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



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

JUDGMENT CRITERIA




PROBABLE CAUSES



  • Faulty sunroof motor assembly
  • Malfunction of the LIN bus

DIAGNOSIS PROCEDURE


STEP 1. Resistance measurement at the sunroof motor assembly connector


(1)Disconnect the connector, and measure at the wiring harness side.
(2)Measure the resistance between the sunroof motor assembly connector (earth terminal) and the body earth.
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?

Go to Step 3.
Go to Step 2.

STEP 2. Check of open circuit in body earth line between sunroof motor assembly connector (earth terminal) and the body earth.


Q. Is the check result normal?

The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
Repair the connector(s) or wiring harness.

STEP 3. Voltage measurement at the sunroof motor assembly connector.


(1)Disconnect the connector, and measure at the wiring harness side.
(2)Measure the voltage between the sunroof motor assembly connector (power supply terminal) and the body earth.
OK: System voltage

Q. Is the check result normal?

Go to Step 5.
Go to Step 4.

STEP 4. Check of short to power supply, short to earth, and open circuit in SR+ line between ETACS-ECU connector and sunroof motor assembly connector.


Q. Is the check result normal?

The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
Repair the connector(s) or wiring harness.

STEP 5. Check of open circuit in (LIN2-1, LIN2-2 and LIN2-3) line between ETACS-ECU connector and sunroof motor assembly connector.


Q. Is the check result normal?

Go to Step 6.
Repair the connector(s) or wiring harness.

STEP 6. 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 ).