Restraint > SRSCM > Troubleshooting > B1657 Crash Recorded in Belt Pretensioner only

General Description

In collision, SRSCM sends current to pertinent air bag for deployment. Besides SRSCM performs diagnosis of overall air bag system and light warning lamp if there's any fault in it. Main functions of SRSCM are as follows.

1.	Collision and Passenger presence Detection.

2.	Determination of BPT and air bag deployment in accordane with given condition.

3.	Internal and external diagnosis of air bag system.

4.	Warning by warning lamp if there's any fault in airbag system.

5.	Proffering data for scantool diagnosis.

DTC Description

The SRSCM sets DTC B1657 if any BPT deploys.

DTC Detecting Condition

Item

Detecting Condition

Possible cause

DTC Strategy

•	Check BPT deployment

•

SRSCM.

•	Belt pretensioner.

Enable Conditions

•	Ignition "ON"

Diagnostic
Time

Qualification

•

N/A

De-Qualification

•

N/A

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 scantool, clear the DTC.

Is DTC present problem ?

▶ DTC caused by deployment of BPT. Substitute with a SRSCM and check for proper operation. If the problem is corrected, replace SRSCM 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 scantool and select "Diagnostic Trouble Codes(DTC)" mode.

2.	Using a scantool, clear the DTC.

3.	Operate the vehicle within DTC Enable conditions in General information.

Are any DTC present ?

	▶ Go to the applicable troubleshooting procedure.
	▶ System is performing to specification at this time.