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U0231




DTC U0231: Lighting control sensor LIN time-out [Vehicles with auto light function]

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


















TROUBLE JUDGMENT

The ETACS-ECU receives signal from the lighting control sensor. If signal cannot be received at all, DTC U0231 will be set.

TECHNICAL DESCRIPTION (COMMENT)

Current trouble

- Connector(s) or wiring harness in the LIN bus lines between the lighting control sensor and the ETACS-ECU, the power supply system of the lighting control sensor, or the lighting control sensor itself may be defective.
Past trouble

- If DTC U0231 is stored as a past trouble, carry out diagnosis with particular emphasis on wiring and connector(s) in the LIN bus line between the lighting control sensor and the ETACS-ECU, and the power supply system of the lighting control sensor.

TROUBLESHOOTING HINTS

- The lighting control sensor may be defective.
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

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)

STEP 1. Check ETACS-ECU connectors C-316, C-317 and lighting control sensor connector D-02 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q. Are ETACS-ECU connectors C-316, C-317 and lighting control sensor connector D-02 in good condition?

YES Go to Step 2.
NO Repair or replace the damaged component(s).
STEP 2. Check the ground circuit to the lighting control sensor. Measure the resistance at lighting control sensor connector D-02.

(1)Disconnect power window main switch connector D-02 and measure the resistance available at the wiring harness side of the connector.





(2)Measure the resistance value between power window main switch connector D-02 terminal 2 and ground.

- The resistance should be 2 ohms or less.

Q. Is the measured resistance 2 ohms or less?

YES Go to Step 4.

NO Go to Step 3.

STEP 3. Check the wiring harness between lighting control sensor connector D-02 (terminal 2) and the ground.

- Check the ground wires for open circuit.

Q. Is the wiring harness between lighting control sensor connector D-02 (terminal 2) and the ground in good condition?

YES No action is necessary and testing is complete.
NO The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary.
STEP 4. Check the battery power supply circuit to the lighting control sensor. Measure the voltage at lighting control sensor connector D-02.

(1)Disconnect lighting control sensor connector D-02 measure the voltage available at the wiring harness side of the connector.





(2)Measure the voltage between lighting control sensor connector D-02 terminal 1 and ground.

- The voltage should measure approximately 12 volts (battery positive voltage).

Q. Is the measured voltage approximately 12 volts (battery positive voltage)?

YES Go to Step 6.

NO Go to Step 5.

STEP 5. Check the wiring harness between ETACS-ECU connector C-317
(terminal 10) and lighting control sensor connector D-02 (terminal 1).

- Check the power supply line (battery supply) for open circuit and short circuit.

NOTE:
Also check intermediate connector C-133 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-133 is damaged, repair or replace the connector as described in Harness Connector Inspection Harness Connector Inspection.

Q. Is the wiring harness between ETACS-ECU connector C-317 (terminal 10) and lighting control sensor connector D-02 (terminal 1) in good condition?

YES No action is necessary and testing is complete.
NO The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary.
STEP 6. Check the wiring harness between ETACS-ECU connector C-316
(terminal 1) and lighting control sensor connector D-02 (terminal 3).

Check the communication line for open circuit.

Q. Is the wiring harness between ETACS-ECU connector C-316 (terminal 1) and lighting control sensor connector D-02 (terminal 3) in good condition?

YES Go to Step 7.
NO The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary.
STEP 7. Recheck for diagnostic trouble code.

Check again if the DTC is set to the ETACS-ECU.





(1)
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.

Connect scan tool MB991958. Refer to "How to connect the Scan Tool (M.U.T.-III) Reading and Clearing Diagnostic Trouble Codes."
(2)Erase the DTC.
(3)Turn the ignition switch to the "ON" position.
(4)Check if the DTC is set.
(5)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the DTC set?

YES Replace the lighting control sensor.

NO A poor connection, open circuit or other intermittent malfunction is present in the LIN bus lines between the lighting control sensor and the ETACS-ECU How to Cope With Intermittent Malfunctions).

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