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.
If you strike or spin the SRSCM at the IG “ON” state, the seat-belt pretensioner, curtain-airbag or side-airbag could be unfolded and bring on danger. Handle it with care.
The SRSCM sets DTC B1369 if there is a short to ground 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 Voltage |
•
Short to ground in PBPT harness.
•
Poor connection of connected part.
•
Faulty PBPT.
•
Faulty SRSCM. | |
Enable Conditions |
•
Ignition "ON" | ||
Threshold Value |
•
PBPT Squib line Voltage is < 0.64V | ||
Diagnostic Time | Qualification |
•
More than 2.5s (250ms x 10) | |
De-Qualification |
•
More than 5s(250ms x 20) | ||
Test Condition | Voltage |
Ignition ON | 0.64V ≤ Squib line Voltage ≤ 2.37V |
