Inspection Procedure E-4: Keyless Entry System: The Trunk Is Not Opened When The Keyless Entry Transmitter "Trunk" Button Is Operated.: Diagnosis

Required Special Tools: 

• MB991223: Harness Set
• MB991958: Scan Tool (MUT-III Sub Assembly)
  • MB991824: Vehicle Communication Interface (V.C.I.)
  • MB991827: MUT-III USB Cable
  • MB991910: MUT-III Main Harness A

1. STEP 1. Check that the doors can be locked and unlocked by using the keyless entry transmitter. 

   Q: Can the doors be locked and unlocked normally when the keyless entry transmitter is operated? 

   1. YES:  Go to Step 2.
   2. NO:  Refer to INSPECTION PROCEDURE E-1: KEYLESS ENTRY SYSTEM: KEYLESS ENTRY SYSTEM DOES NOT OPERATE .
2. STEP 2. Check the input signal (by using the pulse check mode of the monitor). 

   Check input signals from the transmitter.

   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. Operate scan tool MB991958 according to the procedure below to display "Pulse check."
      1. Select "Interactive Diagnosis."
      2. Select "System select."
      3. Select "SWS."
      4. Select "Pulse Checking."
   3. Push the transmitter "TRUNK" button.
   4. Check that scan tool MB991958 sounds

   Q: When the transmitter "TRUNK" button is turned ON, does scan tool MB991958 sound? 

   1. YES:  Go to Step 3.
   2. NO:  Refer to INSPECTION PROCEDURE N-8 "ETACS-ECU DOES NOT RECEIVE ANY SIGNAL FROM THE LOCK, UNLOCK, TRUNK OR PANIC SWITCH ."
      Fig 1: Connecting Special Tool MB991824 To Data Link Connector

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
3. STEP 3. Check trunk lid latch assembly connector F-05 and ETACS-ECU connector C-217 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: Is trunk lid latch assembly connector F-05 and ETACS-ECU connector C-217 in good condition? 

   1. YES:  Go to Step 4.
   2. NO:  Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION . Check that the headlights illuminate normally.
      Fig 2: Locating ETACS-ECU Connector C-217

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
      Fig 3: Locating Trunk Lid Latch Assembly Connector F-05

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
4. STEP 4. Check the trunk lid latch assembly. 

   Remove the trunk lid latch assembly.

   LEVER POSITION SPECIFIED CONDITION CHART
   
   

   LEVER POSITION	TESTER CONNECTION	SPECIFIED CONDITION
   ON (Latch open)	2 - Ground	Less than 2 ohms
   OFF (Latch shut)	2 - Ground	Open circuit

   Q: Does the windshield washer motor operate normally? 

   1. YES:  Go to Step 5.
   2. NO:  Replace the trunk lid latch assembly. Verify that the windshield washer works normally.
      Fig 4: Identifying Trunk Lid Latch Assembly

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
5. STEP 5. Check the wiring harness between trunk lid latch assembly connector F-05 (terminal 1) and ETACS-ECU connector C-217. 
   Fig 5: Locating ETACS-ECU Connector C-217

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   Fig 6: Locating Trunk Lid Latch Assembly Connector F-05

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   NOTE: Also check intermediate connector C-28 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-28 is damaged, repair or replace the damaged component(s) as described in HARNESS CONNECTOR INSPECTION .

   Q: Is the wiring harness between trunk lid latch assembly connector F-05 (terminal 1) and ETACS-ECU connector C-217 in good condition? 

   1. YES:  Replace the ETACS-ECU. All the doors can be locked or unlocked by means of the transmitter.
   2. NO:  The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. The system should communicate with the sunroof-ECU normally.
      Fig 7: Locating Intermediate Connector C-28

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.