B1349
General Description
Driver Air bag module (hereinafter referred to DAB) located at center of steering wheel protects driver by reducing impact of collision.
DAB is consist of air bag, pat cover and two inflator.
There are power,circuit for ignition, gas generator and diffuser screen in inflator.
Air bag reduces impact of collision by filled up gas.
In collision, pat cover splits and through this crack, air bag emerges and deploys.
Inflator generates gas that expands air bag.
Clock spring is located between steering wheel and column. It connects SCSRM to DAB.
CAUTION:
Never measure resistance of DAB directly, Current of measuring device may cause unexpected air bag deploy.
DTC Description
The SRSCM sets DTC B1349 if there is a short to power in DAB harness
*In this case, SRSCM checks if there's any fault in circuit by sending current for a while.
DTC Detecting Condition
Specification
Diagnostic Circuit Diagram
Monitor Scantool Data
1. Ignition "OFF", connect scantool.
2. Ignition "ON"& Engine "OFF", select "Current Data" mode.
3. Monitor the "Driver airbag(1st stage) resistance" parameter on the Scantool.
Specification :
0.9Ohms< Resistance of Driver airbag(1st stage) < 6.6Ohms
Reference :
In a case of an open in the Driver airbag(1st stage) circuit : FAIL
In a case of a short to battery in the Driver airbag(1st stage) circuit: FAIL
In a case of a short to ground in the Driver airbag(1st stage) circuit : FAIL
Fig.1) Normal Data
4. Is parameter displayed within specifications?
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?
Squib Circuit Inspection
1. Ignition "OFF".
2. Disconnect (-) terminal cable from battery and wait for 1 minutes or more.
3. Remove the DAB module and connect the dummy (0957A-38200) and dummy adapter (0957A-2G000) to DAB connector of the clock spring harness connector.
NOTE:
If dummy and dummy adaptor are not able to be prepared, use a known-good DAB or 2Ohms resistor.
WARNING:
Lay Removed DAB facing upward for unexpected air bag deploy.
4. Connect (-) terminal cable to battery and Ignition "ON" & Engine "OFF" and wait for 30 seconds or more.
5. Connect scantool to Data Link Connector(DLC) and clear DTC with scantool and diagnose again.
6. Is DTC present problem ?
Clock Spring Circuit Inspection
1. Ignition "OFF".
2. Disconnect the battery (-) terminal cable from the battery and wait at least one minutes.
3. Remove DAB module and disconnect SRSCM connector of the clock spring harness.
WARNING:
Lay Removed DAB facing upward for unexpected air bag deploy.
4. Connect the battery (-) terminal cable to the battery and Ignition "ON" & Engine "OFF".
5. Measure Voltage between terminal "Low.1" or "High.1" of the clock spring harness connector and chassis ground.
Specification :0V
6. Is the measured resistance within specifications?
Main harness Circuit Inspection
1. Ignition "OFF" and wait at least one minutes.
2. Disconnect the battery (-) terminal cable from the battery and wait at least one minutes.
3. Remove DAB module and disconnect SRSCM connector of the main harness.
4. Connect the battery (-) terminal cable to the battery and Ignition "ON" & Engine "OFF" and wait for 30 seconds or more.
WARNING:
Lay Removed DAB facing upward for unexpected air bag deploy.
5. Measure voltage between terminal "Low.1" or "High.1" of the DAB harness connector and chassis ground.
Specification :approx. 0V
6. Is the measured voltage within specifications?
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 ?
