Inspection Procedure F-3

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

Windshield Wiper Motor Drive Circuit:

NOTE: This troubleshooting requires use of scan tool MB991502 and SWS monitor kit MB991862. For details of how to use the SWS monitor, refer to "How to use SWS monitor".

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: Test Harness Set
- MB991502: Scan Tool (MUT-II)
- MB991862: SWS monitor kit

STEP 1. Check the input signal by using service data 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 MB991502, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502. Also connect SWS monitor kit MB991862 after turning on scan tool MB991502.

1. Connect scan tool MB991502 to the data link connector.
2. Connect SWS monitor kit MB991862 to the column switch connector.




3. Select "COLUMN ECU" (DATA LIST), and check that normal conditions are displayed on the items described in the table above.

Q: Is normal condition displayed when the windshield wiper switch is moved to each position?

YES: Go to Step 2.

NO: Refer to Inspection Procedure L-6 "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 B-01.
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 B-01 and front-ECU connector A-11X for damage.

Q: Are windshield wiper motor connector B-01 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 B-01 and front-ECU connector A-11X.

NOTE: Also check intermediate connector A-13. If intermediate connectors A-13 is damaged, repair or replace the connector as described in Harness Connector Inspection.

Q: Is the wiring harness between windshield wiper motor connector B-01 and front-ECU connector A-11X 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.