Code No.U0231 RLS LIN timeout <Vehicles with lighting control sensor>


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

JUDGMENT CRITERIA


The ETACS-ECU will set diagnosis code No. U0231 when no signals are received from the lighting control sensor.

PROBABLE CAUSES



DIAGNOSIS PROCEDURE

STEP 1. Resistance measurement at the lighting control sensor connector
(1)Disconnect the connector, and measure at the wiring harness side.
(2)Measure the resistance between the lighting control sensor 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 lighting control sensor 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 lighting control sensor connector.
(1)Disconnect the connector, and measure at the wiring harness side.
(2)Measure the voltage between the lighting control sensor 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 BUP1 line between ETACS-ECU connector and lighting control sensor 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 lighting control sensor 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 lighting control sensor.
A poor connection, open circuit, or other intermittent malfunctions in the LIN bus lines between the lighting control sensor and the ETACS-ECU (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).