U1511
DTC U1511: Sunroof LIN checksum errorTROUBLE JUDGEMENT
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. Ensure that the ignition switch is at the "LOCK" (OFF) position.
2. Start up the personal computer.
3. Connect special tool MB991827 to special tool MB991824 and the personal computer.
4. Connect special tool MB991910 to special tool MB991824.
5. Connect special tool MB991910 to the data link connector.
6. Erase the DTC.
7. Turn the ignition switch to the "ON" position.
8. Check if the DTC is set.
9. 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 (Refer to general (Body and Chassis), How to Cope with Intermittent Malfunction).