DTC 43: SRS Warning Light Drive Circuit System Fault 1 (Light does not Switch Off).: Diagnosis

Required Special Tools: 

• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: MUT-III USB Cable
• MB991911: MUT-III Main Harness B (Vehicles without CAN communication system)

1. STEP 1. Check SRS-ECU connector C-12 for damage. 
   1. Disconnect SRS-ECU connector C-12.
      Fig 1: Identifying SRS-ECU Connector C-12

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   2. Check the short spring for warning light inside the harness connector for improper contact or deformation.

   Q: Is SRS-ECU connector C-12 in good condition? 

   • YES:  Then go to Step 2.
   • NO:  Repair or replace the SRS-ECU connector C-12 (Refer to SRS CONTROL UNIT (SRS-ECU)  .) Then go to  Step 4.
     Fig 2: Identifying Harness Connector C-12

     Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
2. STEP 2. Check the SRS warning light. 
   1. Disconnect the negative battery cable.
   2. Disconnect the combination meter connector C-02.
   3. Connect the negative battery cable.
   4. Turn the ignition switch to the "ON" position.

   Q: Does the SRS warning light go out? 

   • YES:  Go to Step 3.
   • NO:  Replace the combination meter (Refer to COMBINATION METER ASSEMBLY .) Then go to  Step 4.
     Fig 3: Identifying Harness Connector C-02

     Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
3. STEP 3. Check the harness for short circuit to ground between SRS-ECU connector C-12 (terminal No.8) and combination meter connector C-02 (terminal No.36.) 

   Q: Is the harness wire between the SRS-ECU connector C-12 (terminal No.8) and combination meter connector C-02 (terminal No.36) in good condition? 

   • YES:  Erase the diagnostic trouble code memory, and check the diagnostic trouble code. If DTC 43 sets, replace the SRS-ECU (Refer to SRS CONTROL UNIT (SRS-ECU)  .) Then go to Step 4.
   • NO:  Repair the harness wire between SRS-ECU connector C-12 and combination meter connector C-02. Then go to Step 4.
     Fig 4: Identifying Harness SRS-ECU Connector C-12

     Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
     Fig 5: Identifying Harness Connector C-02

     Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
4. STEP 4. Recheck for diagnostic trouble code. 

   Q: Is DTC 43 set? 

   • YES:  Return to  Step 1.
   • NO:  The procedure is complete (If no malfunctions are found in all steps, an intermittent malfunction is suspected. Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .)