B2503

B2503

Component Location:

General Description
Air bag warning lamp is located at cluster
When key is in 'ignition on' position, SRSCM performs diagnosis of overall air bag system. If there's no fault, air bag.
Warning lamp in cluster flickers for a while and then goes out.
SRSCM measures voltage of out terminal of warning lamp to check if warning lamp is operated in accordance with signal SRSCM sends.

DTC Description
The SRSCM sets DTC B2503 if there is an open circuit or short to ground in air bag circuit harness.

DTC Detecting Condition:

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 - 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 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 "Main harness circuit inspection" procedure.

Main harness Circuit Inspection
4. Ignition "OFF".
5. Disconnect the battery (-) terminal cable from the battery, and wait at least one minute.
6. Disconnect I/P JUNCTION BOX I/P-A. connector and SRSCM main harness connector.
7. Measure resistance value between terminal "49" of main harness of SRSCM and "4" of harness of I/P JUNCTION BOX(I/P-A).

Specification: 0 ohms






8. Is the measured resistance within specifications?

YES - Go to "Main harness circuit inspection" 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.

Main harness Circuit Inspection
9. Ignition "OFF".
10. Remove the Instrument cluster from crash pad assembly.
11. Ignition "OFF" & Engine "OFF".
12. Measure resistance between terminal "13" of the instrument cluster harness connector and chassis ground.

Specification: Infinity






13. Is the measured resistance within specifications?

YES
- Check warning lamp 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.

NO
- Check airbag fuse, junction block, Warning Lamp, harness between junction block and SRSCM. Repair as necessary and 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 - Go to the applicable troubleshooting procedure.

NO - System is performing to specification at this time.