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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 36 (Brake Control System (W/ Intelligent Cruise Control) (2 Of 2)) >> DTC/Circuit Diagnosis >> C1155 Brake Fluid Level Switch >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2018 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
  1. 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 3 .

    NO

    Refill brake fluid. Refer to Drain and Refill . GO TO 2 .

  2. PERFORM SELF-DIAGNOSIS (1) 

    SYMBOL CONSULT

    1. Erase "Self Diagnostic Result" of mode "ABS".
    2. Turn the ignition switch OFF → ON → OFF.
      NOTE: Wait at least 10 seconds after turning ignition switch OFF or ON.
    3. Start the engine.
      NOTE: Wait at least 10 seconds after starting the engine.
    4. Select "Self Diagnostic Result" mode of "ABS".

    Is DTC "C1155" detected?

    YES

    GO TO 3 .

    NO

    Inspection End.

  3. 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 5 .

    NO

    Repair / replace harness or connector. GO TO 4 .

  4. PERFORM SELF-DIAGNOSIS (2) 

    SYMBOL CONSULT

    1. Turn the ignition switch OFF.
      NOTE: Wait at least 10 seconds after turning ignition switch OFF.
    2. Start the engine.
      NOTE: Wait at least 10 seconds after starting the engine.
    3. Select "Self Diagnostic Result" mode of "ABS".

    Is DTC "C1155" detected?

    YES

    GO TO 5 .

    NO

    Inspection End.

  5. CHECK BRAKE FLUID LEVEL SWITCH 

    Check the brake fluid level switch. Refer to Component Inspection .

    Is the inspection result normal?

    YES

    GO TO 7 .

    NO

    Replace the reservoir tank. Refer to Exploded View . GO TO 6 .

  6. PERFORM SELF-DIAGNOSIS (3) 

    SYMBOL CONSULT

    1. Erase "Self Diagnostic Result" mode of "ABS"
    2. Turn the ignition switch OFF → ON → OFF.
      NOTE: Wait at least 10 seconds after turning ignition switch OFF or ON.
    3. Start the engine.
      NOTE: Wait at least 10 seconds after starting the engine.
    4. Select "Self Diagnostic Result" mode of "ABS".

    Is DTC "C1155" detected?

    YES

    GO TO 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 9 .

    NO

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

  8. PERFORM SELF-DIAGNOSIS (4) 

    SYMBOL CONSULT

    1. Erase "Self Diagnostic Result" mode of "ABS".
    2. Turn the ignition switch OFF → ON → OFF.
      NOTE: Wait at least 10 seconds after turning ignition switch OFF or ON.
    3. Start the engine.
      NOTE: Wait at least 10 seconds after starting the engine.
    4. Select "Self Diagnostic Result" mode of "ABS".

    Is DTC "C1155" detected?

    YES

    GO TO 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

      E24

      1

      M24

      25

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

      Brake fluid level switch

      -

      Continuity

      Connector

      Terminal

      E24

      1

      Ground

      No

    Is the inspection result normal?

    YES

    GO TO 10 .

    NO

    Repair / replace harness or connector. GO TO 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

    E24

    2

    Ground

    Yes

    Is the inspection result normal?

    YES

    GO TO 11 .

    NO

    Repair / replace harness or connector. GO TO 11 .

  11. CHECK COMBINATION METER 

    Check the combination meter. Refer to CONSULT Function (METER/M&A) .

    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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