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Home >> Mitsubishi >> 2010 >> Lancer ES, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 6 (Supplemental Restraint System (SRS) -- Lancer Evolution) >> SRS Air Bag Diagnosis >> Diagnostic Trouble Code Procedures < SRS-Ecu > >> DTC B1B13: Driver's Knee Air Bag (Squib) System (Short Circuit Between Squib Circuit Terminals) >> Diagnosis

DTC B1B13: Driver's Knee Air Bag (Squib) System (Short Circuit Between Squib Circuit Terminals): Diagnosis

WARNING: This page is about a different car, the 2008 Mitsubishi Lancer. However, it is still accessible from the selected car via links, so may be relevant.

Required Special Tools: 

  1. STEP 1. Using scan tool MB991958, diagnose the CAN bus line. 
    CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
    1. Connect scan tool MB991958. 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? 

    YES  : Go to Step 2.

    NO  : Repair the CAN bus line (Refer to DIAGNOSIS ).

    Fig 1: Connecting Special Tool MB991910 To Data Link Connector
    G05396230Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  2. STEP 2. Recheck for diagnostic trouble code. 

    Check again if the DTC is set.

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

    Q: Is the DTC set? 

    YES  : Go to Step 3.

    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 SRS-ECU connector C-37 and Knee air bag module connector C-39. 
    1. Disconnect the negative battery terminal.
    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 C-37 SRS-ECU connector. Then connect the connector.
      Fig 2: Turning Lock Lever
      G05396231Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    3. After disconnecting the C-39 harness side connectors, connect the connectors again. For the C-39 connector disconnection, use a flat-tipped screwdriver to unlock the locking button at the harness side connector by withdrawing it to ward you in two stages, and then disconnect the connector.
    4. Connector the negative battery terminal.
    5. Erase the diagnostic trouble code memory, and check the diagnostic trouble code.
      Fig 3: Identifying Knee Air Bag Module Connector C-39
      G05396232Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

    Q: Is DTC B1B13 set? 

    YES  : Go to Step 4.

    NO  : The procedure is complete. It is assumed that DTC B1B13 set because connector C-37 or C-39 was engaged improperly.

  4. STEP 4. Check the knee air bag module. 
    1. Disconnect the negative battery terminal.
    2. Disconnect knee air bag module connector C-39. Use a flat-tipped screwdriver to unlock the locking button at the harness side connector by withdrawing it toward you in two stages, and then disconnect the connector.
      Fig 4: Identifying Knee Air Bag Module Connector C-39
      G05396233Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    3. Connect special tool MB991865 to special tool MB991884.
    4. Connect special tool MB991884 to the C-39 harness side connector.
    5. Connect the negative battery terminal.
    6. Erase diagnostic trouble code memory, and then check the diagnostic trouble code.

    Q: Is DTC B1C36 set? 

    YES  : Go to Step 5.

    NO  : Replace the driver's knee air bag module (Refer to KNEE AIR BAG MODULE  . Then go to  Step 7.

    Fig 5: Connecting Special Tool MB991884 To C-39 Harness Side Connector
    G05396234Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  5. STEP 5. Check the knee air bag module circuit. Measure the resistance at the SRS-ECU connector C-37. 
    1. Disconnect the negative battery terminal.
    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 C-37 SRS-ECU connector.
      Fig 6: Turning Lock Lever
      G05396235Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

      DANGER 

      To prevent the knee air bag module from deploying unintentionally, disconnect the knee air bag module connector C-39 to short the squib circuit. 

    3. Disconnect knee air bag module connector C-39. Use a flat-tipped screwdriver to unlock the locking button at the harness side connector by withdrawing it toward you in two stages, and then disconnect the connector.
      Fig 7: Identifying Knee Air Bag Module Connector C-39
      G05396236Courtesy 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 a cable tie [3 mm (0.12 inch) wide, 0.5 mm (0.02 inch) thick] between terminals 1, 2 and the short spring to release the short spring.
      Fig 8: Inserting Cable Tie Between Terminals
      G05396237Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    5. Check for continuity between C-37 harness side connector terminals 1 and 2.

      It should be an open circuit.

    Q: Is it open circuit? 

    YES  : Erase the diagnostic trouble code memory, and check the diagnostic trouble code. If DTC B1B13 sets, replace the SRS-ECU (Refer to SRS CONTROL UNIT (SRS-ECU)  ). Then go to  Step 7.

    NO  : Go to Step 6.

    Fig 9: Checking Continuity Between C-37 Harness Side Connector Terminals 1 And 2
    G05396238Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  6. STEP 6. Check the harness for short circuit between SRS-ECU connector C-37 (terminal No. 35 and 36) and knee air bag module connector C-39 (terminal No. 2 and 1). 

    Q: Are harness wires between SRS-ECU connector C-37 (terminal No. 1 and 2) and knee air bag module connector C-39 (terminal No. 2 and 1) in good condition? 

    YES  : Go to Step 7.

    NO  : Replace the harness wires between SRS-ECU connector C-37 and knee air bag module connector C-39. Then go to Step 7.

  7. STEP 7. Recheck for diagnostic trouble code. 

    Check again if the DTC is set.

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

    Q: Is DTC B1C36 set 

    YES  : Return to  Step 1.

    NO  : The procedure is complete.

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