Inspection Procedure 1: The sunshade illumination does not illuminate: Diagnosis

Required Special Tools: 

• MB991223: Harness Set
• MB992006: Extra Fine Probe

1. STEP 1. Sunshade illumination operation check 

   Set the ignition switch to the ACC position, and then check that the sunshade illumination turns ON when the sunshade illumination changeover switch is pressed.

   Q: Is the check result normal? 

   • YES:  The diagnosis is complete.
   • NO:  Got to Step 2.
2. STEP 2. Front dome light operation check 

   Check if the front dome light illuminates and goes out normally.

   Q: Is the check result normal? 

   • YES:  Go to Step 3.
   • NO:  Refer to INSPECTION PROCEDURE 1: THE FRONT DOME LIGHT DOES NOT ILLUMINATE NORMALLY .
3. STEP 3. Using scan tool MB991958, read the diagnostic trouble code. 
   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 scan tool MB991958. Refer to "HOW TO CONNECT SCAN TOOL (M.U.T.-III) ."
   2. Turn the ignition switch to the "ON" position.
   3. Check whether the ETACS-ECU related DTC is set.
   4. Turn the ignition switch to the "LOCK" (OFF) position.

   Q: Is the DTC set? 

   • YES:  Diagnose the ETACS-ECU. Refer to DIAGNOSTIC TROUBLE CODE TABLE .
   • NO:  Go to Step 4.
4. STEP 4. Using scan tool MB991958, check data list 

   Check the input signal from the ignition switch (ACC) in ETACS-ECU.

   • Turn the ignition switch to the ACC position.

     Item No.	Item name	Normal condition
     Item 288	ACC switch	ON

     OK: Normal condition is displayed 

   Q: Is the check result normal? 

   • YES:  Go to Step 5.
   • NO:  Troubleshoot the ETACS-ECU. Refer to TROUBLE SYMPTOM CHART FOR INPUT SIGNAL .
5. STEP 5. Check ETACS-ECU connector C-411 and C-415, sunshade illumination changeover switch connector E-12, intermediate connector E-14 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: Is ETACS-ECU connector C-411 and C-415, sunshade illumination changeover switch connector E-12, intermediate connector E-14 in good condition? 

   • YES:  Go to Step 6.
   • NO:  Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION .
6. STEP 6. Resistance measurement at the E-14 intermediate connector 
   1. Disconnect the connector, and measure at the ground side.
   2. Measure the resistance between the E-14 intermediate connector terminal No. 3 and the body ground.

      OK: The measured value should be continuity exists (2 ohms or less). 

   Q: Is the measured resistance 2 ohms or less? 

   • YES:  Go to  Step 8.
   • NO:  Go to Step 7.
     Fig 1: Measuring Resistance Between E-14 Intermediate Connector Terminal No.3 And Body Ground

     Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
7. STEP 7. Check the wiring harness between the intermediate connector E-14 terminal No. 3 and the ground 
   • Check the ground wires for open circuit.

   Q: Is the wiring harness between the intermediate connector E-14 terminal No. 3 and ground in good condition? 

   • YES:  The trouble can be an intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
   • 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.
8. STEP 8. Check the wiring harness between ETACS-ECU connector C-415 terminal No. 18 and the intermediate connector E-14 terminal No. 4 
   NOTE: Also check intermediate connector C-226 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-226 is damaged, repair or replace the connector as described in HARNESS CONNECTOR INSPECTION .
   • Check the power supply lines for open and short circuit.

   Q: Is the wiring harness between ETACS-ECU connector C-415 terminal No. 18 and the intermediate connector E-14 terminal No. 4 in good condition? 

   • YES:  Go to Step 9.
   • 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.
9. STEP 9. Check of sunshade illumination changeover switch 

   Check the sunshade illumination changeover switch. Refer to SUNSHADE ILLUMINATION CHANGEOVER SWITCH REMOVAL AND INSTALLATION  .

   Q: Is the check result normal? 

   • YES:  Go to Step 10.
   • NO:  Replace the sunshade illumination changeover switch.
10. STEP 10. Resistance measurement at the E-12 sunshade illumination changeover switch connector 
    1. Disconnect the connector, and measure at the wiring harness side.
    2. Measure the resistance between the E-12 sunshade illumination changeover switch connector terminal No. 1 and the body ground.

       OK: The measured value should be continuity exists (2 ohms or less). 

    Q: Is the measured resistance 2 ohms or less? 

    • YES:  Go to  Step 12.
    • NO:  Go to Step 11.
      Fig 2: Measuring Resistance Between E-12 Sunshade Illumination Changeover Switch Connector Terminal No.1 And Body Ground

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
11. STEP 11. Check the wiring harness between the sunshade illumination changeover switch connector E-12 terminal No. 1 and the ground 
    • Check the ground wires for open circuit.

    Q: Is the wiring harness between sunshade illumination changeover switch connector E-12 terminal No. 1 and ground in good condition? 

    • YES:  The trouble can be an intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
    • 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.
12. STEP 12. Check the wiring harness between ETACS-ECU connector C-411 terminal No. 17 and sunshade illumination changeover switch connector E-12 terminal No. 2 
    NOTE: Also check intermediate connector C-226 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-226 is damaged, repair or replace the connector as described in HARNESS CONNECTOR INSPECTION .
    • Check the power supply lines for open and short circuit.

    Q: Is the wiring harness between ETACS-ECU connector C-411 terminal No. 17 and sunshade illumination changeover switch connector E-12 terminal No. 2 in good condition? 

    • YES:  Go to Step 13.
    • 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.
13. STEP 13. Retest the system 

    Set the ignition switch to the ACC position, and then check that the sunshade illumination turns ON when the sunshade illumination changeover switch is pressed.

    Q: Do the sunshade illumination work normal? 

    • YES:  The trouble can be an intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
    • NO:  Replace the ETACS-ECU.