Inspection Procedure 1: The theft-alarm is not armed (the theft-alarm indicator does not illuminate): Diagnosis

Required Special Tools: 

• MB992006: Extra fine probe
• MB991223: Harness set
• 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.
   1. Connect scan tool MB991958. Refer to "HOW TO CONNECT THE SCAN TOOL (M.U.T.-III)  ."
   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? 

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

     Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
2. STEP 2. Using scan tool MB991958, check for any diagnostic trouble code. 

   Check if DTC is set to the KOS-ECU < vehicles with KOS > or WCM < vehicles with WCM >.

   1. Turn the ignition switch to the "ON" position.
   2. Check whether the KOS or WCM related DTC is set.
   3. Turn the ignition switch to the "LOCK" (OFF) position.

   Q: Is the DTC set? 

   • YES < vehicles with KOS >  : Troubleshoot the KOS (Refer to DIAGNOSTIC TROUBLE CODE TABLE ).
   • YES < vehicles with WCM >  : Troubleshoot the WCM (Refer to DIAGNOSTIC TROUBLE CODE TABLE ).
   • NO:  Go to Step 3.
3. STEP 3. Check the keyless operation key < KOS > or keyless entry transmitter < WCM >. 

   Q: is the keyless operation key < KOS > or keyless entry transmitter < WCM > normally? 

   • YES:  Go to Step 4.
   • NO < vehicles with KOS >  : Troubleshoot the KOS (Refer to DIAGNOSTIC TROUBLE CODE TABLE ).
   • NO < vehicles with WCM >  : Troubleshoot the WCM (Refer to DIAGNOSTIC TROUBLE CODE TABLE ).
4. STEP 4. Using scan tool MB991958, check data list. 

   Use the ETACS-ECU data list to check the signals related to the theft-alarm function.

   • Turn the ignition switch to the "ACC" position.
   • Open each door.
   • Open the liftgate.

     Item No.	Item name	Normal condition
     Item 256	Dr door ajar switch	Open
     Item 257	Item 258	As door ajar switch RR door ajar switch Open Open
     Item 259	RL door ajar switch	Open
     Item 260	Trunk/gate trunk ajar switch	Open
     Item 264	Handle lock switch	Key in
     Item 288	ACC switch	ON

   • Close each door.
   • Close the liftgate.

     Item No.	Item name	Normal condition
     Item 256	Dr door ajar switch	Close
     Item 257	As door ajar switch	Close
     Item 258	RR door ajar switch	Close
     Item 259	RL door ajar switch	Close
     Item 260	Trunk/gate trunk ajar switch	Close

   • Turn the ignition switch to the "LOCK" (OFF) position (keep the ignition key < vehicles with WCM > or emergency key < vehicles with KOS > removed).

     Item No.	Item name	Normal condition
     Item 264	Handle lock switch	Key out
     Item 288	ACC switch	OFF

   Q: Does scan tool MB991958 display the items "Dr door ajar switch", "As door ajar switch", "RR door ajar switch", "RL door ajar switch", "Trunk/gate trunk ajar switch", "Handle lock switch" and "ACC switch" as normal condition? 

   • YES < Normal conditions are displayed for all items. >  : Go to Step 5.
   • NO < Normal condition is not displayed for item No. 256. >  : Troubleshoot the ETACS-ECU. Refer to INSPECTION PROCEDURE 5 "ETACS-ECU DOES NOT RECEIVE ANY SIGNAL FROM THE FRONT DOOR SWITCH (LH)" .
   • NO < Normal condition is not displayed for item No. 257. >  : Troubleshoot the ETACS-ECU. Refer to INSPECTION PROCEDURE 6 "ETACS-ECU DOES NOT RECEIVE ANY SIGNAL FROM THE FRONT DOOR SWITCH (RH)" .
   • NO < Normal condition is not displayed for item No. 258. >  : Troubleshoot the ETACS-ECU. Refer to INSPECTION PROCEDURE 7 "ETACS-ECU DOES NOT RECEIVE ANY SIGNAL FROM THE REAR DOOR SWITCH (LH)" .
   • NO < Normal condition is not displayed for item No. 259. >  : Troubleshoot the ETACS-ECU. Refer to INSPECTION PROCEDURE 8 "ETACS-ECU DOES NOT RECEIVE ANY SIGNAL FROM THE REAR DOOR SWITCH (RH)" .
   • NO < Normal condition is not displayed for item No. 260. >  : Troubleshoot the ETACS-ECU. Refer to INSPECTION PROCEDURE 9 "ETACS-ECU DOES NOT RECEIVE ANY SIGNAL FROM THE LIFTGATE SWITCH .
   • NO < Normal condition is not displayed for item No. 264. >  : Troubleshoot the ETACS-ECU. Refer to INSPECTION PROCEDURE 3 "ETACS-ECU DOES NOT RECEIVE ANY SIGNAL FROM KEY REMINDER SWITCH" .
   • NO < Normal condition is not displayed for item No. 288. >  : Troubleshoot the ETACS-ECU. Refer to INPUT SIGNAL PROCEDURE 1 "THE IGNITION SWITCH (ACC) SIGNAL IS NOT SENT TO THE ETACS-ECU" .
5. STEP 5. Check center panel unit connector C-18 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: Is center panel unit connector C-104 in good condition? 

   • YES:  Go to Step 6.
   • NO:  Repair the damaged parts.
6. STEP 6. Check the theft-alarm indicator. 

   Q: Is the theft-alarm indicator in good condition? 

   • YES:  Go to Step 7.
   • NO:  Replace the center panel unit.
7. STEP 7. Check ETACS-ECU connector C-317 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: Is the ETACS-ECU connector C-307 in good condition? 

   • YES:  Go to Step 8.
   • NO:  Repair the damaged parts.
8. STEP 8. Measure the voltage at ETACS-ECU connector C-307. 
   1. Disconnect ETACS-ECU connector C-307, and measure the voltage wiring harness side.
   2. Measure the voltage between ETACS-ECU connector-307 (terminal No. 2) and the body ground.
      • The voltage should measure approximately 12 volts (battery positive voltage).

   Q: Is the measured voltage approximately 12 volts (battery positive voltage)? 

   • YES:  Go to  Step 10.
   • NO:  Go to Step 9.
     Fig 2: Measuring Voltage Between ETACS-ECU Connector-307 (Terminal No. 2) And Body Ground

     Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
9. STEP 9. Check the Wiring harness between ETACS-ECU connector C-307 (terminal No. 2) and fusible link (36). 
   • Check the power supply line for open circuit and short circuit.

   Q: Is the check result normal? 

   • YES:  The trouble can be an intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
   • NO:  Repair the wiring harness between ETACS-ECU connector C-307 and fusible link (36).
10. STEP 10. Check ETACS-ECU connector C-317 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Is ETACS-ECU connector C-317 in good condition? 

    • YES:  Go to Step 11.
    • NO:  Repair the damaged parts.
11. STEP 11. Check the Wiring harness between ETACS-ECU connector C-317 (terminal No. 2, 9) and center panel unit connector C-104 (terminal No. 15, 12). 
    • Check the input/output lines for open circuit and short circuit.
    NOTE: Also check the joint connector C-07 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If the joint connector C-07 is damaged, repair or replace the connector. Refer to HARNESS CONNECTOR INSPECTION .

    Q: Is the check result normal? 

    • YES:  Go to Step 12.
    • NO:  Repair the wiring harness between ETACS-ECU connector C-317 and center panel unit connector C-104.
12. STEP 12. Retest the system. 

    Q: Does the theft-alarm work normally? 

    • YES:  The trouble can be an intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
    • NO:  Replace the ETACS-ECU.