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Inspection Procedure F-7

Windshield Wiper and Washer: The windshield washer does not work.

NOTE: This troubleshooting procedure requires 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 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 front-ECU. If the column-ECU sends a windshield washer switch "ON" signal to the front-ECU, the front-ECU turns on the relay (incorporated in the front-ECU), thus causing the windshield washer motor to be turned on.

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

TROUBLESHOOTING HINTS
- The windshield washer 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. Verify the windshield wiper.

Q: Does the windshield wiper operate normally?

YES: Go to Step 2.

NO: Refer to Inspection Procedure F-1 "Windshield wiper does not work at all."







STEP 2. 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 the 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. When the ignition switch is turned to the "LOCK" (OFF) position, scan tool MB991502 should show "OK" on the "ECU COMM CHK" menu for the "COLUMN ECU" and "FRONT ECU" menu.

Q: Is "OK" displayed on the "COLUMN ECU" and "FRONT ECU" menu?
"OK" is displayed for all the items : Go to Step 3.
"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 3. Check the input signal by using service data of the SWS monitor.

Check the input signals from the following switches:
- Ignition switch: ACC
- Windshield washer switch: ON

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




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

Q: Are normal conditions displayed for "FRONT WASH.SW" and "FRONT ECU ACK"?

YES: Go to Step 4.

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







STEP 4. Check the windshield washer motor.

1. Disconnect windshield washer motor connector A-33, 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 gush out.

Q: Does the windshield washer motor operate normally?

YES: Go to Step 5.

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




STEP 5. Check at windshield washer motor connector A-33 to check the windshield washer motor ground circuit.

1. Disconnect windshield washer motor connector A-33, and measure at the wiring harness side.
2. Measure the resistance value between terminal 2 and ground.
- The resistance should measure 2 ohms or less.

Q: Is the measured resistance 2 ohms or less?

YES: Go to Step 8.

NO: Go to Step 6.




STEP 6. Check windshield washer motor connector A-33 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is windshield washer motor connector A-33 in good condition?

YES: Go to Step 7.

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




STEP 7. Check the wiring harness between windshield washer motor connector A-33 (terminal 2) and ground.

Q: Is the wiring harness between windshield washer motor connector A-33 (terminal 2) 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 that the windshield washer works normally.







STEP 8. Check windshield washer motor connector A-33 and front-ECU connector A-11X for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Are windshield washer motor connector A-33 and 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 washer works normally.










STEP 9. Check the wiring harness between windshield washer motor connector A-33 (terminal 1) and front-ECU connector A-11X (terminal 21).

NOTE: Also check intermediate connector C-05 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-05 is damaged, repair or replace the damaged component(s) as described in Harness Connector Inspection.

Q: Is the wiring harness between windshield washer motor connector A-33 (terminal 1) and front-ECU connector A-11X (terminal 21) 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 washer works normally.
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