B1370

B1370

Component Location:

General Description
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.

CAUTION: Never measure resistance of BPT directly, Current of measuring device may cause unexpected BPT deploy.

DTC Description
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

DTC Detecting Condition:

Specification:

Schematic Diagram:

Monitor Scantool Data
1. Ignition "OFF", connect scantool.
2. Ignition "ON"& Engine "OFF", select "Diagnostic Trouble Codes (DTC)" mode.
3. Monitor diagnostic trouble code and present of trouble code.
4. Using a scan tool, clear the DTC.






5. Is DTC present problem?

YES
a. Go to "W/Harness Inspection" procedure.

NO
a. Displaying nothing (no DTC) or DTC with label "H" (historical) shows that Fault is intermittent caused by poor contact in the part's and/or SRSCM connector or was repaired and SRSCM memory was not cleared. Thoroughly check shorting bar/shorting bar release pin and connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
b. Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.

Terminal and Connector Inspection
1. Many malfunctions in the electrical system are caused by poor harness and terminals.Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check shorting bar/shorting bar release pin and connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found?

YES
a. Repair as necessary and then go to "Verification of Vehicle Repair" procedure.
NO
a. Go to "Squib Circuit Inspection" procedure.

Squib Circuit Inspection
4. Ignition "OFF".
5. Disconnect (-) terminal cable from battery and wait for 1 minute or more.
6. Disconnect PBPT module and connect the dummy (0957A-38200) and dummy adapter (0957A-1C000) to main harness connector.

CAUTION: If dummy and dummy adaptor are not able to be prepared, use a known-good PBPT or 2 ohms resistor.

7. Connect (-) terminal cable to battery and Ignition "ON" & Engine "OFF" and wait for 30 seconds or more.
8. Connect scantool to Data Link Connector (DLC) and clear DTC with scantool and diagnose again.






9. Is DTC present problem?

YES
a. Go to "Main harness circuit inspection" procedure.

NO
a. Substitute a known-good PBPT assembly, and check for proper operation. If the problem is corrected, replace PBPT and then go to "Verification of Vehicle Repair" procedure.

Main harness Circuit Inspection
10. Ignition "OFF".
11. Disconnect the battery (-) terminal cable from the battery and wait at least one minute.
12. Disconnect PBPT connector and SRSCM main harness connector.
13. Connect the battery (-) terminal cable to the battery and Ignition "ON" & Engine "OFF".
14. Measure voltage between terminal "1 or 2" of the PBPT harness connector and chassis ground.

a. Specification : approx. 0 V






15. Is the measured voltage within specifications?

YES
a. Substitute a known-good SRSCM, and check for proper operation. If the problem is corrected, replace SRSCM and then go to "Verification of Vehicle Repair" procedure.

NO
a. Substitute the SRS main harness and check for proper operation. If the problem is corrected, replace SRS main harness and then go to "Verification of Vehicle Repair" procedure.

Verification of Vehicle Repair
After a repair, it is essential to verify that the fault has been corrected.
1. Connect scan tool and select "Diagnostic Trouble Codes (DTC)" mode
2. Using a scan tool, clear the DTC.
3. Operate the vehicle within DTC Enable conditions in General information.
4. Are any DTC present?

YES
a. Go to the applicable troubleshooting procedure.

NO
a. System is performing to specification at this time.