B1348
DTC B1348 DRIVER AIRBAG RESISTANCE CIRCUIT SHORT TO GROUND (1ST STAGE)DTC B1483 DRIVER AIRBAG RESISTANCE CIRCUIT SHORT TO GROUND (2ND STAGE)
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 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 B1348/B1483 if there is a short to ground 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:
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 scantool, clear the DTC.
5. Is DTC present problem?
YES - Go to "W/Harness Inspection" procedure.
NO
- 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.
- 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 - Repair as necessary and then go to "Verification of Vehicle Repair" procedure.
NO - Go to "Squib Circuit Inspection" procedure.
SQUIB CIRCUIT INSPECTION
1. Ignition "OFF".
2. Disconnect (-) terminal cable from battery and wait for 1 minute 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 2 ohms 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?
YES - Go to "Clock Spring Circuit Inspection" procedure.
NO
- Substitute a known-good DAB assembly, and check for proper operation.
- If the problem is corrected, replace PCAB and then go to "Verification of Vehicle Repair" procedure.
CLOCK SPRING CIRCUIT INSPECTION
1. Ignition "OFF".
2. Disconnect the battery (-) terminal cable from the battery and wait at least one minute.
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. Measure resistance between terminal "1" or "2 "of the clock spring harness connector and chassis ground.
Specification : infinite
5. Is the measured resistance within specifications?
YES - Go to "Main harness circuit inspection" procedure.
NO
- Substitute the Clock spring and check for proper operation.
- If the problem is corrected, replace Clock spring and then go to "Verification of Vehicle Repair" procedure.
MAIN HARNESS CIRCUIT INSPECTION
1. Ignition "OFF".
2. Disconnect the battery (-) terminal cable from the battery and wait at least one minute.
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. [B1348] Measure resistance between terminal "1" or "2" of the DAB harness connector and chassis ground.
[B1483] Measure resistance between terminal "3" or "4" of the DAB harness connector and chassis ground.
Specification : infinite
5. Is the measured resistance within specifications?
YES
- 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
- 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 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.
4. Are any DTC present?
YES - Go to the applicable troubleshooting procedure.
NO System is performing to specification at this time.