than 2s (200ms x 10)
De-Qualification
More than 4s (200ms x 20)
Test Condition
Resistance
Ignition ON
1.0O < Squib resistance < 6.9O