INSPECTION PROCEDURE M-8: Column Switch: ETACS-ECU does not receive any signal from the variable intermittent wiper control switch.: Diagnosis

Required Special Tools: 

• MB991223: Harness Set
• MB992006: Extra Fine Probe

1. STEP 1. Check column switch connector C-309 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: Is column switch connector C-309 in good condition? 

   YES :  Go to Step 2.

   NO :  Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION . If the wiper interval can be adjusted normally, the variable intermittent wiper control switch should send a signal to the ECU.

   Fig 1: Identifying Connector C-309 Terminals

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
2. STEP 2. Check the variable intermittent wiper control switch. 
   1. Remove the windshield wiper and washer switch, and check at the switch side.
   2. Measure the resistance value between terminals 3 and 6. The measured resistance should change smoothly from approximately 0 ohm ("FAST" position) to 1 kΩ ("SLOW" position).

   Q: Is the variable intermittent wiper control switch in good condition? 

   YES :  Go to Step 3.

   NO :  Replace the column switch (windshield wiper and washer switch). If the wiper interval can be adjusted normally, that the variable intermittent wiper control switch should send a signal to the ECU.

   Fig 2: Identifying Terminals Of Windshield Wiper And Washer Switch

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
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.

   TESTER CONNECTION AND SPECIFIED CONDITION
   
   

   SWITCH BODY	TESTER CONNECTION	SPECIFIED CONDITION
   Lighting switch side - Windshield wiper and washer switch side	3 - 3, 6 - 6	Less than 2 ohms

   Q: Is the column switch body in good condition? 

   YES :  Go to Step 4.

   NO :  Replace the column switch body. If the wiper interval can be adjusted normally, it indicates that the variable intermittent wiper control switch should send a signal to the ECU.

   Fig 3: Identifying Lighting Switch And Windshield Wiper And Washer Switch Terminals

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
4. STEP 4. Check ETACS-ECU connector C-218 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: Is ETACS-ECU connector C-218 in good condition? 

   YES :  Go to Step 5.

   NO :  Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION . If the wiper interval can be adjusted normally, that the variable intermittent wiper control switch should send a signal to the ECU.

   Fig 4: Identifying Connector C-218 Terminals

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
5. STEP 5. Check the wiring harness between column switch connector C-309 (terminal 6) and ETACS-ECU connector C-218 (terminal 66). 

   Q: Is the wiring harness between column switch connector C-309 (terminal 6) and ETACS-ECU connector C-218 (terminal 66) in good condition? 

   YES :  Go to Step 6.

   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. If the wiper interval can be adjusted normally, the variable intermittent wiper control switch should send a signal to the ECU.

   Fig 5: Identifying Connector C-218 Terminals

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   Fig 6: Identifying Connector C-309 Terminals

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
6. STEP 6. Replace the column switch. 
   1. Replace the column switch.
   2. If the wiper interval can be adjusted normally, the variable intermittent wiper control switch should send a signal to the ECU.

   Q: Can input signal be confirmed when the variable intermittent wiper control switch is operated? 

   YES :  No action is necessary and testing is complete.

   NO :  Replace the ETACS-ECU. When the ETACS-ECU is replaced, register the encrypted code. Refer to ENCRYPTED CODE REGISTRATION CRITERIA TABLE . If the wiper interval can be adjusted normally, the variable intermittent wiper control switch should send a signal to the ECU.