INSPECTION PROCEDURE 1: Rear wiper does not work at all: Diagnosis

Required Special Tools: 

• MB991223: Harness Set
• MB992006: Extra Fine Probe
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
  • MB991824: Vehicles communication interface (V.C.I.)
  • MB991827: M.U.T.-III USB cable
  • MB991911: M.U.T.-III Main harness B

1. STEP 1. Use the scan tool MB991958 to check if an ETACS-related diagnostic trouble code is set. 

   Connect the scan tool. Refer to "DIAGNOSTIC FUNCTION ."

   Q: Is the diagnostic trouble code set? 

   • YES:  Diagnose the ETACS-ECU. Refer to "DIAGNOSTIC TROUBLE CODE CHART ."
   • NO:  Go to Step 2.
     Fig 1: Connecting Scan Tool To Data Link Connector

     Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
2. STEP 2. Check the input signal related to the rear wiper operation. 
   • Ignition switch: ACC

     Item No.	Item name	Normal condition
     Item 239	Rear wiper	ON
     Item 288	ACC switch	ON

     OK: Normal condition is displayed. 

   Q: Is the check result normal? 

   • NO:  Go to Step 3.
   • YES:  Refer to TROUBLE SYMPTOM CHART FOR INPUT SIGNAL .
3. STEP 3. Check the rear wiper motor connector F-32 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: Is rear wiper motor connector F-32 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 wiper works normally.
4. STEP 4. Check the rear wiper motor. 
   1. Disconnect rear wiper motor connector F-32.
   2. Connect a battery to the wiper motor as shown in the illustration and inspect the motor operation.

   Q: Is the rear wiper motor in good condition? 

   • YES:  Go to Step 5.
   • NO:  Replace the rear wiper motor. Verify that the rear wiper works normally.
     Fig 2: Inspecting Rear Wiper Motor Operation

     Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
5. STEP 5. Check the ground circuit to the rear wiper motor. Measure the resistance at the rear wiper motor connector F-32. 
   1. Disconnect rear wiper motor connector F-32 and measure the resistance available at the wiring harness side of the connector.
   2. Measure the resistance value between terminal 3 and ground.
      • The resistance should be 2 Ω or less.

   Q: Is the measured resistance 2 Ω or less? 

   • YES:  Go to Step 7.
   • NO:  Go to Step 6.
     Fig 3: Measuring Resistance Between Rear Wiper Motor Connector F-32 Terminal 3 And Ground

     Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
6. STEP 6. Check the wiring harness between rear wiper motor connector F-32 (terminal 3) and ground. 

   Q: Is the wiring harness between rear wiper motor connector F-32 (terminal 3) 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 wiper works normally.
7. STEP 7. Check ETACS-ECU connector C-311 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: Is ETACS-ECU connector C-311 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 wiper works normally.
8. STEP 8. Check the wiring harness between rear wiper motor connector F-32 (terminal 1) and ETACS-ECU connector C-311 (terminal 5). 
   NOTE: Also check junction block connector D-15, F-30 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION .

   Q: Is the wiring harness between rear wiper motor connector F-32 (terminal 1) and ETACS-ECU connector C-311 (terminal 5) in good condition? 

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