Part 2 of 2

INSPECTION PROCEDURE 5: The windshield intermittent wiper interval cannot be adjusted by operating the windshield intermittent wiper volume control switch.

Windshield Intermittent Wiper Control Circuit:

TECHNICAL DESCRIPTION (COMMENT)
If the windshield intermittent wiper interval is not changed by operating the windshield intermittent wiper interval adjusting knob or according to the vehicle speed, the column switch or the ETACS-ECU may be defective.

TROUBLESHOOTING HINTS
- Trouble in input signal system
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector
- 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. 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, "Diagnostic function."

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 2.

STEP 2. Check the ETACS configuration function.
Use the ETACS configuration function to check that "Front wiper operation" is set to "variable INT" or "vehicle speed dependent".

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 "vehicle speed dependent".

STEP 3. Retest the system.
Check that the windshield wiper interval changes when the windshield wiper volume control is rotated.

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 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 CAN bus line 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 volume 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 volume control switch".

STEP 2. Check the ETACS configuration function.
Use the ETACS configuration function to confirm that "Front wiper operation" is set to "Vehicle speed dependent".

Q: Is the check result normal?

YES : Go to Step 3.

NO : Use the ETACS configuration function to set "Front wiper operation" to "Vehicle speed dependent".

STEP 3. Use the scan tool MB991958 to diagnose the CAN bus lines.

Connect the scan tool. Refer to Chassis Electrical ETACS, "Diagnostic function."

Q: Is the check result normal?

YES : Go to Step 4.

NO : Repair the CAN bus line (Refer to Controller Area Network- CAN bus diagnosis chart).

STEP 4. Use the scan tool MB991958 to diagnose other system diagnostic trouble code
Connect the scan tool. Refer to Chassis Electrical ETACS, "Diagnostic function." Check that the TCM sets a diagnostic trouble code.

Q: Is the diagnostic trouble code set?

YES : Diagnose the TCM (Refer to A/T- Diagnostic trouble code chart).

NO : Go to Step 5.

STEP 5. 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 windshield washer does not work.

Windshield Washer Motor Circuit:

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 procedures.

STEP 4. Check windshield washer motor connector A-54 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is windshield washer motor connector A-54 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 A-54 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 the operation of rear washer.
Check that rear washer works.

Q: Does the rear washer operate normally?

YES : Go to Step 7.

NO : Replace the ETACS-ECU.

STEP 7. 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 8.

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

STEP 8. Check the wiring harness between windshield washer motor connector A-54 (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 A-54 (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 A-54 (terminal 1) and ETACS-ECU connector C-304 (terminal 14).
- Check the input lines for open or short circuit.

Q: Is the wiring harness between windshield washer motor connector A-54 (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.