Inspection Procedure 4: The windshield wipers do not work normally: Diagnosis

WARNING: This page is about a different car, the 2014 Mitsubishi Outlander. However, it is still accessible from the selected car via links, so may be relevant.

STEP 1. Using scan tool (M.U.T.-III), read the diagnostic trouble code.
CAUTION: To prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the OFF position before connecting or disconnecting scan tool (M.U.T.-III).
1. Connect scan tool (M.U.T.-III). Refer to HOW TO CONNECT THE SCAN TOOL (M.U.T.-III) ."
2. Turn the ignition switch to ON.
3. Check if an ETACS-related diagnosis trouble code is stored.
4. Turn the ignition switch to OFF.
Q: Is the DTC stored?
- YES: Diagnose the ETACS. (Refer to DIAGNOSIS TROUBLE CODE CHART .)
- NO: Go to Step 2.

STEP 2. Using scan tool (M.U.T.-III), check data list.

CAUTION: To prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the OFF position before connecting or disconnecting scan tool (M.U.T.-III).

Connect scan tool (M.U.T.-III). Refer to HOW TO CONNECT THE SCAN TOOL (M.U.T.-III) ."
Turn the ignition switch to OFF.

Check the input signal related to the windshield wiper operation.

Ignition switch: ACC

Operate the windshield wiper switch at each switch position.

Item No.	Item name	Windshield wiper switch position	Normal condition
Item 235	Front wiper ACT	LO	ON
		HI	ON
		INTO	ON and OFF
		MIST	ON
Item 236	Front wiper Lo/Hi	LO	OFF
		HI	ON
		INTO	OFF
		MIST	ON

OK: Normal condition is displayed.

Q: Is the check result normal?

YES < Normal conditions are displayed for all items >: Go to Step 3.
NO < Normal condition is not displayed for item Nos. 235 and/or 236 >: Troubleshoot the ETACS-ECU. Refer to INSPECTION PROCEDURE 11 "COLUMN SWITCH SIGNAL IS NOT RECEIVED ." .

STEP 3. Check that the windshield wipers work.
Check that the windshield wipers work at high speed and the mist mode.

Q: Is the check result normal?
- YES: Go to Step 4.
- NO: Go to Step 8.
STEP 4. Check the windshield wiper motor.
1. Disconnect windshield wiper motor connector.
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: Is the check result normal?
- YES: Go to Step 5.
- NO: Replace the windshield wiper motor.
  
  Fig 1: Checking Windshield Wiper Motor
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
STEP 5. Measure the voltage at windshield wiper motor connector.
1. Disconnect the connector, and measure the voltage at the wiring harness side.
2. Ignition switch: ACC
3. Windshield wiper switch: LO
4. Measure the voltage between the windshield wiper motor connector power supply terminal and the body ground
  OK: System voltage
Q: Is the check result normal?
- YES: Intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .)
- NO: Go to Step 6.
STEP 6. Check of open, short circuit in W. LO line between windshield wiper motor connector and ETACS-ECU connector.
Q: Is the check result normal?
- YES: Go to Step 7.
- NO: Repair the connector(s) or wiring harness.
STEP 7. Retest the system.
Check that the windshield wipers work normally by moving the switch to each position.

Q: Is the check result normal?
- YES: Intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
- NO: Replace the ETACS-ECU.
STEP 8. Measure the voltage at windshield wiper motor connector.
1. Disconnect the connector, and measure the voltage at the wiring harness side.
2. Ignition switch: ACC
3. Windshield wiper switch: HI, MIST
4. Measure the voltage between the windshield wiper motor connector power supply terminal and the body ground.
  OK: System voltage
Q: Is the check result normal?
- YES: Intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
- NO: Go to Step 9.
STEP 9. Check of open, short circuit in W.HI line between windshield wiper motor connector and ETACS-ECU connector.
Q: Is the check result normal?
- YES: Go to Step 10.
- NO: Repair the connector(s) or wiring harness.
STEP 10. Retest the system.
Check that the windshield wipers work normally by moving the switch to each position.

Q: Is the check result normal?
- YES: Intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
- NO: Replace the ETACS-ECU.