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

Required Special Tool: 

• 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 the SRS-ECU connector E-08. 
   1. Disconnect SRS-ECU connector E-08.
   2. Check the short spring for the warning light inside the harness connector for improper contact or deformation.

   Q: Is SRS-ECU connectors E-08 good condition? 

   YES:  Then go to Step 2.

   NO:  Repair or replace the SRS-ECU connector E-08. Then go to  Step 4.

   Fig 1: Identifying Connector E-08 Terminals

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   Fig 2: Locating Short Spring For Warning Light

   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 D-04.
   3. Connect the negative battery cable.
   4. Turn the ignition switch to the "ON" position.
      Fig 3: Disconnecting Combination Meter Connector D-04

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

   Q: Does the SRS warning light go out when combination meter connector D-04 is disconnected? 

   YES:  Go to Step 3.

   NO:  Replace the combination meter. Then go to  Step 4.

   Fig 4: Locating SRS Warning Light

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
3. STEP 3. Check the harness for short circuit to ground between SRS-ECU connector E-08 (terminal No. 8) and combination meter connector D-04 (terminal No. 44). 

   Q: Is the harness wire between the SRS-ECU connector E-08 (terminal No. 8) and combination meter connector D-04 (terminal No. 44) 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 E-08 and combination meter connector D-04. Then go to Step 4.

   Fig 5: Identifying Connector E-08 Terminals

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   Fig 6: Identifying Combination Meter Connector D-04

   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 ).