INSPECTION PROCEDURE B-3: Tone Alarm: Seat belt tone alarm function does not work normally: Diagnosis

Required Special Tools: 

• MB991223: Harness Set
• MB992006: Extra Fine Probe
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
  • MB991824: V.C.I.
  • MB991827: M.U.T.-III USB Cable
  • MB991910: M.U.T.-III Main Harness A
• MB991813: SWS Monitor Kit
  • MB991806: SWS Monitor Cartridge
  • MB991812: SWS Monitor Harness (For Column-ECU)
  • MB991822: Probe Harness

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.
   1. Connect scan tool MB991958. Refer to "HOW TO CONNECT SWS MONITOR  ."
   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? 

   1. YES  : Go to Step 2.
   2. NO  : Repair the CAN bus line (Refer to DIAGNOSIS ).
   Fig 1: Scan Tool MB991958 Connection With Data Link Connector

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
2. STEP 2. Using scan tool MB991958, read the combination meter diagnostic trouble code. 

   Check whether the combination meter-related DTC is set.

   1. Turn the ignition switch to the "ON" position.
   2. Check whether the combination meter-related DTC is set.
   3. Turn the ignition switch to the "LOCK" (OFF) position.

   Q: Is the DTC set? 

   1. YES  : Diagnose the combination meter (Refer to DIAGNOSIS ).
   2. NO  : Go to Step 3.
   Fig 2: Scan Tool MB991958 Connection With Data Link Connector

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
3. STEP 3. Use scan tool MB991958 to select "ECU COMM Check" on the SWS monitor display. 

   Check the ETACS-ECU.

   CAUTION: Connect special tool MB991910 before connecting special tool MB991812. Be sure to connect special tool MB991806 after turning on special tool MB991824.
   1. Connect the SWS monitor. Refer to "HOW TO CONNECT SWS MONITOR  ."
   2. Turn the ignition switch to the "LOCK" (OFF) position.
   3. Operate scan tool MB991958 according to the procedure below to display "ECU COMM Check."
      1. Select "Interactive Diagnosis."
      2. Select "System Select."
      3. Select "SWS."
      4. Select "SWS MONITOR."
      5. Select "ECU COMM Check."
   4. Scan tool MB991958 should show "OK" on the "ECU COMM Check" menu for the "ETACS ECU" menu.
   Fig 3: Scan Tool MB991958 Connection With Data Link Connector

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

   Q: Is "OK" displayed for the "ETACS ECU" menu? 

   1. YES  : Go to Step 4.
   2. NO  : Refer to INSPECTION PROCEDURE A-3 "COMMUNICATION WITH THE ETACS-ECU IS NOT POSSIBLE  ."
   Fig 4: Special Tool MB991812 Connection With Column Switch Connector

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
4. STEP 4. Check the input signal by using "FUNCTION DIAG." menu of the SWS monitor. 

Check the input signals from the following switches:

• Ignition switch: OFF → ON
• Driver's seat belt: Unfastened
• All door: Closed

1. Operate scan tool MB991958 according to the procedure below to display "OTHER ALARM"
   1. Select "Interactive Diagnosis."
   2. Select "System Select."
   3. Select "SWS."
   4. Select "SWS MONITOR."
   5. Select "Function Diag."
   6. Select "BUZZER."
   7. Select "OTHER ALARM"
2. Check that normal conditions are displayed for the items described in the table below.

Fig 5: Scan Tool MB991958 Connection With Data Link Connector

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Fig 6: Special Tool MB991812 Connection With Column Switch Connector

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Q: Does scan tool MB991958 display the items "IG SW (IG1)" and "BUZZER" as normal condition? 

Normal conditions are displayed for all the items  : Replace the ETACS-ECU. When the ETACS-ECU is replaced, register the encrypted code. Refer to ENCRYPTED CODE REGISTRATION CRITERIA TABLE . Verify that the seat belt tone alarm function works normally.

Normal condition is not displayed for "IG SW (IG1)"  : Refer to INSPECTION PROCEDURE M-2 "ETACS-ECU DOES NOT RECEIVE ANY SIGNAL FROM THE IGNITION SWITCH (IG1)  ."

Normal condition is not displayed for "BUZZER"  : Replace the ETACS-ECU. When the ETACS-ECU is replaced, register the encrypted code. Refer to ENCRYPTED CODE REGISTRATION CRITERIA TABLE . Verify that the seat belt tone alarm function works normally.