DTC B2207: Occupant Restraint Controller Internal 1; DTC B2208: Occupant Restraint Controller Internal 2; DTC B2209: Occupant Restraint Controller Internal 3; DTC B220A: Occupant Restraint Controller Internal 4; DTC B220B: Occupant Restraint Controller Firing Stored Energy; DTC B220C: Occupant Restraint Controller Accelerometer 1; DTC B220D: Occupant Restraint Controller Accelerometer 2: Diagnosis

Required Special Tools: 

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
  • MB991824: Vehicle Communication Interface (V.C.I.)
  • MB991827: M.U.T.-III USB Cable
  • MB991910: M.U.T.-III Main Harness A (Vehicles with CAN communication system)

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

     Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
2. STEP 2. Recheck for diagnostic trouble code. 

   Check again if the DTC is stored.

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

   Q: Are any "Stored" or "Active" DTCs output? 

   • YES:  Replace the SRS-ECU (Refer to SRS CONTROL UNIT (SRS-ECU)  ).
   • NO:  There is an intermittent malfunction such as poor engaged connector(s) or open circuit (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).