U1511

DTC U1511: Sunroof Checksum Error [Vehicles With Sunroof]

TROUBLE JUDGMENT
The ETACS-ECU will set DTC U1511 when abnormal signals are received from the sunroof motor assembly (sunroof-ECU).

TROUBLESHOOTING HINTS
- The sunroof motor assembly may be defective.

DIAGNOSIS

Required Special Tools:
- 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)

Recheck for diagnostic trouble code.

Check again if the DTC is set to the ETACS-ECU.

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)." How to Connect the Scan Tool (M.U.T.-III)
2. Erase the DTC.
3. Turn the ignition switch to the "ON" position
4. Check if the DTC is set.
5. Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the DTC set?

YES : Replace the sunroof motor assembly.

NO : A poor connection, open circuit, or other intermittent malfunctions in the LIN bus lines between the sunroof motor assembly and the ETACS-ECU.