Inspection Procedure 5: Keyless entry system does not work: Diagnosis

Required Special Tools: 

• MB992006: Extra fine probe
• MB991223: Harness set
• MB991958 Scan Tool (M.U.T.-III Sub Assembly)
  • MB991824: Vehicles Communication Interface (V.C.I.)
  • MB991827 M.U.T.-III USB Cable
  • MB991910 M.U.T.-III Main Harness A

1. STEP 1. Using scan tool MB991958, check for CAN bus the diagnostic trouble code. 
   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) " .
      Fig 1: Connecting Special Tool MB991910 To Data Link Connector

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   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 ).

2. STEP 2. Using scan tool MB991958, read the diagnostic trouble code. 
   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) " .
      Fig 2: Connecting Special Tool MB991910 To Data Link Connector

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   2. Turn the ignition switch to the "ON" position.
   3. Check whether the WCM related DTC is set.
   4. Turn the ignition switch to the "LOCK" (OFF) position.

   Q: Is the DTC set? 

   YES  : Diagnose the WCM. Refer to DIAGNOSTIC TROUBLE CODE CHART  .

   NO  : Go to Step 3.

3. STEP 3. Check the power supply system 

   With the ignition switch in the LOCK (OFF) position, check if the following function operates normally:

   • Headlights
   • Hazard warning light

   Q: Is the check result normal? 

   YES  : Go to Step 4.

   NO  : Refer to MALFUNCTION OF ETACS-ECU POWER SUPPLY CIRCUIT .

4. STEP 4. Verify the central door locking system. 

   Check that the central door locking system works normally.

   Q: Is the check result normal? 

   YES  : Go to Step 5.

   NO  : Refer to TROUBLESHOOTING .

5. STEP 5. Using scan tool MB991958, check data list. 

   Check the signals related to the keyless entry system operation.

   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) " .
      Fig 3: Connecting Special Tool MB991910 To Data Link Connector

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   2. Turn the ignition switch to the "LOCK" (OFF) position.
   3. Check the ETACS data list.
      • Close the driver's door.
      • Close the passenger's door.
      • Close the RH-side rear door.
      • Close the LH-side rear door.
      • Close the trunk lid.
      • Remove the ignition key from the ignition key cylinder.
      ITEM NAME AND NORMAL CONDITION REFERENCE
      
      

      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
      Item 264	Handle lock switch	Key in → Key out

      OK: Normal condition are displayed. 

   Q: Are the check result normal? 

   YES < Normal conditions are displayed for all the items. > :  Go to Step 6.

   NO < Normal condition is not displayed for item No. 256. > :  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. > :  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. > :  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. > :  Refer to INSPECTION PROCEDURE 9: ETACS-ECU DOES NOT RECEIVE ANY SIGNAL FROM THE TRUNK LID LATCH. .

   NO < Normal condition is not displayed for item No. 264. > :  Refer to INSPECTION PROCEDURE 3: ETACS-ECU DOES NOT RECEIVE ANY SIGNAL FROM THE KEY REMINDER SWITCH. .

6. STEP 6. Using scan tool MB991958, check pulse check. 

   Check the signals related to the keyless entry system operation.

   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) " .
      Fig 4: Connecting Special Tool MB991910 To Data Link Connector

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   2. Confirm the ETACS pulse check.
      • Remove the ignition key from the ignition key cylinder.
        TRANSMITTER SWITCH CONDITIONS
        
        

        Item name	Conditions
        Transmitter switch	Turn the switch ON/OFF.

        OK: The scan tool (M.U.T.-III) tone alarm sounds. 

   Q: Is the check result normal? 

   YES  : Go to Step 7.

   NO  : Refer to "SIGNALS FROM TRANSMITTER SWITCHES ARE NOT RECEIVED. " .

7. STEP 7. Check reciever antenna assembly connector D-14 and WCM connector C-07 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: Is the reciever antenna assembly connector D-14 and WCM connector C-07 in good condition? 

   YES  : Go to Step 8.

   NO  : Repair the defective connector.

8. STEP 8. Check the wiring harness between the reciever antenna assembly connector D-14 (terminal Nos. 1, 3 and 5) and the WCM connector C-07 (terminal Nos. 1, 3 and 5) for open circuit. 
   1. Disconnect reciever antenna assembly connector D-14 and WCM connector C-07, and check the wiring harness.
   2. Check the wiring harness between reciever antenna assembly connector D-14 (terminal No.1) and WCM connector C-07 (terminal No.1).

      OK: Continuity exists (2 Ω or less) 

      Fig 5: Checking Wiring Harness Between reciever Antenna Terminal No 1 And WCM Terminal No 1

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   3. Check the wiring harness between reciever antenna assembly connector D-14 (terminal No.3) and WCM connector C-07 (terminal No.3).

      OK: Continuity exists (2 Ω or less) 

      Fig 6: Checking Wiring Harness Between reciever Antenna Terminal No 3 And WCM Terminal No 3

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   4. Check the wiring harness between reciever antenna assembly connector D-14 (terminal No.5) and WCM connector C-07 (terminal No.5).
      Fig 7: Checking Wiring Harness Between reciever Antenna Terminal No And WCM Terminal No 5

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

      OK: Continuity exists (2 Ω or less) 

   Q: Is the wiring harness between reciever antenna assembly connector D-14 (terminal Nos. 1, 3 and 5) and the WCM connector C-07 (terminal Nos. 1, 3 and 5) in good condition? 

   YES  : Go to Step 9.

   NO (reciever antenna assembly connector D-14 terminal No.1 - WCM connector C-07 terminal No.1.) :  Repair the wiring harness between reciever antenna assembly connector D-14 (terminal No.1) and WCM connector C-07 (terminal No.1).

   NO (reciever antenna assembly connector D-14 terminal No.3 - WCM connector C-07 terminal No.3.) :  Repair the wiring harness between reciever antenna assembly connector D-14 (terminal No.3) and WCM connector C-07 (terminal No.3).

   NO (reciever antenna assembly connector D-14 terminal No.5 - WCM connector C-07 terminal No.5.) :  Repair the wiring harness between reciever antenna assembly connector D-14 (terminal No.5) and WCM connector C-07 (terminal No.5).

9. STEP 9. Check the wiring harness between the reciever antenna assembly connector D-14 (terminal Nos. 1, 3 and 5) and the ground for short circuit. 
   1. Disconnect reciever antenna assembly connector D-14, and check the wiring harness.
   2. Check the wiring harness between reciever antenna assembly connector D-14 (terminal No.1) and ground

      OK: No continuity 

      Fig 8: Checking Wiring Harness Between reciever Antenna Connector D-14 Terminal No 1 And Ground

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   3. Check the wiring harness between reciever antenna assembly connector D-14 (terminal No.3) and ground

      OK: No continuity 

      Fig 9: Checking Wiring Harness Between reciever Antenna Connector D-14 Terminal No 3 And Ground

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   4. Check the wiring harness between reciever antenna assembly connector D-14 (terminal No.5) and ground
      Fig 10: Checking Wiring Harness Between reciever Antenna Connector D-14 Terminal No 5 And Ground

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

      OK: No continuity 

   Q: Is the wiring harness between reciever antenna assembly connector D-14 (terminal Nos. 1, 3 and 5) and the ground in good condition? 

   YES  : Go to Step 10.

   NO (reciever antenna assembly connector D-14 terminal No.1 - ground.) :  Repair the wiring harness between reciever antenna assembly connector D-14 (terminal No.1) and the ground.

   NO (reciever antenna assembly connector D-14 terminal No.3 - ground.) :  Repair the wiring harness between reciever antenna assembly connector D-14 (terminal No.3) and the ground.

   NO (reciever antenna assembly connector D-14 terminal No.5 - ground.) :  Repair the wiring harness between reciever antenna assembly connector D-14 (terminal No.5) and the ground.

10. STEP 10. Retest the system. 

    Replace the reciever antenna assembly. Check if the keyless entry system works normally.

    Q: Is the check result normal? 

    YES  : Intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).

    NO  : Replace WCM and register the ID codes (Refer to ID CODES REGISTRATION JUDGMENT TABLE  ).