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Home >> Mitsubishi >> 2003 >> Eclipse L4-2.4L 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-1

Inspection Procedure G-1

Windshield Wiper And Washer: Windshield Wiper Does No Not Work At All.

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."

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
- Malfunction of the wiper motor
- Malfunction of the column switch (windshield wiper and washer switch)
- Malfunction of the front-ECU
- Damaged harness wires or connectors

DIAGNOSIS

Required Special Tools:
- MB991223: Test Harness Set
- MB991502: Scan Tool (MUT-II)
- MB991862: SWS Monitor Kit

STEP 1. Use scan tool to select "ECU COMM CHECK" 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. 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. Turn the ignition switch to the "ON" position.
4. Operate the MUT-II 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 CHECK."
5. Scan tool MB991502 should show "OK" on the "ECU COMM CHECK" menu.

Q: Are "OK" displayed on the "COLUMN ECU" and "FRONT ECU" menu?
"OK" are displayed for all the items : Go to Step 2.
"NG" is displayed on the "COLUMN ECU" menu : "NG" is displayed on the "COLUMN ECU" menu: Refer to Inspection Procedure A-2 "Communication with column switch (column-ECU) is impossible."
"NG" is displayed on the "FRONT ECU" menu : "NG" is displayed on the "FRONT ECU" menu: Refer to Inspection procedure A-4 "Communication with front-ECU is impossible."

STEP 2. Check the input signal by using "FUNCTION DIAGNOSIS" 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 HI."
1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "SWS MONITOR."
4. Select "FUNCTION DIAGNOSIS"
5. Select "WIPER."
6. Select "F.WIPER HI."




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

Q: Does the scan tool display the items "INT WIPER" and "FRONT ECU ACK" as normal condition?

YES: Go to Step 3.

NO:
- The scan tool does not show the respective normal condition for item "INT WIPER SW." Replace the column switch. Check that the windshield wiper works normally.
- The scan tool does not show the respective normal condition for item "FRONT ECU SW." Replace the front-ECU. Check that the windshield wiper works normally.




STEP 3. Check the windshield wiper motor.

1. Disconnect windshield wiper motor connector A-03.
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. Check that the windshield wiper works normally.

STEP 4. Check at windshield wiper motor connector A-03 to check the windshield wiper motor ground circuit.




1. Disconnect windshield wiper motor connector A-03, and measure at the wiring harness side.




2. Measure the resistance value between terminal 5 and ground.
- The measured value should be 2 ohm or less.

Q: Does the measured resistance value correspond with this range?

YES: Go to Step 7.

NO: Go to Step 5.




STEP 5. Check windshield wiper motor connector A-03 for damage.

Q: Is windshield wiper motor connector A-03 in good condition?

YES: Go to Step 6.

NO: Repair or replace the connector. Refer to Harness Connector Inspection. Check that the windshield wiper works normally.




STEP 6. Check the wiring harness between windshield wiper motor connector A-03 (terminal 5) and ground.

Q: Is the wiring harness between windshield wiper motor connector A-03 (terminal 5) and ground in good condition?

YES: No action to be taken.

NO: Repair the wiring harness. Check that 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 measured value should be approximately 12 volts (battery positive voltage).

Q: Does the measured voltage correspond with this range?

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

NO: Go to Step 8.




STEP 8. Check the front-ECU connector A-11X for damage.

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

YES: Go to Step 9.

NO: Repair or replace the connector. Refer to Harness Connector Inspection. Check 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 intermediate connector C-89, junction block connectors C-111 and C-112. If intermediate connectors C-89 or junction block connector C-111 or C-112 is damaged, repair or replace the connector 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 to be taken.

NO: Repair the wiring harness. Check that the windshield wiper works normally.
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