Symptom Related Diagnostic Procedures

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, check 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:

CIRCUIT OPERATION
Malfunctions of the sunroof motor assembly power supply/ground system, sunroof motor assembly, or sunroof switch are suspected.

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

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)."
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 Controller Area Network, 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.

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 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.
- 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 General (Electrical), 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 General (Electrical), 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.
- 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.

INSPECTION PROCEDURE 2: The Sunroof Lid Glass does not Tilt-up (Tilt-down, Open, 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

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.

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

Sunroof Switch Circuit:

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

Sunroof Switch Circuit:

2. Check continuity when the sunroof switch is operated to "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 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 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-05 (terminal 6) and sunroof motor assembly connector D-06 (terminal 10).

Q: Is the wiring harness between sunroof switch connector D-05 (terminal 6) and sunroof motor assembly connector D-06 (terminal No. 10) 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 down/close.

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 5: Sunroof Safety Function does not work Normally.

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

CIRCUIT OPERATION
Malfunction of the sunroof motor assembly or incorrect learning of the sunroof fully closed position is suspected.

TROUBLESHOOTING HINTS
- The sunroof motor assembly may be defective
- Incorrect learning of the sunroof fully closed position

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

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 "How to connect 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 Diagnostic trouble code chart.

NO : Go to Step 2.

STEP 2. Check the trouble symptom.
Check the sunroof trouble symptom according to the following procedures.

1. Carry out the learning procedures of the sunroof fully closed position.
2. Check the trouble symptom.

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 6: The Sunroof Timer Function does not work.

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

CIRCUIT OPERATION
- The sunroof timer function works according to the signals from the following switches:
- Ignition switch (IG1): OFF
- Front door switch (LH): OFF
- Front door switch (RH): OFF

- Vehicle condition
- Ignition switch: LOCK (OFF) position
- Front door (LH): Closed
- Front door (RH): Closed

- When the driver's door or the passenger's door are opened and closed while the sunroof timer function is on, the sunroof operative duration will be changed.

TECHNICAL DESCRIPTION (COMMENT)
Is the sunroof timer function does not work normally, the input circuits from the switches described in "CIRCUIT OPERATION", the sunroof motor assembly, the ETACS-ECU or the LIN communication line may be defective.

TROUBLESHOOTING HINTS
- The front door 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

STEP 1. Check the power supply system.
With the ignition switch in the LOCK (OFF) position, check if the following function operates normally:
- Hazard warning light
- Central door locking system

Q: Is the check result normal?

YES : Go to Step 2.

NO : Refer to Chassis Electrical - Malfunction of ETACS-ECU power supply circuit.

STEP 2. 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)."
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 Controller Area Network, CAN bus diagnostics table).

NO : Go to Step 3.

STEP 3. 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)."
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. Refer to Local Interconnect Network (LIN), Diagnostic trouble code chart.

NO : Go to Step 4.

STEP 4. Using scan tool MB991958, check data list.
Check the signals related to the sunroof timer function 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)."
2. Turn the ignition switch to the "ON" position.
3. Check the data list of the ETACS.
- Turn the ignition switch to the LOCK (OFF) position.
- Close the driver's door.
- Close the passenger's door.

4. Turn the ignition switch to the "LOCK" (OFF) position.

OK: Normal conditions are displayed for all the items.

Q: Are the check result normal?

YES ]Normal conditions are displayed for all the items.[ : Go to Step 5.

NO ]Normal condition is not displayed for item No. 254.[ : Refer to Chassis Electrical - inspection procedure 2: the ignition switch (IG1) signal is not received.

NO ]Normal condition is not displayed for item No. 256.[ : Refer to Chassis Electrical - inspection procedure 5: the front door switch (driver's side) signal is not received.

NO ]Normal condition is not displayed for item No. 257.[ : Refer to Chassis Electrical - inspection procedure 6: the front door switch (passenger's side) signal is not received.

STEP 5. Retest the system.
Check that the sunroof timer function works normally.

Q: Is the check result normal?

YES : No action is necessary and testing is complete.

NO : Replace the ETACS-ECU. Check that the sunroof timer function works normally.