Inspection Procedure G-3

Windshield Wiper and Washer: Any of the Windshield Wiper Switch Positions is Defective.

NOTE: This troubleshooting requires use of scan tool MB991958 and SWS monitor kit MB991862. For details of how to use the SWS monitor, refer to "How to use SWS monitor." How To Use SWS Monitor

Windshield Wiper Automatic Stop Relay Circuit:

TECHNICAL DESCRIPTION (COMMENT)
If either of the windshield wiper switch positions is defective, the windshield wiper motor, column switch (windshield wiper and washer switch) or the front-ECU may be defective.

TROUBLESHOOTING HINTS
- Malfunction of the wiper motor
- Malfunction of the column switch (windshield wiper and washer switch)
- Malfunction of the front-ECU
- Damaged harness wires and connectors

DIAGNOSIS

Required Special Tools:
- MB991223: Harness Set
- MB991958: Scan Tool (MUT-III Sub Assembly)
- MB991824: Vehicles communication interface
- MB991827: MUT-III USB cable
- MB991911: MUT-III Main harness B
- MB991813: SWS monitor kit
- MB991806: SWS monitor cartridge
- MB991812: SWS monitor harness (for column-ECU)
- MB991922: Probe harness

STEP 1. Check the input signal by using "DATA LIST" of the SWS monitor.
Turn the ignition switch to the ACC position before checking input signals from the windshield wiper switch.

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 special tool MB991911 before connecting special tool MB991812. Be sure to connect special tool MB991806 after turning on special tool MB991824.







1. Connect the special tool. Refer to "How to connect SWS monitor." How to Connect SWS Monitor
2. Operate scan tool MB991958 according to the procedure below to display "COLUMN ECU."
a. Select "Interactive Diagnosis."
b. Select "System select."
c. Select "SWS."
d. Select "SWS MONITOR."
e. Select "Data List."
f. Select "COLUMN ECU."




3. Check that normal conditions are displayed on the items described in the given table.

Q: Are normal conditions displayed for "INT WIPER SW", "LO WIPER SW", "HI WIPER SW" and "MIST WIPER SW"?

YES: Go to Step 2.

NO: Refer to Inspection Procedure O-8 "ETACS-ECU does not receive a signal from the windshield mist switch."

STEP 2. Check the windshield wiper motor.




1. Disconnect windshield wiper motor connector A-03.
2. Connect a battery to the windshield wiper motor as shown.
Then check the windshield wiper motor operates normally at high and low speeds.

Q: Does the windshield wiper motor operate normally?

YES: Go to Step 3.

NO: Replace the windshield wiper motor. Check that the windshield wiper operates normally when the windshield wiper switch is moved to each position.







STEP 3. Check windshield wiper motor connector A-03 and front-ECU connector A-11X for damage.

Q: Are windshield wiper motor connector A-03 and front-ECU connector A-11X in good condition?

YES: Go to Step 4.

NO: Repair or replace the connector. Refer to Harness Connector Inspection. Check that the windshield wiper operates normally when the windshield wiper switch is moved to each position.










STEP 4. Check the wiring harness between windshield wiper motor connector A-03 (terminals 3 and 4 ) and front-ECU connector A-11X (terminals 27 and 28 ).

NOTE: Also check intermediate connector C-06. If intermediate connectors C-06 is damaged, repair or replace the connector as described in Harness Connector Inspection.

Q: Is the wiring harness between windshield wiper motor connector A-03 (terminals 3 and 4 ) and front-ECU connector A-11X (terminals 27 and 28 ) in good condition?

YES: No action to be taken.

NO: Repair the wiring harness. Check that the windshield wiper operates normally when the windshield wiper switch is moved to each position.