INSPECTION PROCEDURE O-7: Column Switch: ETACS-ECU does not Receive Any Signal from the Taillight Switch, the Headlight Switch, the Passing Light Switch, the Dimmer Switch, the Turn-signal Light Switch or Switch.: Diagnosis

Required Special Tools: 

• MB991223: Harness Set
• MB991958: Scan Tool (MUT-III Sub Assembly)
  • MB991824: Vehicles 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)
  • MB991922: Probe harness

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. Connect special tool MB991910 before connecting special tool MB991812. Be sure to connect special tool MB991806 after turning on special tool MB991824.
   1. Connect the special tool. Refer to "HOW TO CONNECT SWS MONITOR  ."
      Fig 1: Connecting Special Tool MB991911 To Data Link Connector

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
      Fig 2: Connecting Special Tool MB991812 To Column Switch Connector

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
   2. Turn the ignition switch to the "ON" position.
   3. Operate the scan tool according to the procedure below to display "ECU COMM Check."
      1. Select "Interactive Diagnosis."
      2. Select "System select."
      3. Select "SWS."
      4. Select "SWS MONITOR."
      5. Select "ECU COMM Check."
   4. Scan tool (MUT-III) should show "OK" on the "ECU COMM Check" 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 THE COLUMN SWITCH (COLUMN-ECU) IS NOT POSSIBLE  ."
2. STEP 2. Check the turn-signal light and lighting switch. 

   Remove the turn-signal light and the lighting switch.Then check continuity between the switch terminals.

   Fig 3: Identifying Turn-Signal Light And Lighting Switch Terminals

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

   SWITCH POSITION	TESTER CONNECTION	SPECIFIED CONDITION
   OFF	1 - 2, 2 - 3, 2 - 11, 2 - 12, 5 - 9, 7 - 9	Open circuit
   Taillight switch	5 - 9	Less than 2 ohms
   Headlight switch	5 - 9, 7 - 9	Less than 2 ohms
   Passing switch	2 - 12	Less than 2 ohms
   Dimmer switch	2 - 11, 2 - 12	Less than 2 ohms
   Turn-signal light switch (LH)	1 - 2	Less than 2 ohms
   Turn-signal light switch (RH)	2 - 3	Less than 2 ohms

   Q: Is the turn-signal light and lighting switch in good condition? 

   • YES:  Go to Step 3.
   • NO:  Replace it. The input signal from the column switch (turn-signal light and lighting switch) should be able to be checked and the functions, which are described in the "Technical Description (comment)," should work normally.
3. STEP 3. Replacement of ECU 
   1. Replace the column switch.
   2. The input signal from the column switch (turn-signal light and lighting switch) should be able to be checked and the functions, which are described in the "Technical Description (comment)," should work normally.

   Q: Is the input signal from the column switch (turn-signal light and lighting switch) input normally? 

   • YES:  No action is necessary and testing is complete.
   • NO:  Replace the ETACS-ECU. The input signal from the column switch (turn-signal light and lighting switch) should be able to be checked and the functions, which are described in the "Technical Description (comment)," should work normally.