INSPECTION PROCEDURE E-2: Keyless Entry System: The Front Dome Light, The Turn-Signal Lights And The Horn Do Not Operate Through The Answerback Function.: Diagnosis

Required Special Tools: 

• MB991223: Harness Set

1. STEP 1. Verify the keyless entry system. 

   Q: Does the keyless entry system work normally? 

   • YES:  Go to Step 2.
   • NO:  Refer to "INSPECTION PROCEDURE E-1: KEYLESS ENTRY SYSTEM DOES NOT OPERATE ".
2. STEP 2. Check the configuration function. 

   Q: Has the answerback function been enabled by means of the adjustment function? 

   • YES:  Go to Step 3.
   • NO:  Enable the answerback function by means of the adjustment function. Verify that the answerback functions work normally.
3. STEP 3. Verify trouble symptom. 

   Q: Which answerback function is defective? 

   • Only the dome light:  Go to Step 4.
   • Only the turn-signal lights:  Go to  Step 5.
   • Only the horn:  Go to  Step 6.
   • None of the dome light and the turn-signal lights and the horn:  Replace the ETACS-ECU. Verify that the answerback functions work normally.
4. STEP 4. Verify the dome light. 

   Q: Does the dome light illuminate normally? 

   • YES:  Replace the ETACS-ECU. Verify that the answerback functions work normally.
   • NO:  Refer to "INSPECTION PROCEDURE L-1: FRONT DOME LIGHT, REAR DOME LIGHT < VEHICLES WITHOUT SUNROOF > AND LUGGAGE COMPARTMENT LIGHT DO NOT ILLUMINATE OR GO OUT NORMALLY ".
5. STEP 5. Verify the hazard warning light. 

   Q: Does the hazard warning light work normally? 

   • YES:  Replace the ETACS-ECU. Verify that the answerback functions work normally.
   • NO:  Refer to "INSPECTION PROCEDURE K-2: HAZARD WARNING LIGHTS DO NOT FLASH WHEN THE HAZARD WARNING LIGHT SWITCH IS TURNED ON ".
6. STEP 6. Verify the horn operation. 

   Q: Does the horn work normally? 

   • YES:  Go to  Step 21.
   • NO:  Go to Step 7.
7. STEP 7. Verify which horn is defective. 

   Q: Which horn does not sound? 

   • horn (HIGH):  Go to Step 8.
   • horn (LOW):  Go to  Step 12.
   • horn (HIGH or LOW):  Go to  Step 17.
8. STEP 8. Check horn (HIGH) connector A-18 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: Is horn (HIGH) connector A-18 in good condition? 

   • YES:  Go to Step 9.
   • NO:  Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION . Verify that the horn sounds normally.
     Fig 1: Identifying Horn (HIGH) Connector A-18

     Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
9. STEP 9. Check the horn. 

   Connect the battery as shown in illustration, and Verify that the horn sounds.

   Q: Is the horn normal? 

   • YES:  Go to Step 10.
   • NO:  Replace the horn. Verify that the horn sounds normally.
     Fig 2: Checking Horn

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10. STEP 10. Check horn relay connector A-05X for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Is horn relay connector A-05X in good condition? 

    • YES:  Go to Step 11.
    • NO:  Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION . Verify that the horn sounds normally.
      Fig 3: Identifying Horn Relay Connector A-05X

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
11. STEP 11. Check the wiring harness between horn relay connector A-05X (terminal 1) and horn (HIGH) connector A-18 (terminal 1.) 

    Q: Is the wiring harness between horn relay connector A-05X (terminal 1) and horn (HIGH) connector A-18 (terminal 1) in good condition? 

    • YES:  Go to  Step 16.
    • 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 horn sounds normally.
      Fig 4: Identifying Horn Relay Connector A-05X

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
      Fig 5: Identifying Horn (HIGH) Connector A-18

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12. STEP 12. Check horn (LOW) connector A-19 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Is horn (LOW) connector A-19 in good condition? 

    • YES:  Go to Step 13.
    • NO:  Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION . Verify that the horn sounds normally.
      Fig 6: Identifying Horn (LOW) Connector A-19

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
13. STEP 13. Check the horn. 

    Connect the battery as shown in illustration, and Verify that the horn sounds.

    Q: Is the horn normal? 

    • YES:  Go to Step 14.
    • NO:  Replace the horn. Verify that the horn sounds normally.
      Fig 7: Checking Horn

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14. STEP 14. Check horn relay connector A-05X for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Is horn relay connector A-05X in good condition? 

    • YES:  Go to Step 15.
    • NO:  Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION . Verify that the horn sounds normally.
      Fig 8: Identifying Horn Relay Connector A-05X

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
15. STEP 15. Check the wiring harness between horn relay connector A-05X (terminal 1) and horn (LOW) connector A-19 (terminal 1.) 

    Q: Is the wiring harness between horn relay connector A-05X (terminal 1) and horn (LOW) connector A-19 (terminal 1) in good condition? 

    • YES:  Go to Step 16.
    • 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 horn sounds normally.
      Fig 9: Identifying Horn Relay Connector A-05X

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
      Fig 10: Identifying Horn (LOW) Connector A-19

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16. STEP 16. Check the fit of the horn. 

    When the theft-alarm system is triggered, check the fit of the horn (HIGH or LOW) which does not sound.

    NOTE: The horn is grounded to the vehicle body via its mounting bolt.

    Q: Is the horn installed correctly. 

    • YES:  No action is necessary and testing is complete.
    • NO:  Install the horn correctly. Verify that the horn sounds normally.
17. STEP 17. Check horn relay connector A-05X for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Are horn relay connector A-05X in good condition? 

    • YES:  Go to Step 18.
    • NO:  Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION . Verify that the horn sounds normally.
      Fig 11: Identifying Horn Relay Connector A-05X

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
18. STEP 18. Check the horn relay. 

    Q: Is the horn relay normal? 

    • YES:  Go to Step 19.
    • NO:  Replace the horn relay. Verify that the horn sounds normally.
      Fig 12: Identifying Horn Relay Connector A-05X

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
      Fig 13: Tester Connection And Specified Condition Chart

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19. STEP 19. Check the battery power supply circuit to the horn relay. Measure the voltage at horn relay connector A-05X. 
    1. Disconnect horn relay connector A-05X and measure the voltage available at the relay box side of the connector.
       Fig 14: Disconnecting Horn Relay Connector A-05X

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    2. Measure the voltage between terminal numbers 2, 4 and ground.
       • The voltage should equal approximately 12 volts (battery positive voltage).

    Q: Is the measured voltage approximately 12 volts (battery positive voltage)? 

    • YES:  No action is necessary and testing is complete.
    • NO:  Go to Step 20.
      Fig 15: Checking Voltage Between Terminal Numbers 2, 4 And Ground

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20. STEP 20. Check the wiring harness between horn relay connector A-05X (terminal 2 and 4) and the battery. 

    Q: Is the wiring harness between horn relay connector A-05X (terminal 2 and 4) and the battery 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 horn sounds normally.
      Fig 16: Identifying Horn Relay Connector A-05X

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
21. STEP 21. Check rear horn relay connector A-05X and ETACS-ECU connector C-227 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Are horn relay connector A-05X and ETACS-ECU connector C-227 in good condition? 

    • YES:  Go to Step 22.
    • NO:  Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION . Verify that the horn sounds normally.
      Fig 17: Identifying Horn Relay Connector A-05X

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
      Fig 18: Identifying ETACS-ECU Connector C-227

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22. STEP 22. Check the wiring harness between horn relay connector A-05X (terminal 3) and ETACS-ECU connector C-227 (terminal 44.) 
    Fig 19: Identifying Horn Relay Connector A-05X

    Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    Fig 20: Identifying ETACS-ECU Connector C-227

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    NOTE: Also check intermediate connector C-129 and joint connector C-101 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-129 or joint connector C-101 are damaged, repair or replace the damaged component(s) as described in HARNESS CONNECTOR INSPECTION .

    Q: Is the wiring harness between horn relay connector A-05X (terminal 3) and ETACS-ECU connector C-227 (terminal 44) in good condition? 

    • YES:  Replace the ETACS-ECU. Verify that the horn sounds 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 horn sounds normally.
      Fig 21: Identifying Intermediate Connector C-129 And Joint Connector C-101

      Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.