4.
Using a scantool, clear the DTC.
Curtain Airbag (hereinafter referred to CAB)is located at driver and passenger side of headliner. It protects passenger's head and shoulder from fragments of glass or something sharpen caused by overturn. CAB is consist of air bag and inflator. Air bag reduces impact of collision by fillied up gas. Inflator keeps gas and uses it to deploy air bag on collision.
Never measure resistance of CAB directly, Current of measuring device may cause unexpected air bag deploy.
The SRSCM sets DTC B1473/B1477 if the measured resistance value of DCAB/PCAB circuit is more than the threshold value.
The SRSCM sets DTC B1474/B1478 if the measured resistance value of DCAB/PCAB circuit is less than the threshold value.
*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 Resistance | ● Poor connection of connected part. ● Poor connection between shorting bar and release pin. ● Faulty CAB. ● Faulty SRSCM. | ||
Enable Conditions | ● Ignition "ON" | |||
Threshold Value | B1473 B1477 | ● CAB Resistance ≥ 6.1Ω | ||
B1474 B1478 | ● CAB Resistance ≤ 1.1Ω | |||
Diagnostic Time | Qualification | ● More than 1 sec | ||
De-Qualification | ● More than 2 sec | |||
Test Condition | Resistance |
Ignition ON | 1.6Ω ＜ CAB resistance ＜ 4.7Ω |
Ignition "OFF", connect scantool.
Ignition "ON"＆ Engine "OFF", select "Diagnostic Trouble Codes(DTC)" mode.
Monitor diagnostic trouble code and present of trouble code.
Using a scantool, clear the DTC.
Is DTC present problem ?
▶ Go to "W/Harness Inspection" procedure.
▶ 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.
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.
Thoroughly check shorting bar/shorting bar release pin and connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
Has a problem been found?
▶ Repair as necessary and then go to "Verification of Vehicle Repair" procedure.
▶ Go to "Squib Circuit Inspection" procedure.
Ignition "OFF".
Disconnect (-) terminal cable from battery and wait for 1 minutes or more.
Disconnect CAB module and connect the dummy (0957A-38200) and dummy adapter (0957A-2G000) to main harness connector.
If dummy and dummy adaptor are not able to be prepared, use a known-good CAB or 2Ω resistor.
Connect (-) terminal cable to battery and Ignition "ON" ＆ Engine "OFF" and wait for 30 seconds or more.
Connect scantool to Data Link Connector(DLC) and clear DTC with scantool and diagnose again.
Is DTC present problem ?
▶ Go to "Main harness circuit inspection" procedure.
▶ Substitute a known-good CAB assembly, and check for proper operation.
If the problem is corrected, replace CAB and then go to "Verification of Vehicle Repair" procedure.
Ignition "OFF".
Disconnect the battery (-) terminal cable from the battery, and wait at least one minutes.
Disconnect CAB connector and SRSCM main harness connector.
Measure resistance between terminal "2" and "1" of the CAB harness connector.
Specification : approx. 1 Ω below
Is the measured resistance within specifications?
▶ 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.
▶ 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.
Refer to the DESCRIPTION in this TROUBLESHOOTING section.
