Code No.U1109 Column SW LIN timeout

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



  • Faulty wiper and washer switch
  • Malfunction of the LIN bus


STEP 1. Connector check: C-301 ETACS-ECU connector, C-212 column switch connector

Q. Is the check result normal?

Go to Step 2.
Repair the defective connector.

STEP 2. Check the wiring harness wires between C-301 ETACS-ECU connector terminal No. 1 and C-212 column switch connector terminal No. 3.

Check the communication lines for open 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 "LOCK" (OFF) position to "ON" position.
(3)Check if diagnosis code is set.

Q. Is the diagnosis code set?

Replace the wiper/washer switch.
A poor connection, open circuit, or other intermittent malfunctions in the LIN bus lines between the column switch and the ETACS-ECU (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).