Inspection Procedure O-7: Column Switch: ETACS-Ecu Does Not Receive Any Signal From Windshield Mist Wiper Switch, Windshield Intermittent Wiper Switch, Windshield Low-Speed Wiper Switch, Windshield High-Speed Wiper Switch, Windshield Washer Switch, Rear Wiper Switch Or Rear Washer Switch.: 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
• MB991813: SWS Monitor Kit
  • MB991806: SWS Monitor Cartridge
  • MB991812: SWS Monitor Harness (For Column-ECU)
  • MB991822: Probe Harness
• MB991854: SWS Monitor Harness (For 13-pin)

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

   Check the column-ECU.

   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.
   1. Connect the special tool. Refer to "HOW TO CONNECT SWS MONITOR ".
   2. Turn the ignition switch to the "LOCK" (OFF) position.
   3. Operate scan tool MB991958 according to the procedure below to display "ECU COMM CHK."
      1. Select "SYSTEM SELECT."
      2. Select "SWS."
      3. Select "SWS MONITOR."
      4. Select "ECU COMM CHK."
   4. Scan tool MB991958 should show "OK" on the "ECU COMM CHK" menu for the "COLUMN ECU" menu.

   Q: Is "OK" displayed on the "COLUMN ECU" menu? 

   • YES  : Go to Step 2.
   • NO  : Refer to INSPECTION PROCEDURE A-2 "COMMUNICATION WITH COLUMN SWITCH (COLUMN-ECU) IS NOT POSSIBLE ."
     Fig 1: Connecting Special Tool To Data Link Connector

     Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
2. STEP 2. Check the windshield wiper and washer switch. 

   Remove the windshield wiper and washer switch. Then check continuity between the switch terminals.

   Fig 2: Checking Windshield Wiper And Washer Switch Continuity

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   TESTER CONNECTION & SPECIFIED CONDITION CHART
   
   

   SWITCH POSITION	TESTER CONNECTION	SPECIFIED CONDITION
   OFF	4 - 6, 5 - 6, 6 - 7, 6 - 8, 6 - 9, 6 - 10, 6 - 11	Open circuit
   Windshield mist wiper switch	6 - 11	Less than 2 ohms
   Windshield intermittent wiper switch	6 - 10	Less than 2 ohms
   Windshield low-speed wiper switch	6 - 9	Less than 2 ohms
   Windshield high-speed wiper switch	6 - 8	Less than 2 ohms
   Windshield washer switch	6 - 7	Less than 2 ohms
   Rear wiper switch	4 - 6	Less than 2 ohms
   Rear washer switch	5 - 6	Less than 2 ohms

   Q: Are the windshield wiper and washer switch in good condition? 

   • YES  : Go to Step 3.
   • NO  : Replace the column switch. If the equipment, which are described in "CIRCUIT OPERATION ", work normally, the input signal from the column switch (windshield wiper and washer switch) should be normal.
3. STEP 3. Check the column switch body. 

   Remove the turn-signal light and lighting switch and windshield wiper and washer switch. Then check continuity between the switch body terminals.

   Fig 3: Checking Column Switch Continuity

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   TESTER CONNECTION & SPECIFIED CONDITION CHART
   
   

   SWITCH BODY	TESTER CONNECTION	SPECIFIED CONDITION
   Lighting switch side - Windshield wiper and washer switch side	4 - 4, 5 - 5, 6 - 6, 7 - 7, 8 - 8, 9 - 9, 10 - 10, 11 - 11	Less than 2 ohms

   Q: Is the switch body in good condition? 

   • YES  : Go to Step 4.
   • NO  : Replace the column switch. If the equipment, which are described in "CIRCUIT OPERATION ", work normally, the input signal from the column switch (windshield wiper and washer switch) should be normal.
4. STEP 4. Replace the ECU. 
   1. Replace the column switch (turn-signal light and lighting switch).
   2. If the equipment, which are described in "CIRCUIT OPERATION ", work normally, the input signal from the column switch (windshield wiper and washer switch) should be normal.

   Q: Does the column switch (windshield wiper and washer switch) send a normal signal to the ECU? 

   • YES  : No action is necessary and testing is complete.
   • NO  : Replace the ETACS-ECU. If the equipment, which are described in "CIRCUIT OPERATION ", work normally, the input signal from the column switch (windshield wiper and washer switch) should be normal.