Part 2 of 2

INSPECTION PROCEDURE 6: The windshield intermittent wiper interval is not changed according to the vehicle speed.

Windshield Intermittent Wiper Control Circuit:

TECHNICAL DESCRIPTION (COMMENT)
If the intermittent wiper interval does not depend on the vehicle speed, the input circuit of the vehicle speed signal and the ETACS-ECU may be defective. Alternatively, the vehicle speed-dependent wiper may be set to "disabled" by using the configuration function.

TROUBLESHOOTING HINTS
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector
- The combination meter may be defective
- The ETACS-ECU may be defective

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. Retest the system.
Check that the windshield intermittent wiper interval can be adjusted by operating the windshield intermittent wiper interval control switch.

Q: Is the check result normal?

YES : Go to Step 2.

NO : Refer to Inspection Procedure 5 "The windshield intermittent wiper interval cannot be adjusted by operating the windshield intermittent wiper interval control switch"

STEP 2. Check the ETACS configuration function.
Use the ETACS configuration function to check that "Front wiper operation" is set to "Variable INT" or "Speed sensitive".

Q: Is the check result normal?

YES : Go to Step 3.

NO : Use the ETACS configuration function to set "Front wiper operation" to "variable INT" or "Speed sensitive".

STEP 3. Using scan tool MB991958, check data list.

Check the input signal related to the combination meter.
- Drive the vehicle and change vehicle speed.

Q: Is the check result normal?

YES : Go to Step 4.

NO ]Normal condition is not displayed for item No. 80.[ : Troubleshoot the speedometer (Refer to Chassis Electrical The combination meter, Diagnosis - Inspection Procedure 2: "The speedometer does not work (the other meters work).")

STEP 4. Retest the system.
Check that the intermittent wiper interval depends on the vehicle speed.

Q: Is the check result normal?

YES : Intermittent malfunction. Refer to General (Body and Chassis), How to cope with intermittent malfunction.

NO : Replace the ETACS-ECU.

INSPECTION PROCEDURE 7: The rain sensitive AUTO wiper function does not work at all ]Vehicles with lighting control sensor[.

CAUTION: Whenever ECU is replaced, ensure that the input and output signal circuits are normal.

Raindrops Sensing Wiper Function Control Circuit (Part 1):

Raindrops Sensing Wiper Function Control Circuit (Part 2):

CIRCUIT OPERATION
When the column switch is in the AUTO position, this function automatically adjusts the wiping speed of windshield wiper by detecting the rain fall through lighting control sensor.

TECHNICAL DESCRIPTION (COMMENT)
The windshield wiper motor, the column switch, the lighting control sensor, the harness connector, or the ETACS-ECU may be defective.

TROUBLESHOOTING HINTS
- Defective column switch (column-ECU)
- Malfunction of the lighting control sensor
- Defective windshield wiper motor
- 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 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 Body - Windshield 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. Use the scan tool MB991958 to check if an ETACS-related diagnostic trouble code is set.

2. Measure the resistance between D-02 lighting control sensor connector terminal No.2 and body ground.

OK: Continuity exists (2 Ohms or less)

Q: Is the check result normal?

YES : Go to Step 8.

NO : Go to Step 7.

STEP 7. Check the wiring harness between D-02 lighting control sensor connector terminal No.2 and body ground.
- Check the ground wires for open circuit.

Q: Is the check result normal?

YES : Intermittent malfunction (Refer to General (Body and Chassis) - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction.)

NO : Repair the wiring harness.

STEP 8. Voltage measurement at the D-02 lighting control sensor connector

1. Disconnect the connector, and measure the voltage at the wiring harness side.

2. Measure the voltage between D-02 lighting control sensor connector terminal No.1 and body ground.

OK: Battery voltage

Q: Is the check result normal?

YES : Go to Step 10.

NO : Go to Step 9.

STEP 9. Check the wiring harness between D-02 lighting control sensor connector terminal No.1 and fusible link (36).

NOTE: Prior to the wiring harness inspection, check intermediate connector C-133, ETACS-ECU connectors C-307 and C-317, and repair if necessary.

- Check the power supply line for open circuit.

Q: Is the check result normal?

YES : Intermittent malfunction (Refer to General (Body and Chassis) - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction.)

NO : Repair the wiring harness.

STEP 10. Connector check: C-316 ETACS-ECU connector

Q: Is the check result normal?

YES : Go to Step 11.

NO : Repair the damaged connector.

STEP 11. Measure the voltage at the C-316 ETACS-ECU connector.

1. Disconnect the connector, and measure the voltage at the wiring harness side.

Raindrops Sensing Wiper Function Control Circuit:

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 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 Body - Windshield 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 Inspection procedure 3.

STEP 3. Use the scan tool MB991958 to check if an ETACS-related diagnostic trouble code is set.

2. Measure the voltage between C-316 ETACS-ECU connector terminal No. 1 and body ground.

OK: Battery 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 (Refer to General (Body and Chassis) - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction.)

NO : Repair the wiring harness.

INSPECTION PROCEDURE 9: Sometimes 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 may be defective or a failure in the lighting control sensor (rain sensor) adaptation is suspected.

TROUBLESHOOTING HINTS
- Malfunction of the lighting control sensor
- Lighting control sensor (rain sensor) adaptation failure

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 (rain sensor) installation surface check
Visually check the presence of scratches or air bubbles (diameter of 5 mm 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 Body - Windshield 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 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. Refer to Chassis Electrical ETACS, "How to connect the scan tool (M.U.T.-III)."

Q: Is the diagnostic trouble code set?

YES : Diagnose the ETACS-ECU. Refer to Chassis Electrical ETACS, "Diagnostic trouble code chart."

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. Refer to Chassis Electrical ETACS, "How to connect the scan tool (M.U.T.-III)."

Q: Is the diagnostic trouble code set?

YES : Diagnose the lighting control sensor. [Diagnosis Code: (Refer to Chassis Electrical - Diagnosis Code Chart) or service data.] Scan Tool Testing and Procedures

NO : Go to Step 5.

STEP 5. Lighting control sensor (rain sensor) installation surface check
Check that the lighting control sensor (rain sensor) is installed to the windshield glass firmly.

Q: Is the check result normal?

YES : Go to Step 6 after completion of the lighting control sensor (rain sensor) adaptation.

NO : Install the lighting control sensor (rain sensor) to the windshield glass correctly (Refer to Chassis Electrical - Lighting control sensor removal and Installation).

STEP 6. Retest the system.
Check the lighting control sensor (rain sensor) after completion of the lighting control sensor (rain sensor) adaptation

1. Check that the windshield glass surface is dry.
2. Pour the windshield glass surface where the lighting control sensor is installed.

Q: Does the windshield wiper operate?

Operate one or more : Intermittent malfunction (Refer to General (Body and Chassis) - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction).

Does not operate : Troubleshoot the rain sensitive wiper function (Refer to Inspection procedure 7).

INSPECTION PROCEDURE 10: The windshield washer does not work normally.

Windshield Washer Motor Circuit (Part 1):

Windshield Washer Motor Circuit (Part 2):

CIRCUIT OPERATION
The windshield washer switch sends a signal through the column-ECU (incorporated in the column switch) to the ETACS-ECU. If the column-ECU sends a windshield washer switch "ON" signal to the ETACS-ECU, the ETACS-ECU turns on the relay (incorporated in the ETACS-ECU), thus causing the washer motor to be turned on.

TECHNICAL DESCRIPTION (COMMENT)
If the windshield washer does not work normally, the washer motor, the column switch (windshield wiper and washer switch) or the ETACS-ECU may be defective.

TROUBLESHOOTING HINTS
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector
- The washer motor may be defective
- The column switch may be defective
- The ETACS-ECU may be defective

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. Verify the windshield wiper operation.

Q: Does the windshield wiper operate normally?

YES : Go to Step 2.

NO : Refer to Inspection Procedure 1 "The windshield wipers do not work at all."

STEP 2. Use the scan tool MB991958 to check if an ETACS-related diagnostic trouble code is set.

OK: Normal condition is displayed.

Q: Is the check result normal?

NO : Go to Step 4.

YES : Refer to Chassis Electrical - ETACS, Input signal chart.

STEP 4. Check windshield washer motor connector D-20 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is windshield washer motor connector D-20 in good condition?

YES : Go to Step 5.

NO : Repair or replace the damaged component(s). Refer to General (Electrical), Harness Connector Inspection. Verify that the windshield wiper works normally.

STEP 5. Check the operation of windshield washer motor.

1. Disconnect windshield washer motor connector D-20 and check at windshield washer motor connector side.
2. Fill the windshield washer tank with washer fluid.

3. When battery voltage is applied between terminals 1 and 2, washer fluid should spray out.

Q: Does the washer motor operate normally?

YES : Go to Step 6.

NO : Replace the washer motor. Verify that the windshield washer works normally.

STEP 6. Check ETACS-ECU connector C-304 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is ETACS-ECU connector C-304 in good condition?

YES : Go to Step 7.

NO : Repair or replace the damaged component(s). Refer to General (Electrical), Harness Connector Inspection. Verify that the windshield washer works normally.

STEP 7. Measure the voltage at ETACS-ECU connector C-304.

1. Disconnect ETACS-ECU connector C-304 and measure the resistance available at the wiring harness side of the connector.
2. Ignition switch: ACC
3. windshield washer switch: ON

4. Measure the voltage between C-304 ETACS-ECU connector terminal No. 13 and body ground.

OK: Battery voltage

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

YES : Go to Step 10.

NO : Go to Step 8.

STEP 8. Check the wiring harness between windshield washer motor connector D-20 (terminal 2) and ETACS-ECU connector C-304 (terminal 13).
- Check the input lines for open or short circuit.

Q: Is the wiring harness between windshield washer motor connector D-20 (terminal 2) and ETACS-ECU connector C-304 (terminal 13) in good condition?

YES : Go to Step 9.

NO : Repair or replace the damaged component(s). Refer to General (Electrical), Cables and wire check.

STEP 9. Check the wiring harness between windshield washer motor connector D-20 (terminal 1) and ETACS-ECU connector C-304 (terminal 14).

NOTE: Prior to the wiring harness inspection, check intermediate connector C-47 and repair if necessary.

- Check the input lines for open or short circuit.

Q: Is the wiring harness between windshield washer motor connector D-20 (terminal 1) and ETACS-ECU connector C-304 (terminal 14) in good condition?

YES : Go to Step 10.

NO : Repair or replace the damaged component(s). Refer to General (Electrical), Cables and wire check.

STEP 10. Retest the system.
Check that the windshield washers work normally.

Q: Is the check result normal?

YES : Intermittent malfunction. Refer to General (Body and Chassis), How to cope with intermittent malfunction.

NO : Replace the ETACS-ECU.