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Home >> Mitsubishi >> 2012 >> Eclipse L4-2.4L (4G69) >> Repair and Diagnosis >> Body and Frame >> Body Control Systems >> Testing and Inspection >> Symptom Related Diagnostic Procedures >> Windshield Wiper and Washer >> Inspection Procedure G-1

Inspection Procedure G-1




INSPECTION PROCEDURE G-1: Windshield Wiper and Washer: The windshield wipers do not work at all.

NOTE:
This troubleshooting procedure requires use of scan tool MB991958 and SWS monitor kit MB991813.
For details on how to use the SWS monitor, refer to "How to use SWS monitor How to Use SWS Monitor."


















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

- Trouble in input signal system
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector
- The wiper motor may be defective
- The column switch may be defective
- The front-ECU may be defective

DIAGNOSIS

Required Special Tools:

- MB991223: Harness Set
- MB992006: Extra Fine Probe
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A
- MB991813: SWS Monitor Kit
- MB991806: SWS Monitor Cartridge
- MB991812: SWS Monitor Harness (For Column-ECU)
- MB991822: Probe Harness

STEP 1. Use scan tool MB991958 to select "ECU COMM Check"
on the SWS monitor display.

Check the following ECUs:

- Column-ECU
- Front-ECU









(1)
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 special tool MB991910 before connecting special tool MB991812. Be sure to connect special tool MB991806 after turning on special tool MB991824.

Connect the special tool. Refer to "How to connect SWS monitor How to Connect SWS Monitor."
(2)Turn the ignition switch to the "ON" position.
(3)Operate scan tool MB991958 according to the procedure below to display "ECU COMM Check."

.....Select "Interactive Diagnosis."

.....Select "System select."

.....Select "SWS."

.....Select "SWS MONITOR."

.....Select "ECU COMM Check."
(4)Scan tool MB991958 should show "OK" on the "ECU COMM Check" menus for both the
"COLUMN ECU" and the "FRONT ECU" menus.

Q. Are "OK" displayed for the "COLUMN ECU" and "FRONT ECU" menu?

"OK" are displayed for all the items : Go to Step 2.

"NG" is displayed for the "COLUMN ECU" menu : Refer to Inspection Procedure A-2 "Communication with the column switch (column-ECU) is not possible Inspection Procedure A-2."

"NG" is displayed for the "FRONT ECU" menu : Refer to Inspection procedure A-4 "Communication with the front-ECU is not possible Inspection Procedure A-4."

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









(1)Operate the M.U.T.-III according to the procedure below to display "F.WIPER INT."

.....Select "Interactive Diagnosis."

.....Select "System select."

.....Select "SWS."

.....Select "SWS MONITOR."

.....Select "Function Diag."

.....Select "WIPER."

.....Select "F.WIPER INT."
(2)Check that normal conditions are displayed for the items described in the table below.





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

Normal conditions displayed for all the items : Go to Step 3.

Normal condition is not displayed for the "INT WIPER SW" : Replace the column switch. Verify that the windshield wiper works normally.

Normal condition is not displayed for the "FRONT ECU ACK" : Replace the front-ECU. Verify that the windshield wiper works normally.

STEP 3. Check windshield wiper motor connector A-05 for loose, corroded or damaged terminals, or terminals pushed back in the connector.





Q. Is windshield wiper motor connector A-05 in good condition?

YES Go to Step 4.

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

STEP 4. Check the windshield wiper motor.





(1)Disconnect windshield wiper motor connector A-05.





(2)Connect a battery to the windshield wiper motor as shown. Then check that the windshield wiper motor operates normally at high and low speeds.

Q. Does the windshield wiper motor operate normally?

YES Go to Step 5.

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

STEP 5. Check the ground circuit to the windshield wiper motor. Measure the resistance at the windshield wiper motor connector A-05.





(1)Disconnect windshield wiper motor connector A-05 and measure the resistance available at the wiring harness side of the connector.





(2)Measure the resistance value between terminal 4 and ground.

- The resistance should be 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 windshield wiper motor connector A-05 (terminal 4) and ground.

- Check the ground wire for open circuit.





Q. Is the wiring harness between windshield wiper motor connector A-05 (terminal 4) 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. Check front-ECU connector A-14X for loose, corroded or damaged terminals, or terminals pushed back in the connector.





Q. Is front-ECU connector A-14X in good condition?

YES Go to Step 8.

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

STEP 8. Check the ignition switch (ACC) circuit to the front-ECU.
Measure the voltage at front-ECU connector A-14X.





(1)Disconnect front-ECU and measure the resistance available at the relay box side of the connector.
(2)Turn the ignition switch to the "ON" position.





(3)Measure the voltage between terminal 28 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 9.

STEP 9. Check the wiring harness between front-ECU connector A-14X
(terminal 28) and the ignition switch (ACC).

- Check the power supply line for open circuit and short circuit.









NOTE:
Also check intermediate connector C-24 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-24 is damaged, repair or replace the damaged component(s) as described in Harness Connector Inspection Harness Connector Inspection.

Q. Is the wiring harness between front-ECU connector A-14X (terminal 28) and the ignition switch (ACC) in good condition?

YES Inspection Procedure.

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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