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Home >> Mitsubishi >> 2004 >> Lancer L4-2.0L SOHC >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Information Bus >> Testing and Inspection >> Symptom Related Diagnostic Procedures >> Symptom Diagnostic Procedures >> G - Charts >> Inspection Procedure G-7

Inspection Procedure G-7

Windshield Wiper and Washer: Windshield washer does not work.

Windshield Wiper Motor Circuit Part 1:




Windshield Wiper 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 may be defective (windshield wiper and washer switch)
- 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
- MB991958: Scan Tool (MUT-III Sub Assembly)
- MB991824: Vehicle Communication Interface (V.C.I.)
- MB991827: MUT-III USB Cable
- MB991911: MUT-III Main Harness B
- 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 G-1 "Windshield wiper does not work at all."

STEP 2. Use scan tool MB991958 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 MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Connect the DLC harness before connecting the column-ECU harness. Be sure to connect SWS monitor kit MB991862 after turning on scan tool MB991958.







1. Connect scan tool MB991958 to the data link connector.
2. Connect SWS monitor kit MB991862 to the column switch connector.
3. Turn the ignition switch to the LOCK" (OFF) position.
4. Operate scan tool MB991958 according to the procedure below to display "ECU COMM CHK."
1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "SWS MONITOR."
4. Select "ECU COMM CHK."

5. Scan tool MB991958 should show "OK" on the "ECU COMM CHK" menus for both the "COLUMN ECU" and the "FRONT ECU" menus.

Q: Is "OK" displayed on both the "COLUMN ECU" and "FRONT ECU" menus?

"OK" are 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 "FUNCTION DIAG." menu of the SWS monitor.
Check the input signals from the following switches:
- Ignition switch: ACC
- Windshield washer switch: ON







Operate scan tool MB991958 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 on the "FRONT WASH.SW" and "FRONT ECU ACK"?

Normal conditions displayed for all the items : Go to Step 4.

The scan tool does not show the respective normal condition for item "FRONT WASH. SW" : Normal condition is not displayed on the "FRONT WASH.SW": Replace the column switch. Verify that the windshield washer works normally.

The scan tool does not show the respective normal condition for item "FRONT ECU ACK" : Normal condition is not displayed on the "FRONT ECU ACK": Replace the front-ECU. Verify that the windshield washer works normally.




STEP 4. Check windshield washer motor connector A-22 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is windshield washer motor connector A-22 in good condition?

YES: Go to Step 5.

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

STEP 5. Check the windshield washer motor.




1. Disconnect windshield washer motor connector A-22 and measure the voltage available at the windshield washer motor side of the connector.
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 6.

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

STEP 6. Check the ground circuit to the windshield washer motor. Test at windshield washer motor connector A-22




1. Disconnect windshield washer motor connector A-22 and measure the resistance available at the wiring harness side of the connector.




2. Measure the resistance value between terminal 1 and ground.
- The resistance should equal 2 Ohms or less.

Q: Is the measured resistance 2 Ohms or less?

YES: Go to Step 8.

NO: Go to Step 7.




STEP 7. Check the wiring harness between windshield washer motor connector A-22 (terminal 1) and ground.

Q: Is the wiring harness between windshield washer motor connector A-22 (terminal 1) 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 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 washer works normally.













STEP 9. Check the wiring harness between windshield washer motor connector A-22 (terminal 2) and front-ECU connector A-11X (terminal 21).

NOTE: Also check intermediate connectors C-111 and C-129 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connectors C-111 or C-129 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-22 (terminal 2) 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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