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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 >> H - Charts >> Inspection Procedure H-4

Inspection Procedure H-4

Rear Wiper and Washer: Rear washer does not operate.

Rear Washer Motor Power Supply Circuit Part 1:




Rear Washer Motor Power Supply Circuit Part 2:






CIRCUIT OPERATION
The rear washer switch sends a signal through the column-ECU (incorporated in the column switch) to the ETACS-ECU. If the column-ECU sends a rear washer switch "ON" signal to the ETACS-ECU, the ETACS-ECU turns on the relay (incorporated in the ETACS-ECU), thus causing the rear washer motor to be turned on.

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

TROUBLESHOOTING HINTS
- The rear washer motor may be defective
- The column switch (windshield wiper and washer switch) may be defective
- The ETACS-ECU may be defective

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 rear wiper.

Q: Does the rear wiper operate?

YES: Go to Step 2.

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

STEP 2. Check the input signal by using "FUNCTION DIAG." menu of the SWS monitor.
Set each switch to the following condition before checking input signals from the rear washer switch:
- Ignition switch: ACC
- Rear washer switch: ON

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. Operate scan tool MB991958 according to the procedure below to display "REAR WASHER."
1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "SWS MONITOR."
4. Select "FUNCTION DIAG."
5. Select "REAR WIPER."
6. Select "REAR WASHER."




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

Q: Is normal conditions displayed?

YES: Go to Step 3.

NO: Refer to Inspection Procedure N-6 "ETACS-ECU does not receive a signal from the rear washer switch."




STEP 3. Check rear washer motor connector A-23 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is rear washer motor connector A-23 in good condition?

YES: Go to Step 4.

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

STEP 4. Check the rear washer motor.




1. Disconnect rear washer motor connector A-23.
2. Fill the washer tank with washer fluid.




3. When battery voltage is applied between terminals 1 and 2, washer fluid should gush out.

Q: Does the rear washer motor operate normally?

YES: Go to Step 5.

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

STEP 5. Check the ground circuit to the rear washer motor. Test at rear washer motor connector A-23.




1. Disconnect rear washer motor connector A-23 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 7.

NO: Go to Step 6.




STEP 6. Check the wiring harness between rear washer motor connector A-23 (terminal 1) and ground.

Q: Is the wiring harness between rear washer motor connector A-23 (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 rear washer works normally.




STEP 7. Check ETACS-ECU connector C-227 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is ETACS-ECU connector C-227 in good condition?

YES: Go to Step 8.

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










STEP 8. Check the wiring harness between rear washer motor connector A-23 (terminal 2) and ETACS-ECU connector C-227 (terminal 23).

NOTE: Also check intermediate connector C-111 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connectors C-111 is damaged, repair or replace the damaged component(s) as described in Harness Connector Inspection.

Q: Is the wiring harness between rear washer motor connector A-23 (terminal 2) and ETACS-ECU connector C-227 (terminal 23) in good condition?

YES: Replace the ETACS-ECU. Verify that the rear washer works normally.

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 rear washer works normally.
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