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Home >> Mitsubishi >> 2014 >> Lancer ES Sportback >> Repair and Diagnosis >> Body & Frame >> Sun Roof/T-Top/Convertible Top >> Sunroof - With Diagnostics - Lancer >> Symptom Procedures >> INSPECTION PROCEDURE 1: Sunroof does not work at All >> Diagnostic Procedure

Diagnostic Procedure

Required Special Tools: 

  1. STEP 1. Using scan tool MB991958, read CAN bus 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) ."
    2. Turn the ignition switch to the "ON" position.
    3. Check whether the CAN bus lines related DTC is set.
    4. Turn the ignition switch to the "LOCK" (OFF) position.

    Q: Is the DTC set? 

    • YES:  Repair the CAN bus line (Refer to CAN BUS DIAGNOSTICS TABLE ).
    • NO:  Go to Step 2.
      Fig 1: Connecting Scan Tool MB991958
      G09627706
  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) ."
    2. Turn the ignition switch to the "ON" position.
    3. Check whether the sunroof motor assembly related DTC is set.
    4. Turn the ignition switch to the "LOCK" (OFF) position.

    Q: Is the DTC set? 

    • YES:  Diagnose the sunroof motor assembly. Refer to SUNROOF DIAGNOSIS  .
    • NO:  Go to Step 3.
      Fig 2: Connecting Scan Tool MB991958
      G09627706
  3. STEP 3. Check sunroof switch connector D-04 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Is sunroof switch connector D-04 in good condition? 

    • YES:  Go to Step 4.
    • NO:  Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION . Check that the sunroof works normally.
  4. STEP 4. Sunroof switch check 
    1. Remove the sunroof switch. Refer to SUNROOF  .
    2. Check continuity when the sunroof switch is operated to "OPEN", "TILT-UP" or "CLOSE/TILT-DOWN" position.
      Switch position Terminal No. Normal value
      Tilt-up 3 - 4 Continuity exists (2 Ω or less)
      OFF 3 - 4, 4 - 5, 4 - 6 Open circuit
      Open 4 - 5 Continuity exists (2 Ω or less)
      Close/tilt-down 4 - 6 Continuity exists (2 Ω or less)

    Q: Is the sunroof switch normal? 

    • YES:  Go to Step 5.
    • NO:  Replace the sunroof switch. Check that the sunroof works normally.
      Fig 3: Identifying Sunroof Switch Connectors Terminals
      G09627708
  5. STEP 5. Check the ground circuit to the sunroof motor assembly. Measure the resistance at sunroof switch connector D-04. 
    1. Disconnect sunroof switch connector D-04 and measure the resistance available at the wiring harness side of the connector.
    2. Measure the resistance value between terminal 4 and ground.
      • The resistance should be 2 Ω or less.

    Q: Is the measured resistance 2 Ω or less? 

    • YES:  Go to Step 6.
    • NO:  Go to  Step 8.
      Fig 4: Measuring Resistance Value Between Terminal 4 And Ground
      G09627709
  6. STEP 6. Check sunroof motor assembly connector D-05 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Is sunroof motor assembly connector D-05 in good condition? 

    • YES:  Go to Step 7.
    • NO:  Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION . Check that the sunroof works normally.
  7. STEP 7. Check the wiring harness between sunroof switch connector D-04 (terminal 4) and sunroof motor assembly connector D-05 (terminal 1). 

    Q: Is the wiring harness between sunroof switch connector D-04 (terminal 4) and sunroof motor assembly connector D-05 (terminal No. 1) in good condition? 

    • YES:  No action is necessary and testing is complete.
    • 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. Check that the sunroof works normally.
  8. STEP 8. Check sunroof motor assembly connector D-05 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Is sunroof motor assembly connector D-05 in good condition? 

    • YES:  Go to Step 9.
    • NO:  Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION . Check that the sunroof works normally.
  9. STEP 9. Check the ground circuit to the sunroof motor assembly. Measure the resistance at sunroof motor assembly connector D-05. 
    1. Disconnect sunroof motor assembly connector D-05 and measure the resistance available at the wiring harness side of the connector.
    2. Measure the resistance value between terminal 2 and ground.
      • The resistance should be 2 Ω or less.

    Q: Is the measured resistance 2 Ω or less? 

    • YES:  Go to  Step 11.
    • NO:  Go to Step 10.
      Fig 5: Measuring Resistance Value Between Terminal 2 And Ground
      G09627710
  10. STEP 10. Check the wiring harness between sunroof motor assembly connector D-05 (terminal 2) and ground. 

    Q: Is the wiring harness between sunroof motor assembly connector D-05 (terminal 2) and ground in good condition? 

    • YES:  No action is necessary and testing is complete.
    • 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. Check that the sunroof works normally.
  11. STEP 11. Check the fusible link (34) line of power supply circuit to the sunroof motor assembly. Measure the voltage at sunroof motor assembly connector D-05. 
    1. Disconnect sunroof motor assembly connector D-05 and measure the voltage available at the wiring harness side of the connector.
    2. Measure the voltage between terminal 6 and ground.
      • The voltage should measure approximately 12 V (battery positive voltage).

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

    • YES:  Go to  Step 13.
    • NO:  Go to Step 12.
      Fig 6: Measuring Voltage Between Terminal 6 And Ground
      G09627711
  12. STEP 12. Check the wiring harness between sunroof motor assembly connector D-05 (terminal 6) and fusible link (34). 
    NOTE: Also check ETACS-ECU connectors C-309 and C-316 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If ETACS-ECU connectors C-309 and C-316 is damaged, repair or replace the damaged component(s) as described in HARNESS CONNECTOR INSPECTION .

    Q: Is the wiring harness between sunroof motor assembly connector D-05 (terminal 6) and fusible link (34) in good condition? 

    • YES:  No action is necessary and testing is complete.
    • 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. Check that the sunroof works normally.
  13. STEP 13. Retest the system. 

    Check that the sunroof works normally.

    Q: Is the check result normal? 

    • YES:  No action is necessary and testing is complete.
    • NO:  Replace the sunroof motor assembly. Check that the sunroof works normally.
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