DTC B223D: OCM (Occupant Classification-ECU) DTC Present: Diagnosis

Required Special Tool:

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)

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.
STEP 2. Recheck for diagnostic trouble code.
Check that the DTC is stored in the occupant classification-ECU.

Q: Is the DTC stored?
- YES: Diagnose the occupant classification-ECU (Refer to SRS CONTROL UNIT (SRS-ECU) ). Then go to Step 3.
- NO: Go to Step 3
STEP 3. Recheck for diagnostic trouble code.
Check again if the DTC is stored in the SRS-ECU.
1. Erase the DTC.
2. Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
3. Check if DTC is stored.
4. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC stored?
- YES: Replace the front seat cushion frame (RH) (Refer to DISASSEMBLY AND ASSEMBLY ) < Except RALLIART > or replace the slide adjuster (RH) (Refer to DISASSEMBLY AND ASSEMBLY ) < RALLIART >. Then go to Step 4.
- NO: There is an intermittent malfunction such as poor engaged connector(s) or open circuit (Refer to HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE POINTS ).
STEP 4. Recheck for diagnostic trouble code.
Check again if the DTC is stored in the SRS-ECU.
1. Erase the DTC.
2. Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
3. Check if DTC is stored.
4. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC stored?
- 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 USE TROUBLESHOOTING/INSPECTION SERVICE POINTS ).