DTC 79: Left Hand Side-Airbag Module (Squib) System Fault 5 for Power Supply Circuit; DTC 93: Left Hand Side-Airbag Module (Squib) System Fault 6 for Communication System: 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 side impact sensor (LH) (Using scan tool MB991958, read the diagnostic trouble code). 
   1. Disconnect the negative battery terminal.
   2. Temporarily replace the side impact sensor (LH) with the side impact sensor (RH).
   3. Connect the negative battery terminal.
   4. Erase diagnostic trouble code memory, and then check the diagnostic trouble code.

   Q: Is DTC 89 or 96 set? 

   YES:  Replace the side impact sensor (LH) with a new one (Refer to SIDE IMPACT SENSOR  ). Then go to  Step 3.

   NO:  Go to Step 2.

2. STEP 2. Check the harness wires for open circuit or short circuit between SRS-ECU connector E-07 (terminal No. 34 and 36) and side impact sensor (LH) connector F-13 (terminal No. 1 and 2). 
   Fig 1: Identifying Connector E-07 Terminals

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   Fig 2: Identifying Side Impact Sensor (LH) Connector F-13

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   NOTE: After inspecting intermediate connector E-19 inspect the wiring harness. If the intermediate connector E-19 is damaged, repair or replace it (Refer to HARNESS CONNECTOR INSPECTION ). Then go to Step 3.

   Q: Are the harness wires between SRS-ECU connector E-07 (terminal No. 34 and 36) and side impact sensor (LH) connector F-13 (terminal No. 1 and 2) in good condition? 

   YES:  Erase the diagnostic trouble code memory, and check the diagnostic trouble code. If DTC 79 or 93 sets, replace the SRS-ECU (Refer to SRS CONTROL UNIT (SRS-ECU)  ). Then go to Step 3.

   NO:  Repair the harness wires between SRS-ECU connector E-07 and side impact sensor (LH) connector F-13. Then go to Step 3.

   Fig 3: Identifying Intermediate Connector E-19

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
3. STEP 3. Recheck for diagnostic trouble code. 

   Q: Is DTC 79 or 93 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 ).