B2500
DTC B2500 WARNING LAMP FAILUREGENERAL 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 B2500 if there is any fault in air bag warning light circuit.
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 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 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 "Power Circuit Inspection" procedure.
POWER CIRCUIT INSPECTION
1. Ignition "OFF".
2. Remove the Instrument cluster from crash pad assembly.
3. Ignition "ON" & Engine "OFF".
4. Measure voltage between terminal "3" of the instrument cluster harness connector and chassis ground.
Specification : B+
5. Is the measured voltage within specifications?
YES - Go to "Control Circuit Inspection" procedure.
NO - Check airbag fuse, passenger compartment junction block, harness between junction block and SRS. Repair as necessary and go to "Verification of Vehicle Repair" procedure.
CONTROL CIRCUIT INSPECTION
1. Ignition "OFF".
2. Remove the instrument cluster.
3. Disconnect the instrument cluster connector and SRSCM main connector.
4. [ADVANCED] Release the shorting bar between terminal "50" and "49" of the SRSCM main harness connector.
[DEPOWERED] Release the shorting bar between terminal "7" and "6" of the SRSCM main harness connector.
5. [ADVANCED] Measure resistance between terminal "50" of the SRSCM main harness connector and terminal "4" of the instrument cluster harness connector.
[ADVANCED] Measure resistance between terminal "7" of the SRSCM main harness connector and terminal "4" of the instrument cluster harness connector.
Specification : 1 ohm below.
6. Is the measured resistance within specifications?
YES
- Thoroughly check for open and poor contact in the warning lamp.
- If it is abnormal, repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.
- If it is normal, substitute with 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 - Thoroughly check for open and contact resistance in control harness. Repair or replace as necessary 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.