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Home >> Mitsubishi >> 2014 >> Lancer SE >> Repair and Diagnosis >> External Pages >> Different car >> Section 37 (Supplemental Restraint System (SRS) - With Diagnostics) >> SRS Air Bag Diagnosis >> Diagnostic Trouble Code Procedures >> DTC B1605: Seat belt pre-tensioner (driver's side) (squib) system (shorted to squib circuit ground) >> Diagnosis

DTC B1605: Seat belt pre-tensioner (driver's side) (squib) system (shorted to squib circuit ground): 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. 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. Use the flat-tipped screwdriver to pull out the locking button of harness side connector. After releasing the lock, disconnect the seat belt pre-tensioner (driver's side) harness side connector.
      Fig 1: Pulling Out Locking Button Of Harness Connector
      G09666653Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    3. Connect special tool dummy resistor (MB991865) to special tool resistor harness (MB991884).
    4. Connect special tool resistor harness to the seat belt pre-tensioner (driver's side) harness side connector.
    5. Connect the negative battery terminal.
    6. After erasing the DTC memory, check the DTC again.
    7. Disconnect the negative battery terminal.

    Q: Is the DTC B1605 stored? 

    1. YES:  Go to Step 4.
    2. NO:  Replace the seat belt with pre-tensioner (driver's side) (Refer to SEAT BELTS WITH PRE-TENSIONER  ).
      Fig 2: Identifying Harness Side Connector And Special Tools
      G09666654Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  4. STEP 4. Resistance 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.
      WARNING: To release the SRS-ECU connector short spring in the following operations, disconnect this seat belt pre-tensioner connector, and keep the squib circuit shorted.
      Fig 3: Disconnecting SRS-ECU Connector
      G09666655Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    3. Use the flat-tipped screwdriver to pull out the locking button of harness side connector. After releasing the lock, disconnect the seat belt pre-tensioner (driver's side) harness side connector.
      Fig 4: Pulling Out Locking Button Of Harness Connector
      G09666656Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
      CAUTION: The short spring may not be released due to the insufficient insertion. Therefore, insert the insulator for 4 mm (0.16 inch) or more.
    4. Insert an insulator [3 mm (0.12 inch) wide, 0.5 mm (0.02 inch) thick] such as cable tie PTD+, PTD- line between the SRS-ECU connector the short spring, and release the short spring.
    5. Take the measurements below at the SRS-ECU harness side connector.
      • Continuity PTD+, PTD- line between SRS-ECU connector and body ground
        Fig 5: Identifying Harness Side Connector And Cable Tie
        G09666657Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

        OK: No continuity 

    Q: Is the check result normal? 

    1. YES:  Go to Step 5.
    2. NO:  Repair the wiring harness PTD+, PTD- line between the SRS-ECU connector and the seat belt pre-tensioner connector.
  5. STEP 5. 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 B1605 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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