Part 1 of 2

TROUBLE SYMPTOM CHART

CAUTION: During diagnosis, a diagnostic trouble code associated with other system may be set when the ignition switch is turned on with connector(s) disconnected. On completion, confirm all systems for diagnostic trouble code(s). If diagnostic trouble code(s) are set, erase them all.

Trouble Symptom Chart:

SYMPTOM PROCEDURES

INSPECTION PROCEDURE 1: Sunroof does not Work at All.

CAUTION: Before replacing the ECU, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.

Sunroof Motor Assembly Power Supply Circuit (Part 1):

Sunroof Motor Assembly Power Supply Circuit (Part 2):

CIRCUIT OPERATION
- The sunroof motor assembly is energized through fusible link (34) by the battery.
- When the ignition switch (IG1) signal is on, the sunroof motor assembly is ready to operate.

TROUBLESHOOTING HINTS
- The sunroof switch may be defective.
- The sunroof motor assembly may be defective.
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

DIAGNOSTIC PROCEDURE

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 (Vehicles with CAN communication system)

STEP 1. 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 Keyless Operation System (KOS), "How to connect scan tool (M.U.T.-III)." How To Connect The Scan Tool (M.U.T.-III)
2. Turn the ignition switch to the "ON" position.
3. Check whether the ETACS-ECU related DTC is set.
4. Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the DTC set?

YES : Diagnose the ETACS-ECU.

NO : Go to Step 2.

STEP 2. Check sunroof switch connector D-03 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is sunroof switch connector D-03 in good condition?

YES : Go to Step 3.

NO : Repair or replace the damaged component(s). Refer to General (Electrical), Harness Connector Inspection. Check that the sunroof works normally.

STEP 3. Sunroof switch check
1. Remove the sunroof switch.






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






Q: Is the sunroof switch normal?

YES : Go to Step 4.

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

STEP 4. Check the ground circuit to the sunroof motor assembly. Measure the resistance at sunroof switch connector D-03.
1. Disconnect sunroof switch connector D-03 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 ohms or less.

Q: Is the measured resistance 2 ohms or less?

YES : Go to Step 5.

NO : Go to Step 7.

STEP 5. Check sunroof motor assembly connector D-04 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

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

YES : Go to Step 6.

NO : Repair or replace the damaged component(s). Refer to General (Electrical), Harness Connector Inspection. Check that the sunroof works normally.

STEP 6. Check the wiring harness between sunroof switch connector D-03 (terminal No. 4) and sunroof motor assembly connector D-04 (terminal No. 1).

Q: Is the wiring harness between sunroof switch connector D-03 (terminal 4) and sunroof motor assembly connector D-04 (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 7. Check sunroof motor assembly connector D-04 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

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

YES : Go to Step 8.

NO : Repair or replace the damaged component(s). Refer to General (Electrical), Harness Connector Inspection. Check that the sunroof works normally.

STEP 8. Check the ground circuit to the sunroof motor assembly. Measure the resistance at sunroof motor assembly connector D-04.
1. Disconnect sunroof motor assembly connector D-04 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 ohms or less.

Q: Is the measured resistance 2 ohms or less?

YES : Go to Step 10.

NO : Go to Step 9.

STEP 9. Check the wiring harness between sunroof motor assembly connector D-04 (terminal 2) and ground.

Q: Is the wiring harness between sunroof motor assembly connector D-04 (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 10. Check the fusible link (34) line of power supply circuit to the sunroof motor assembly. Measure the voltage at sunroof motor assembly connector D-04.
1. Disconnect sunroof motor assembly connector D-04 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 volts (battery positive voltage).

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

YES : Go to Step 12.

NO : Go to Step 11.

STEP 11. Check the wiring harness between sunroof motor assembly connector D-04 (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 General (Electrical), Harness Connector Inspection.

Q: Is the wiring harness between sunroof motor assembly connector D-04 (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.

STEP 12. Check the ignition switch (IG1) circuit to the sunroof motor assembly. Measure the voltage at sunroof motor assembly connector D-04.
1. Disconnect sunroof motor assembly connector D-04 and measure the voltage available at the wiring harness side of the connector.
2. Turn the ignition switch to the "ON" position.






3. Measure the voltage between terminal 3 and 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 14.

NO : Go to Step 13.

STEP 13. Check the wiring harness between sunroof motor assembly connector D-04 (terminal 3) and ignition switch (IG1).

NOTE: Also check intermediate connector C-36 and ETACS-ECU connector C-317 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-36 and ETACS-ECU connector C-317 is damaged, repair or replace the damaged component(s) as described in General (Electrical), Harness Connector Inspection.

Q: Is the wiring harness between sunroof motor assembly connector D-04 (terminal 3) and the ignition switch (IG1) 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 14. 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.

INSPECTION PROCEDURE 2: The Sunroof Lid Glass does not Tilt-up (Open, Tilt-down and Close Normally).

CAUTION: Before replacing the ECU, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.

Sunroof Switch Circuit:

TECHNICAL DESCRIPTION (COMMENT)
The sunroof switch or the sunroof motor assembly may be defective.

TROUBLESHOOTING HINTS
- The sunroof switch may be defective
- The sunroof motor assembly may be defective
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector

DIAGNOSTIC PROCEDURE

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 (Vehicles with CAN communication system)

STEP 1. 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 Keyless Operation System (KOS), "How to connect scan tool (M.U.T.-III)." How To Connect The Scan Tool (M.U.T.-III)
2. Turn the ignition switch to the "ON" position.
3. Check whether the ETACS-ECU related DTC is set.
4. Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the DTC set?

YES : Diagnose the ETACS-ECU.

NO : Go to Step 2.

STEP 2. Check sunroof switch connector D-03 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is sunroof switch connector D-03 in good condition?

YES : Go to Step 3.

NO : Repair or replace the damaged component(s). Refer to General (Electrical), Harness Connector Inspection. Check that the sunroof works normally.

STEP 3. Sunroof switch check
1. Remove the sunroof switch.






2. Check continuity when the sunroof switch is operated to "TILT-UP" position.






Q: Is the sunroof switch normal?

YES : Go to Step 4.

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

STEP 4. Check sunroof motor assembly connector D-04 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

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

YES : Go to Step 5.

NO : Repair or replace the damaged component(s). Refer to General (Electrical), Harness Connector Inspection. Check that the sunroof works normally.

STEP 5. Check the wiring harness between sunroof switch connector D-03 (terminal 3) and sunroof motor assembly connector D-04 (terminal 4).

Q: Is the wiring harness between sunroof switch connector D-03 (terminal 3) and sunroof motor assembly connector D-04 (terminal No. 4) in good condition?

YES : Go to Step 6.

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 6. Retest the system.
Check that the sunroof lid glass tilts up.

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.

INSPECTION PROCEDURE 3: The Sunroof Lid Glass does not Open (Tilt-up, Tilt-down and Close Normally).

CAUTION: Before replacing the ECU, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.

Sunroof Switch Circuit:

TECHNICAL DESCRIPTION (COMMENT)
The sunroof switch or the sunroof motor assembly may be defective.

TROUBLESHOOTING HINTS
- The sunroof switch may be defective
- The sunroof motor assembly may be defective
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector

DIAGNOSTIC PROCEDURE

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 (Vehicles with CAN communication system)

STEP 1. 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 Keyless Operation System (KOS), "How to connect scan tool (M.U.T.-III)." How To Connect The Scan Tool (M.U.T.-III)
2. Turn the ignition switch to the "ON" position.
3. Check whether the ETACS-ECU related DTC is set.
4. Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the DTC set?

YES : Diagnose the ETACS-ECU.

NO : Go to Step 2.

STEP 2. Check sunroof switch connector D-03 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is sunroof switch connector D-03 in good condition?

YES : Go to Step 3.

NO : Repair or replace the damaged component(s). Refer to General (Electrical), Harness Connector Inspection. Check that the sunroof works normally.

STEP 3. Sunroof switch check
1. Remove the sunroof switch.






2. Check continuity when the sunroof switch is operated to "OPEN" position.






Q: Is the sunroof switch normal?

YES : Go to Step 4.

NO : Replace the sunroof switch.

STEP 4. Check sunroof motor assembly connector D-04 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

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

YES : Go to Step 5.

NO : Repair or replace the damaged component(s). Refer to General (Electrical), Harness Connector Inspection. Check that the sunroof works normally.

STEP 5. Check the wiring harness between sunroof switch connector D-03 (terminal 5) and sunroof motor assembly connector D-04 (terminal 5).

Q: Is the wiring harness between sunroof switch connector D-03 (terminal 5) and sunroof motor assembly connector D-04 (terminal No. 5) in good condition?

YES : Go to Step 6.

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 6. Retest the system.
Check that the sunroof lid glass opens.

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.