Inspection Procedure 4: The SRS warning light does not go out: 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.

   Use scan tool MB991958 to diagnose the CAN bus lines.

   1. Connect scan tool MB991958 to the data link connector.
   2. Turn the ignition switch to the "ON" position.
   3. Diagnose the CAN bus line.

   Q: Is the check result satisfactory? 

   • 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 of the SRS warning light 
   1. Connect the negative battery terminal.
   2. Ignition switch: ON

   Q: Does the SRS warning light illuminate for approximately 7 seconds and then go out after the ignition switch is turned to the "ON" position? 

   • YES:  Go to Step 3.
   • NO:  There is an intermittent malfunction such as poor engaged connector(s) or open circuit (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
3. STEP 3. Using scan tool MB991958, check actuator test 

   Check the combination meter actuator tests. Item No. 07: Indicator 1

   Q: Does the SRS warning light turn on and off normally? 

   • YES:  Go to Step 4.
   • NO:  Replace the combination meter. (Refer to COMBINATION METER .).
4. STEP 4. Recheck for diagnostic trouble code. 

   Check again if the DTC is set.

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

   Q: Is DTC set? 

   • YES:  Troubleshoot for the relevant DTC.
   • NO:  Go to Step 5
5. STEP 5. Recheck of the SRS warning light 
   1. Connect the negative battery terminal.
   2. Ignition switch: ON

   Q: Does the light stay ON? 

   • YES:  Replace the SRS-ECU (Refer to SRS CONTROL UNIT (SRS-ECU)  ).
   • NO:  The procedure is complete.