B1331

DTC B1326 FIS (FR0NT IMPACT SENSOR) - DRIVER SHORT TO GROUND

DTC B1331 FIS (FR0NT IMPACT SENSOR) - PASSENGER SHORT TO GROUND

GENERAL DESCRIPTION
Front Impact Sensor (FIS) located at both sides of the front of engine room detects head-on collision. When FIS delivers collision signal to SRSCM, SRSCM checks if safing sensor located in SRSCM detects collusion. And if both FIS and safing sensor detects collision simultaneously, SRSCM operates front air bag.

DTC DESCRIPTION
The SRSCM sets DTC B1326/B1331 if there is short to ground in DFIS/PFIS harness.

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 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 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
1. Ignition "OFF".
2. Disconnect the battery (-) terminal cable from the battery, and wait at least one minute.
3. Disconnect FIS connector and SRSCM main harness connector.




4. Measure resistance between terminal "1" or "2" of the FIS harness connector and chassis ground.

Specification : infinite

5. Is the measured resistance within specifications?

YES - Go to "Component 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.

COMPONENT INSPECTION
1. Ignition "ON" & Engine "OFF" and Using a scantool, clear the DTC.
2. Ignition "OFF".
3. Disconnect the battery (-) terminal cable from the battery, and wait at least one minute.
4. Disconnect FIS connector.
5. Substitute the FIS and check for proper operation.
6. Is DTC present problem?

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 a known-good FIS, and check for proper operation.
- If the problem is corrected, replace FIS 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.