Code No.U0169 Sunroof LIN timeout <Vehicles with sunroof>


caution Before replacing the ECU, ensure that the communication circuit is normal.








JUDGEMENT CRITERIA



PROBABLE CAUSES



  • Faulty sunroof motor assembly
  • Malfunction of the LIN bus

DIAGNOSIS PROCEDURE

STEP 1. Connector check: C-316 ETACS-ECU connector, D-06 sunroof motor assembly connector

Q. Is the check result normal?
Go to Step 2.
Repair the defective connector.

STEP 2. Check the wiring harness wires between C-316 ETACS-ECU connector terminal No. 1 and D-06 sunroof motor assembly connector terminal No. 7.
Check the communication lines for open circuit and short circuit.

Q. Is the check result normal?
Go to Step 3.
Repair the wiring harness.

STEP 3. Check whether the diagnosis code is reset.
Check again if the diagnosis code is set to the ETACS-ECU.
(1)Erase the diagnosis code.
(2)Turn the ignition switch from the LOCK (OFF) position to the ON position.
(3)Check if diagnosis code is set.

Q. Is the diagnosis code set?
Replace the sunroof motor assembly.
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 GROUP 00 - How to Cope with Intermittent Malfunction ).