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Inspection Procedure F-1

Windshield Wiper and Washer: The windshield wiper does not work at all.

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

Windshield Wiper Motor Circuit Part 1:




Windshield Wiper Motor Circuit Part 2:






CIRCUIT OPERATION
- The windshield wiper and washer switch sends a signal through the column-ECU (incorporated in the column switch) to the front-ECU. If the column-ECU sends a windshield wiper and washer switch "ON" signal to the front-ECU, the front-ECU turns on the relay (incorporated in the front-ECU), thus causing the windshield wiper and washer motor to be turned on.
- If the SWS communication line is defective, the front-ECU operates windshield wiper motor by using the other communication lines (wiper backup circuit) instead of that line. In this case, the windshield wiper works at low speed regardless of the windshield wiper and washer switch positions ("LO" or "HIGH").

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

TROUBLESHOOTING HINTS
- The wiper motor may be defective
- The column switch (windshield wiper and washer switch) may be defective
- The front-ECU may be defective
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector

DIAGNOSIS

Required Special Tools:
- MB991223: Harness Set
- MB991502: Scan Tool (MUT-II)
- MB991862: SWS monitor kit







STEP 1. Use scan tool MB991502 to select "ECU COMM CHK" on the SWS monitor display.

Check the following ECUs:
- Column-ECU
- Front-ECU

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. Connect the DLC harness before connecting the column-ECU harness. Be sure to 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. Turn the ignition switch to the "ON" position.

4. Operate scan tool MB991502 according to the procedure below to display "ECU COMM CHECK."
1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "SWS MONITOR."
4. Select "ECU COMM CHK."

5. Scan tool MB991502 should show "OK" on the "ECU COMM CHK" menus for both the "COLUMN ECU" and the "FRONT ECU" menus.

Q: Is "OK" displayed on the "COLUMN ECU" and "FRONT ECU" menu?
"OK" is displayed for all the items : Go to Step 2.
"NG" is displayed on the "COLUMN ECU" menu : Refer to Inspection Procedure A-2 "Communication with column switch column-ECU.is not possible."
"NG" is displayed on the "FRONT ECU" menu : Refer to Inspection procedure A-4 "Communication with front-ECU is not possible."







STEP 2. Check the input signal by using "FUNCTION DIAG." menu of the SWS monitor.

Check the input signals from the following switches:
- Ignition switch: ACC
- Windshield wiper switch: INT

Operate the MUT-II according to the procedure below to display "F.WIPER INT."
1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "SWS MONITOR."
4. Select "FUNCTION DIAG."
5. Select "WIPER."
6. Select "F.WIPER INT."




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

Q: Are normal conditions displayed for "INT WIPER SW" and "FRONT ECU ACK"?

YES: Go to Step 3.

NO:
- Normal condition is not displayed on the "INT WIPER SW" Replace the column switch. Verify that the windshield wiper works normally.
- Normal condition is not displayed on the "FRONT ECU SW" Replace the front-ECU. Verify that the windshield wiper works normally.




STEP 3. Check the windshield wiper motor.

1. Disconnect windshield wiper motor connector A-02.
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 4.

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




STEP 4. Check at windshield wiper motor connector A-02 to check the windshield wiper motor ground circuit.

1. Disconnect windshield wiper motor connector A-02, and measure at the wiring harness side.
2. Measure the resistance value between terminal 5 and ground.
- The resistance should measure 2 ohms or less.

Q: Is the measured resistance 2 ohms or less?

YES: Go to Step 7.

NO: Go to Step 5.




STEP 5. Check windshield wiper motor connector A-02 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is windshield wiper motor connector A-02 in good condition?

YES: Go to Step 6.

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




STEP 6. Check the wiring harness between windshield wiper motor connector A-02 (terminal 5) and ground.

Q: Is the wiring harness between windshield wiper motor connector A-02 (terminal 5) and ground in good condition?

YES: No action is necessary and testing is complete.

NO: The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. Verify the windshield wiper works normally.




STEP 7. Measure at front-ECU connector A-11X in order to check the ignition switch (IG2) line of power supply system to the front-ECU.

1. Disconnect front-ECU connector A-11X, and measure at the relay box side.
2. Turn the ignition switch to the "ON" position.

3. Measure the voltage between terminal 30 and ground.
- The voltage should measure approximately 12 volts (battery positive voltage).

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

YES: Replace the front-ECU. Verify that the windshield wiper works normally.

NO: Go to Step 8.




STEP 8. Check front-ECU connector A-11X for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is front-ECU connector A-11X in good condition?

YES: Go to Step 9.

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







STEP 9. Check the wiring harness between front-ECU connector A-11X (terminal 30) and the ignition switch (IG2).

NOTE: Also check junction block connectors C-87 and C-88 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If junction block connector C-87 or C-88 is damaged, repair or replace the damaged component(s) as described in Harness Connector Inspection.

Q: Is the wiring harness between front-ECU connector A-11X (terminal 30) and the ignition switch (IG2) in good condition?

YES: No action is necessary and testing is complete.

NO: The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. Verify that the windshield wiper works normally.
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