INSPECTION PROCEDURE 8: The Rain Sensitive AUTO Wiper Function Works Even Though There Is No Rainfall <Vehicles With Lighting Control Sensor>: Diagnosis
Required Special Tools:
- MB991223: Harness Set
- MB992006: Extra Fine Probe
- STEP 1. Lighting control sensor installation surface check
Visually check the presence of scratches or air bubbles [diameter of 5 mm (0.2 inch) or more] on the windshield to which the lighting control sensor is installed.
Q: Is the check result normal?
YES: Go to Step 2.
NO: Replace the windshield (Refer to REMOVAL AND INSTALLATION ).
- STEP 2. Windshield wiper operation check
Check that the windshield wipers work normally.
Q: Is the check result normal?
YES: Go to Step 3.
NO: Refer to TROUBLE SYMPTOM CHART .
- STEP 3. Using scan tool (M.U.T.-IIISE), read the ETACS-ECU DTC.
Check if DTC is set in the ETACS-ECU.
Q: Is the DTC set?
YES: Troubleshoot the ETACS (Refer to DIAGNOSTIC TROUBLE CODE CHART ).
NO: Go to Step 4.
- STEP 4. Using scan tool (M.U.T.-IIISE), read the lighting control sensor DTC.
Check if a lighting control sensor-related DTC is set in the LIN.
Q: Is the DTC set?
YES: Diagnose the lighting control sensor (Refer to DIAGNOSTIC TROUBLE CODE CHART ).
NO: Go to Step 5.
- STEP 5. Measure the voltage at ETACS-ECU connector (LIN2 terminal).
- Disconnect the connector, and measure the voltage at the wiring harness side.
- Measure the voltage between ETACS-ECU connector (LIN2 terminal) and body ground.
OK: Battery positive voltage
Q: Is the check result normal?
YES: Replace the Lighting control sensor.
NO: Go to Step 6.
- STEP 6. Check of short to power supply, short to ground, and open circuit in LIN2 line between ETACS-ECU connector and lighting control sensor connector.
Q: Is the check result normal?
YES: Intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTIONS ).
NO: Repair the connector(s) or wiring harness.