Inspection Procedure 8 [Vehicles With Lighting Control Sensor]
INSPECTION PROCEDURE 8: The rain sensitive AUTO wiper function works even though there is no rainfall [Vehicles with lighting control sensor].
CAUTION:
Whenever ECU is replaced, ensure that the input and output signal circuits are normal.
TECHNICAL DESCRIPTION (COMMENT)
The lighting control sensor, the harness connector, or the ETACS-ECU may be defective.
TROUBLESHOOTING HINTS
- Malfunction of the lighting control sensor
- Malfunction of ETACS-ECU
- Damaged wiring harness and connectors
DIAGNOSIS
Required Special Tools:
- MB991223: Harness Set
- MB992006: Extra Fine Probe
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A
STEP 1. Lighting control sensor installation surface check
Visually check the presence of scratches or air bubbles [diameter of 5 mm (0.20 in) 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 Removal and Replacement).
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 Inspection procedure 3 Inspection Procedure 3.
STEP 3. Use the scan tool MB991958 to check if an ETACS-related diagnostic trouble code is set.
Connect the scan tool. Reading and Clearing Diagnostic Trouble Codes."
Q. Is the diagnostic trouble code set?
YES Diagnose the ETACS-ECU. Electronic Time and Alarm Control System (ETACS)."
NO Go to Step 4.
STEP 4. Using scan tool MB991958, read the lighting control sensor diagnostic trouble code.
Check if a lighting control sensor diagnostic trouble code is set.
Connect the scan tool. Reading and Clearing Diagnostic Trouble Codes."
Q. Is the diagnostic trouble code set?
YES Diagnose the lighting control sensor. [Diagnostic Trouble Code: Headlight) or service data ( Scan Tool Testing and Procedures).]
NO Go to Step 5.
STEP 5. Connector check: C-316 ETACS-ECU connector
Q. Is the check result normal?
YES Go to Step 6.
NO Repair the damaged connector.
STEP 6. Measure the voltage at the C-316 ETACS-ECU connector.
(1)Disconnect the connector, and measure the voltage at the wiring harness side.
(2)Measure the voltage between C-316 ETACS-ECU connector terminal No. 1 and body ground.
OK: Battery positive voltage
Q. Is the check result normal?
YES Replace the Lighting control sensor.
NO Go to Step 7.
STEP 7. Check the wiring harness between C-316 ETACS-ECU connector terminal No.1 and D-02 lighting control sensor connector terminal No.3.
- Check the input and output lines for open or short circuit.
Q. Is the check result normal?
YES Intermittent malfunction How to Cope With Intermittent Malfunctions.)
NO Repair the wiring harness.