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Home >> Infiniti >> 2024 >> QX55 Essential >> Repair and Diagnosis >> Brakes >> Traction Control >> Brake Control System (VDC/TCS/Abs) (DTC/Circuit Diagnosis) >> DTC/Circuit Diagnosis >> C1116 Stop Lamp Switch >> Diagnosis Procedure

Diagnosis Procedure

NOTE: SYMBOL DTC "C1116" may be detected when the brake pedal and the accelerator pedal are simultaneously depressed for 1 minute or more while driving the vehicle. This is not a malfunction.
  1. INTERVIEW FROM THE CUSTOMER 
    1. Check if the brake pedal and the accelerator pedal are simultaneously depressed for 1 minute or more while driving the vehicle.

    Is there such a history?

    YES>>

    GO TO 2.

    NO>>

    GO TO 3.

  2. PERFORM SELF DIAGNOSTIC RESULT 
    1. SYMBOL CONSULT
      1. Erase "Self Diagnostic Result" mode of "ABS"
      2. Ignition switch OFF → ON → OFF.
        NOTE: SYMBOL Wait at least 10 seconds after placing the ignition switch OFF or ON.
      3. Start the engine.
        NOTE: SYMBOL Stop the vehicle.
      4. Depress the brake pedal several times.
      5. Ignition switch OFF.
        NOTE: SYMBOL Wait at least 10 seconds after placing the ignition switch OFF.
      6. Start the engine.
        NOTE: SYMBOL Wait at least 10 seconds after starting the engine.
      7. Repeat step 5 to 6 two or more times.
      8. Select "Self Diagnostic Result" mode of "ABS".

    Is DTC "C1116-01" detected?

    YES>>

    GO TO 3.

    NO>>

    Inspection End.

  3. STOP LAMP FOR ILLUMINATION 
    1. Depress brake pedal and check that stop lamp turns ON.

    Does stop lamp turn ON?

    YES>>

    GO TO 5.

    NO>>

    Check the stop lamp system. Refer to Wiring Diagram

    GO TO 4.

  4. CHECK DATA MONITOR (1) 
    1. SYMBOL CONSULT
      1. Erase "Self Diagnostic Result" mode of "ABS"
      2. Ignition switch OFF → ON → OFF.
        NOTE: SYMBOL Wait at least 10 seconds after placing the ignition switch OFF or ON.
      3. Start the engine.
        NOTE: SYMBOL Stop the vehicle.
      4. Select "STOP LAMP SW" in "Data Monitor" mode of "ABS", and according to this order. Check that data monitor displays "On" or "Off" when brake pedal is depressed or released. Refer to Reference Value .
      5. Select "PRESS SENSOR" in "Data Monitor" mode of "ABS", and according to this order. Depress the brake pedal and check if "PRESS SENSOR" indicates "5 bar" or less when "STOP LAMP SW" of "Data Monitor" turns from "Off" to "On".

    Is the inspection result normal?

    YES>>

    Inspection End.

    NO>>

    GO TO 5.

  5. CHECK CONNECTOR 
      1. Ignition switch OFF.
      2. Check the ABS actuator and electric unit (control unit) harness connector for disconnection or looseness.
      3. Check the stop lamp switch harness connector for disconnection or looseness.

    Is the inspection result normal?

    YES>>

    GO TO 6.

    NO>>

    Repair / replace harness or connector, and GO TO 6.

  6. CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) POWER SUPPLY AND GROUND CIRCUIT 
    1. Check the ABS actuator and electric unit (control unit) power supply and ground circuits. Refer to Diagnosis Procedure .

    Is the inspection result normal?

    YES>>

    GO TO 7.

    NO>>

    Repair / replace harness, connector, fuse, or fusible link.

  7. CHECK STOP LAMP SWITCH CLEARANCE 
      1. Ignition switch OFF.
      2. Check the stop lamp switch clearance. Refer to Inspection .

    Is the inspection result normal?

    YES>>

    GO TO 9.

    NO>>

    Adjust stop lamp switch clearance. Refer to Adjustment . GO TO 8.

  8. CHECK DATA MONITOR (2) 
    1. SYMBOL CONSULT
      1. Erase "Self Diagnostic Result" mode of "ABS"
      2. Ignition switch OFF → ON → OFF.
        NOTE: SYMBOL Wait at least 10 seconds after placing the ignition switch OFF or ON.
      3. Start the engine.
        NOTE: SYMBOL Stop the vehicle.
      4. Select "STOP LAMP SW" in "Data Monitor" mode of "ABS", and according to this order. Check that data monitor displays "On" or "Off" when brake pedal is depressed or released. Refer to Reference Value .
      5. Select "PRESS SENSOR" in "Data Monitor" mode of "ABS", and according to this order. Depress the brake pedal and check if "PRESS SENSOR" indicates "5 bar" or less when "STOP LAMP SW" of "Data Monitor" turns from "Off" to "On".

    Is the inspection result normal?

    YES>>

    Inspection End.

    NO>>

    GO TO 9.

  9. CHECK STOP LAMP SWITCH 
    1. Check the stop lamp switch. Refer to Component Inspection .

    Is the inspection result normal?

    YES>>

    GO TO 10.

    NO>>

    Replace the stop lamp switch. Refer to Exploded View . GO TO 10.

  10. CHECK DATA MONITOR (3) 
    1. SYMBOL CONSULT
      1. Erase "Self Diagnostic Result" mode of "ABS"
      2. Ignition switch OFF → ON → OFF.
        NOTE: SYMBOL Wait at least 10 seconds after placing the ignition switch OFF or ON.
      3. Start the engine.
        NOTE: SYMBOL Start the vehicle.
      4. Select "STOP LAMP SW" in "Data Monitor" mode of "ABS", and according to this order. Check that data monitor displays "On" or "Off" when brake pedal is depressed or released. Refer to Reference Value .
      5. Select "PRESS SENSOR" in "Data Monitor" mode of "ABS", and according to this order. Depress the brake pedal and check if "PRESS SENSOR" indicates "5 bar" or less when "STOP LAMP SW" of "Data Monitor" turns from "Off" to "On".

    Is the inspection result normal?

    YES>>

    Inspection End.

    NO>>

    GO TO 11.

  11. CHECK CONNECTOR AND TERMINAL 
      1. Ignition switch OFF.
      2. Disconnect ABS actuator and electric unit (control unit) harness connector.
      3. Check the ABS actuator and electric unit (control unit) harness connector for disconnection or looseness.
      4. Check the ABS actuator and electric unit (control unit) pin terminals for damage or loose connection with harness connector.
      5. Disconnect stop lamp switch harness connector.
      6. Check the stop lamp switch harness connector for disconnection or looseness.
      7. Check the stop lamp switch pin terminals for damage or loose connection with harness connector.

    Is the inspection result normal?

    YES>>

    GO TO 13.

    NO>>

    Repair / replace harness, connector, or terminal, and GO TO 12.

  12. CHECK DATA MONITOR (4) 
    1. SYMBOL CONSULT
      1. Connect ABS actuator and electric unit (control unit) harness connector.
      2. Connect stop lamp switch harness connector.
      3. Erase "Self Diagnostic Result" mode of "ABS"
      4. Ignition switch OFF → ON → OFF.
        NOTE: SYMBOL Wait at least 10 seconds after placing the ignition switch OFF or ON.
      5. Start the engine.
        NOTE: SYMBOL Stop the vehicle.
      6. Select "STOP LAMP SW" in "Data Monitor" mode of "ABS", and according to this order. Check that data monitor displays "On" or "Off" when brake pedal is depressed or released. Refer to Reference Value .
      7. Select "PRESS SENSOR" in "Data Monitor" mode of "ABS", and according to this order. Depress the brake pedal and check if "PRESS SENSOR" indicates "5 bar" or less when "STOP LAMP SW" of "Data Monitor" turns from "Off" to "On".

    Is the inspection result normal?

    YES>>

    Inspection End.

    NO>>

    GO TO 13.

  13. CHECK STOP LAMP SWITCH CIRCUIT (1) 
      1. Ignition switch OFF.
      2. Disconnect ECM harness connector.
      3. Check the voltage between ECM harness connector and ground.
        ECM - Condition Voltage(Approx.)
        Connector Terminal
        E16 149 Ground Brake pedal depressed Battery voltage
        Brake pedal not depressed 0 V
      4. Ignition switch OFF.
      5. Check the voltage between ECM harness connector and ground.
        ECM - Condition Voltage(Approx.)
        Connector Terminal
        E16 149 Ground Brake pedal depressed Battery voltage
        Brake pedal not depressed 0 V

    Is the inspection result normal?

    YES>>

    Replace the ECM. Refer to Removal and Installation .

    NO>>

    Repair / replace harness or connector, and GO TO 14.

  14. CHECK STOP LAMP SWITCH CIRCUIT (2) 
      1. Ignition switch OFF.
      2. Disconnect stop lamp switch harness connector.
      3. Check the continuity between ECM harness connector and stop lamp switch harness connector.
        ECM Stop lamp switch Continuity
        Connector Terminal Connector Terminal
        E16 149 E38 2 Yes
      4. Check the continuity between ECM harness connector and the ground.
        ECM - Continuity
        Connector Terminal
        E16 149 Ground No

    Is the inspection result normal?

    YES>>

    Replace the ECM. Refer to Removal and Installation .

    NO>>

    Repair / replace harness or connector, and GO TO 15.

  15. CHECK DATA MONITOR (5) 
    1. SYMBOL CONSULT
      1. Connect ABS actuator and electric unit (control unit) harness connector.
      2. Connect stop lamp switch harness connector.
      3. Erase "Self Diagnostic Result" mode of "ABS".
      4. Ignition switch OFF → ON → OFF.
        NOTE: SYMBOL Wait at least 10 seconds after placing the ignition switch OFF or ON.
      5. Start the engine.
        NOTE: SYMBOL Stop the vehicle.
      6. Select "STOP LAMP SW" in "Data Monitor" mode of "ABS", and according to this order. Check that data monitor displays "On" or "Off" when brake pedal is depressed or released. Refer to Reference Value .
      7. Select "PRESS SENSOR" in "Data Monitor" mode of "ABS", and according to this order. Depress the brake pedal and check if "PRESS SENSOR" indicates "5 bar" or less when "STOP LAMP SW" of "Data Monitor" turns from "Off" to "On".

    Is the inspection result normal?

    YES>>

    Inspection End.

    NO>>

    Replace the ABS actuator and electric unit (control unit). Refer to Removal and Installation .

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