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Home >> Mitsubishi >> 2014 >> Lancer ES Sportback >> Repair and Diagnosis >> External Pages >> Different car >> Section 37 (Supplemental Restraint System (SRS) - With Diagnostics) >> SRS Air Bag Diagnosis >> Diagnostic Trouble Code Procedures >> DTC B1403: Driver's air bag module (1st squib) system (shorted to squib circuit power supply); DTC B1483: Driver's air bag module (2nd squib) system (shorted to squib circuit power supply) >> Diagnosis

DTC B1403: Driver's air bag module (1st squib) system (shorted to squib circuit power supply); DTC B1483: Driver's air bag module (2nd squib) system (shorted to squib circuit power supply): Diagnosis

WARNING: This page is about a different car, the 2014 Mitsubishi Outlander. However, it is still accessible from the selected car via links, so may be relevant.
  1. STEP 1. Using scan tool (M.U.T.-III), diagnose the CAN bus line. 
    CAUTION: To prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-III).
    1. Connect scan tool (M.U.T.-III). Refer to "HOW TO CONNECT THE SCAN TOOL  ."
    2. Turn the ignition switch to the "ON" position.
    3. Diagnose the CAN bus line.
    4. Turn the ignition switch to the "LOCK" (OFF) position.

    Q: Is the CAN bus line found to be normal? 

    1. YES:  Go to Step 2.
    2. NO:  Repair the CAN bus line (Refer to DIAGNOSIS ).
  2. STEP 2. Recheck for diagnostic trouble code. 

    Check again if the DTC is stored.

    1. Erase the DTC.
    2. Turn the ignition switch to the "ON" position.
    3. Check if the DTC is stored.
    4. Turn the ignition switch to the "LOCK" (OFF) position.

    Q: Is the DTC stored? 

    1. YES:  Go to Step 3.
    2. NO:  There is an intermittent malfunction such as poor engaged connector(s) or open circuit (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
  3. STEP 3. Check the diagnostic trouble code by connecting a dummy resistor. 
    1. Check that the negative battery terminal is disconnected. If the negative battery terminal is connected, disconnect it.
    2. Use the flat-tipped screwdriver to pull out the locking button of wiring harness side connector, and release the lock.
    3. Connect special tool dummy resistor (MB991865) to special tool resistor harness (MB991866).
      CAUTION: Do not insert a probe directly into the terminal from the connector front side as the connector contact pressure may be weakened.
      Fig 1: Pulling Out Locking Button Of Wiring Harness Side Connector
      G09666503Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    4. Insert the resistor harness probe (special tool) as shown.
    5. Connect the negative battery terminal.
    6. After erasing the diagnostic trouble code memory, check the diagnostic trouble code again.
    7. Disconnect the negative battery terminal.
      CAUTION: Always DTC B1483 is stored when checking DTC B1403. This is because the second side terminal is isolated when checking it. DTC B1483 is stored but this is not a fault. In addition, always DTC B1403 is stored when checking DTC B1483 because the first side terminal is isolated.
      Fig 2: Identifying Air Bag Module Connector, Resistor And Harness
      G09666504Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    8. Erase the diagnostic trouble code memory, and check the diagnostic trouble code.

    Q: Is the checked DTC stored? 

    1. YES:  Go to Step 4.
    2. NO:  Replace the driver's air bag module (Refer to DRIVER'S AIR BAG MODULE AND CLOCK SPRING  ).
  4. STEP 4. Diagnosis check by dummy resistor connection. 
    1. Check that the negative battery terminal is disconnected. If the negative battery terminal is connected, disconnect it.
    2. Disconnect the clock spring connector.
    3. Connect special tool dummy resistor (MB991865) to special tool resistor harness (MB991866).
      CAUTION: Do not insert a probe directly into the terminal from the connector front side as the connector contact pressure may be weakened.
    4. Insert the resistor harness probe from the back of harness side connector DQ1-, DQ1+ line < B1403 >.

      Insert the resistor harness probe from the back of harness side connector DQ2-, DQ2+ line < B1483 >.

      Fig 3: Identifying Clock Spring Connector, Resistor And Harness
      G09666505Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    5. Connect the negative battery terminal.
    6. After erasing the diagnostic trouble code memory, check the diagnostic trouble code again.
    7. Disconnect the negative battery terminal.
      CAUTION: Always DTC B1483 is stored when checking DTC B1403. This is because the second side terminal is isolated when checking it. DTC B1483 is stored but this is not a fault. In addition, always DTC B1403 is stored when checking DTC B1483 because the first side terminal is isolated.
    8. Erase the diagnostic trouble code memory, and check the diagnostic trouble code.

    Q: Is the checked DTC stored? 

    1. YES:  Go to Step 5.
    2. NO:  Replace the clock spring (Refer to DRIVER'S AIR BAG MODULE AND CLOCK SPRING  ).
  5. STEP 5. Voltage measurement at the SRS-ECU connector. 
    1. Check that the negative battery terminal is disconnected. If the negative battery terminal is connected, disconnect it.
    2. While pushing the part "A" indicated in the figure of the harness side connector, turn the lock lever to the direction of the arrow to release the lock lever, and disconnect the SRS-ECU connector.
      CAUTION: To release SRS-ECU connector short spring in the following operations, disconnect this clock spring connector, and keep the squib circuit shorted.
    3. Disconnect the clock spring connector.
      Fig 4: Disconnecting SRS-ECU Connector
      G09666506Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
      CAUTION: Insert an insulator such as a cable tie to a depth of 4mm (0.16 inch) or more, otherwise the short spring will not be released.
    4. Insert the insulator [3 mm (0.12 inch) wide, 0.5 mm (0.02 inch) thick] such as cable tie between the DQ1-, DQ1+ line, and then release the short spring < B1403 >.

      Insert the insulator [3 mm (0.12 inch) wide, 0.5 mm (0.02 inch) thick] such as cable tie between the DQ2-, DQ2+ line, and then release the short spring < B1483 >.

    5. Connect the negative battery terminal.
    6. Ignition switch: ON
    7. Take the measurements below at the harness side connector.
      Fig 5: Identifying Harness Side Connector And Cable Tie (1st Squib)
      G09666507Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
      • Voltage between DQ1-, DQ1+ line and body ground < B1403 >

        OK: 1 V or less 

      • Voltage between DQ2-, DQ2+ line and body ground < B1483 >

        OK: 1 V or less 

        Fig 6: Identifying Harness Side Connector And Cable Tie (2nd Squib)
        G09666508Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    8. Disconnect the negative battery terminal.

    Q: Is the check result normal? 

    1. YES:  Go to Step 6.
    2. NO:  Repair the wiring harnesses DQ1-, DQ1+ line < B1403 > or DQ2-, DQ2+ line < B1483 > between the clock spring connector and the SRS-ECU connector.
  6. STEP 6. Recheck for diagnostic trouble code. 

    Check again if the DTC is stored.

    1. Erase the DTC.
    2. Turn the ignition switch to the "ON" position.
    3. Check if the DTC is stored.
    4. Turn the ignition switch to the "LOCK" (OFF) position.

    Q: Is DTC B1403 (1st squib) or B1483 (2nd squib) stored? 

    1. YES:  Replace SRS-ECU (Refer to SRS CONTROL UNIT (SRS-ECU)  ).
    2. NO:  Intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
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