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Home >> Infiniti >> 2015 >> Q50 Base, RWD >> Repair and Diagnosis >> Brakes >> Anti-Lock Brakes >> Brake Control System (VDC - Diagnostic Trouble Codes (DTCS) Symptom Tests And Component R&R) (Exc Hybrid) >> DTC/Circuit Diagnosis >> DTC C1155: Brake Fluid Level Switch >> Diagnosis Procedure >> Diagnostic Test

Diagnostic Test

  1. CHECK CONNECTOR

    1. Turn the ignition switch OFF.
    2. Check the combination meter harness connector for disconnection or looseness.
    3. Check the brake fluid level switch harness connector for disconnection or looseness.

    Is the inspection result normal?

    YES 

    GO TO STEP 3  .

    NO 

    Repair / replace harness or connector, and GO TO STEP 2  .

  2. PERFORM SELF-DIAGNOSIS (1)

    With CONSULT

    1. Turn the ignition switch OFF → ON.
      CAUTION:
      • Be sure to wait of 10 seconds after turning ignition switch OFF or ON.
      • Start the engine.
    2. Repeat step 1 two or more times.
    3. Perform self-diagnosis for "ABS".

    Is DTC "C1155" detected?

    YES 

    GO TO STEP 3  .

    NO 

    INSPECTION END

  3. CHECK BRAKE FLUID LEVEL

    1. Turn the ignition switch OFF.
    2. Check the brake fluid level. Refer to INSPECTION .

    Is the inspection result normal?

    YES 

    GO TO STEP 5  .

    NO 

    Refill brake fluid. Refer to REFILLING . GO TO STEP 4  .

  4. PERFORM SELF-DIAGNOSIS (2)

    With CONSULT

    1. Erase self-diagnosis result for "ABS".
    2. Turn the ignition switch OFF → ON → OFF.
      CAUTION:

      Be sure to wait of 10 seconds after turning ignition switch OFF or ON.

    3. Turn the ignition switch OFF → ON.
      CAUTION:
      • Be sure to wait of 10 seconds after turning ignition switch OFF or ON.
      • Start the engine.
    4. Repeat step 3 two or more times.
    5. Perform self-diagnosis for "ABS".

    Is DTC "C1155" detected?

    YES 

    GO TO STEP 5  .

    NO 

    INSPECTION END

  5. CHECK BRAKE FLUID LEVEL SWITCH

    Check the brake fluids level switch. Refer to COMPONENT INSPECTION .

    Is the inspection result normal?

    YES 

    GO TO STEP 7  .

    NO 

    Replace the reservoir tank. Refer to DISASSEMBLY AND ASSEMBLY . GO TO STEP 6  .

  6. PERFORM SELF-DIAGNOSIS (3)

    With CONSULT

    1. Erase self-diagnosis result for "ABS".
    2. Turn the ignition switch OFF → ON → OFF.
      CAUTION:

      Be sure to wait of 10 seconds after turning ignition switch OFF or ON.

    3. Turn the ignition switch OFF → ON.
      CAUTION:
      • Be sure to wait of 10 seconds after turning ignition switch OFF or ON.
      • Start the engine.
    4. Repeat step 3 two or more times.
    5. Perform self-diagnosis for "ABS".

    Is DTC "C1155" detected?

    YES 

    GO TO STEP 7  .

    NO 

    INSPECTION END

  7. CHECK CONNECTOR AND TERMINAL

    1. Turn the ignition switch OFF.
    2. Disconnect brake fluid level switch harness connector.
    3. Check the brake fluid level switch harness connector for disconnection or looseness.
    4. Check the brake fluid level switch pin terminals for damage or loose connection with harness connector.
    5. Disconnect combination meter harness connector.
    6. Check the combination meter harness connector for disconnection or looseness.
    7. Check the combination meter pin terminals for damage or loose connection with harness connector.

    Is the inspection result normal?

    YES 

    GO TO STEP 9  .

    NO 

    Repair / replace harness, connector, or terminal, and GO TO STEP 8  .

  8. PERFORM SELF-DIAGNOSIS (4)

    With CONSULT

    1. Erase self-diagnosis result for "ABS".
    2. Turn the ignition switch OFF → ON → OFF.
      CAUTION:

      Be sure to wait of 10 seconds after turning ignition switch OFF or ON.

    3. Turn the ignition switch OFF → ON.
      CAUTION:
      • Be sure to wait of 10 seconds after turning ignition switch OFF or ON.
      • Start the engine.
    4. Repeat step 3 two or more times.
    5. Perform self-diagnosis for "ABS".

    Is DTC "C1155" detected?

    YES 

    GO TO STEP 9  .

    NO 

    INSPECTION END

  9. CHECK BRAKE FLUID LEVEL SWITCH CIRCUIT

    1. Turn the ignition switch OFF.
    2. Disconnect brake fluid level switch harness connector.
    3. Disconnect combination meter harness connector.
    4. Check the continuity between brake fluid level switch harness connector and combination meter harness connector.
      Brake fluid level switch Combination meter Continuity
      Connector Terminal Connector Terminal
      E4 1 M57 25 Existed
    5. Check the continuity between brake fluid level switch harness connector and ground.
      Brake fluid level switch - Continuity
      Connector Terminal
      E4 1 Ground Not existed

    Is the inspection result normal?

    YES 

    GO TO STEP 10  .

    NO 

    Repair / replace harness or connector, and GO TO STEP 10  .

  10. CHECK BRAKE FLUID LEVEL SWITCH GROUND CIRCUIT

    Check the continuity between brake fluid level switch harness connector and ground.

    Brake fluid level switch - Continuity
    Connector Terminal
    E4 2 Ground Existed

    Is the inspection result normal?

    YES 

    GO TO STEP 11  .

    NO 

    Repair / replace harness or connector, and GO TO STEP 11  .

  11. CHECK COMBINATION METER

    Check the combination meter. Refer to CONSULT FUNCTION .

    Is the inspection result normal?

    YES 

    Replace the ABS actuator and electric unit (control unit). Refer to REMOVAL AND INSTALLATION .

    NO 

    Repair or replace combination meter. Refer to REMOVAL AND INSTALLATION .

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