Diagnostic Procedure

WARNING: This page is about a different car, the 2008 Mitsubishi Lancer. However, it is still accessible from the selected car via links, so may be relevant.

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

STEP 1. Using scan tool MB991958, read 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 SCAN TOOL (M.U.T.-III) ".
  
  Fig 1: Connecting Scan Tool To Data Link Connector
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
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.
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 SCAN TOOL (M.U.T.-III) ".
  
  Fig 2: Connecting Scan Tool To Data Link Connector
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
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 DIAGNOSTIC TROUBLE CODE CHART .

NO : Go to Step 3.
STEP 3. Check sunroof switch connector D-05 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Q: Is sunroof switch connector D-05 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.

STEP 4. Sunroof switch check

Remove the sunroof switch. Refer to SUNROOF .

Check continuity when the sunroof switch is operated to "OPEN", "TILT-UP" or "CLOSE/TILT-DOWN" position.

CONTINUITY CHART

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)

Fig 3: Identifying Sunroof Switch Connector Terminal

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Q: Is the sunroof switch normal?

YES : Go to Step 5.

NO : Replace the sunroof switch. Check that the sunroof works normally.

STEP 5. Check the ground circuit to the sunroof motor assembly. Measure the resistance at sunroof switch connector D-05.
1. Disconnect sunroof switch connector D-05 and measure the resistance available at the wiring harness side of the connector.
2. Measure the resistance value between terminal 4 and ground.
  
  Fig 4: Measuring Resistance Value Between Terminal 4 And Ground
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  - The resistance should be 2 ohms or less.
Q: Is the measured resistance 2 ohms or less?

YES : Go to Step 6.

NO : Go to Step 8.
STEP 6. Check sunroof motor assembly connector D-06 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Q: Is sunroof motor assembly connector D-06 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.
STEP 7. Check the wiring harness between sunroof switch connector D-05 (terminal 4) and sunroof motor assembly connector D-06 (terminal 1).
Q: Is the wiring harness between sunroof switch connector D-05 (terminal 4) and sunroof motor assembly connector D-06 (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.
STEP 8. Check sunroof motor assembly connector D-06 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Q: Is sunroof motor assembly connector D-06 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.
STEP 9. Check the ground circuit to the sunroof motor assembly. Measure the resistance at sunroof motor assembly connector D-06.
1. Disconnect sunroof motor assembly connector D-06 and measure the resistance available at the wiring harness side of the connector.
2. Measure the resistance value between terminal 2 and ground.
  
  Fig 5: Measuring Resistance Value Between Terminal 2 And Ground
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  - The resistance should be 2 ohms or less.
Q: Is the measured resistance 2 ohms or less?

YES : Go to Step 11.

NO : Go to Step 10.
STEP 10. Check the wiring harness between sunroof motor assembly connector D-06 (terminal 2) and ground.
Q: Is the wiring harness between sunroof motor assembly connector D-06 (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.
STEP 11. 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.