Nissan Murano: Dtc/circuit Diagnosis / C1155 Brake Fluid Level Switch

Nissan Murano (Z52) 2015-2024 Service Manual / Brakes / Brake Control System :: Vdc/tcs/abs / Dtc/circuit Diagnosis / C1155 Brake Fluid Level Switch

DTC Description

DTC DETECTION LOGIC

DTC No.

CONSULT screen items

(Trouble diagnosis content) 		DTC detection condition
C1155

BR FLUID LEVEL LOW

(Brake fluid level low) 		1 Diagnosis condition

  • When ignition switch ON.

  • When power supply voltage is normal.
Signal (terminal) Brake fluid level switch signal
Threshold When brake fluid level low signal is detected.
Diagnosis delay time 10 seconds
2 Diagnosis condition

  • When ignition switch ON.

  • When power supply voltage is normal.
Signal (terminal) Brake fluid level switch signal
Threshold When an open circuit is detected in brake fluid level switch circuit.
Diagnosis delay time 10 seconds

POSSIBLE CAUSE

NOTE:

Confirm if DTC is PAST or CRNT. If DTC is CRNT, proceed with Diagnosis Procedure. If DTC is PAST, clear DTC. Do not replace the ABS actuator and electric unit (control unit) for a PAST DTC.

PAST DTC CRNT DTC

  • Harness or connector

  • Brake fluid level is low

  • Harness or connector

  • ABS actuator and electric unit (control unit)

  • Brake fluid level switch

  • Combination meter

  • Brake fluid level is low

FAIL-SAFE

The following functions are suspended:

  • VDC function

  • TCS function

  • Brake assist function

  • Hill start assist function

DTC Confirmation Procedure

PRECONDITIONING

If “DTC CONFIRMATION PROCEDURE” has been previously conducted, always ignition switch OFF and wait at least 10 seconds before conducting the next test.

>>

GO TO 2.

CHECK DTC DETECTION

CONSULT

  1. Ignition switch OFF.

    NOTE:

    Wait at least 10 seconds after ignition switch OFF.

  2. Start the engine.

    NOTE:

    Wait at least 10 seconds after start the engine.

  3. Select “Self Diagnostic Result” mode of “ABS”.

Is DTC “C1155” detected?

YES>>

“CRNT” is displayed: Proceed to DTC Diagnosis Procedure.

YES>>

“PAST” is displayed: Inspection End (Erase the memory of “Self Diagnostic Result” mode of “ABS”.)

NO>>

To check malfunction symptom before repair: Refer to Intermittent Incident.

NO>>

Confirmation after repair: Inspection End.

Diagnosis Procedure

CHECK BRAKE FLUID LEVEL

  1. 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.

PERFORM SELF DIAGNOSTIC RESULT (1)

CONSULT

  1. Erase the memory of “Self Diagnostic Result” mode of “ABS”.

  2. Ignition switch OFF → ON → OFF.

    NOTE:

    Wait at least 10 seconds after ignition switchh OFF or ON.

  3. Start the engine.

    NOTE:

    Wait at least 10 seconds after start the engine.

  4. Select “Self Diagnostic Result” mode of “ABS”.

Is DTC “C1155” detected?

YES>>

GO TO 3.

NO>>

Inspection End.

CHECK CONNECTOR

  1. 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, and GO TO 4.

PERFORM SELF DIAGNOSTIC RESULT (2)

CONSULT

  1. Ignition switch OFF.

    NOTE:

    Wait at least 10 seconds after ignition switchh OFF.

  2. Start the engine.

    NOTE:

    Wait at least 10 seconds after start the engine.

  3. Select “Self Diagnostic Result” mode of “ABS”.

Is DTC “C1155” detected?

YES>>

GO TO 5.

NO>>

Inspection End.

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.

PERFORM SELF DIAGNOSTIC RESULT (3)

CONSULT

  1. Erase the memory of “Self Diagnostic Result” mode of “ABS”.

  2. Ignition switch OFF → ON → OFF.

    NOTE:

    Wait at least 10 seconds after ignition switchh OFF or ON.

  3. Start the engine.

    NOTE:

    Wait at least 10 seconds after start the engine.

  4. Select “Self Diagnostic Result” mode of “ABS”.

Is DTC “C1155” detected?

YES>>

GO TO 7.

NO>>

Inspection End.

CHECK CONNECTOR AND TERMINAL

  1. 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, and GO TO 8.

PERFORM SELF DIAGNOSTIC RESULT (4)

CONSULT

  1. Erase the memory of “Self Diagnostic Result” mode of “ABS”.

  2. Ignition switch OFF → ON → OFF.

    NOTE:

    Wait at least 10 seconds after ignition switchh OFF or ON.

  3. Start the engine.

    NOTE:

    Wait at least 10 seconds after start the engine.

  4. Select “Self Diagnostic Result” mode of “ABS”.

Is DTC “C1155” detected?

YES>>

GO TO 9.

NO>>

Inspection End.

CHECK BRAKE FLUID LEVEL SWITCH CIRCUIT

  1. 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
    E21 1 M24 25 Yes

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

    Brake fluid level switch — Continuity
    Connector Terminal
    E21 1 Ground No

Is the inspection result normal?

YES>>

GO TO 10.

NO>>

Repair / replace harness or connector, and GO TO 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
E21 2 Ground Yes

Is the inspection result normal?

YES>>

GO TO 11.

NO>>

Repair / replace harness or connector, and GO TO 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.

Component Inspection

CHECK BRAKE FLUID LEVEL SWITCH

  1. Ignition switch OFF.

  2. Disconnect brake fluid level switch harness connector.

  3. Check the continuity between terminals of brake fluid level switch.

    Brake fluid level switch Condition Continuity
    Terminals
    1 2 When brake fluid level in reservoir tank is within the specified level. No
    When brake fluid level in reservoir tank is less than the specified level. Yes

Is the inspection result normal?

YES>>

Inspection End.

NO>>

Replace the reservoir tank. Refer to Exploded View.

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