2011 INFINITI QX56 brake

C1155 BRAKE FLUID LEVEL SWITCHBRC-103
< DTC/CIRCUIT DIAGNOSIS > [WITH VDC]
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C1155 BRAKE FLUID LEVEL SWITCH
DTC LogicINFOID:0000000006222625
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.CHECK DTC DETECTION
With CONSULT-III.
1. Turn the ignition switch OFF to ON, and then wait 1 minute or more.
2. Perform self-diagnosis for “ABS”.
Is DTC
“C1155” detected?
YES >> Proceed to diagnosis procedure. Refer to BRC-103, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006222626
1.CHECK BRAKE FLUID LEVEL
1. Turn the ignition switch OFF.
2. Check brake fluid level. Refer to BR-10, "
Inspection".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Refill brake fluid. Refer to BR-11, "
Refilling".
2.CHECK BRAKE FLUID LEVEL SWITCH HARNESS
1. Disconnect brake fluid level switch harness connector.
2. Disconnect ABS actuator and electric unit (control unit) harness connector.
3. Check continuity between brake fluid level switch harness connector and ABS actuator and electric unit
(control unit) harness connector.
4. Check continuity between brake fluid level switch harness connector and ground.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace error-detected parts.
3.CHECK BRAKE FLUID LEVEL SWITCH GROUND
Check continuity between brake fluid level switch harness connector and ground.
DTC Display Item Malfunction detected condition Possible causes
C1155 BR FLUID LEVEL LOW  When brake fluid level low signal is detected.
 When an open circuit is detected in brake fluid level
switch circuit.  Harness or connector
 ABS actuator and electric unit
(control unit)
 Brake fluid level switch
Brake fluid level switch ABS actuator and electric unit (control unit) Continuity
Connector Terminal Connector Terminal
E47 1 E36 13 Existed
Brake fluid level switch —Continuity
Connector Terminal
E47 1 Ground Not existed
Revision: 2010 May2011 QX56

BRC-104
< DTC/CIRCUIT DIAGNOSIS >[WITH VDC]
C1155 BRAKE FLUID LEVEL SWITCH
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair or replace error-detected parts.
4.CHECK BRAKE FLUID LEVEL SWITCH
Check brake fluids level witch. Refer to BRC-104, "
Component Inspection".
Is the inspection result normal?
YES >> GO TO 5.
NO >> Replace reservoir tank. Refer to BR-30, "
Disassembly and Assembly".
5.CHECK TERMINAL
 Check brake fluid level switch pin terminals for damage or loose connection with harness connector.
 Check ABS actuator and electric unit (control unit) pin terminals for damage or loose connection with har-
ness connector.
Is the inspection result normal?
YES >> Replace ABS actuator and electr ic unit (control unit). Refer to BRC-137, "Removal and Installa-
tion".
NO >> Repair or replace error-detected parts.
Component InspectionINFOID:0000000006222627
1.CHECK BRAKE FLUID LEVEL SWITCH
1. Turn the ignition switch OFF.
2. Disconnect brake fluid level switch harness connector.
3. Check resistance between terminals of brake fluid level switch.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace reservoir tank. Refer to BR-30, "
Disassembly and Assembly".
Brake fluid level switch
—Continuity
Connector Terminal
E47 2 Ground Existed
Brake fluid level switch Condition Resistance
Te r m i n a l
1 – 2 When brake fluid level in reservoir tank is within the specified level. 1.9 – 2.1 k
Ω
When brake fluid level in reservoir tank is less than the specified
level. 1.0
Ω or less
Revision: 2010 May2011 QX56

C118E ACCUMULATORBRC-111
< DTC/CIRCUIT DIAGNOSIS > [WITH VDC]
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C118E ACCUMULATOR
DTC LogicINFOID:0000000006222636
DTC DETECTION LOGIC
CAUTION:
The VDC warning lamp, ABS warning lamp and br ake warning lamp turns ON and DTC “C118E” may
be detected in self-diagnosis result of “ABS” when the brake pedal is excessively operated, such as
air bleeding. This is not a system malfunction because this occurs due to the temporary decrease in
accumulator fluid pressure. The system returns to normal condition when the accumulator fluid pres-
sure reaches the specified pressure with the ignition switch ON and the VDC warning lamp, ABS warn-
ing lamp, and brake warning lamp turn OFF. After these steps, ABS self-diagnosis results are erased.
Diagnosis ProcedureINFOID:0000000006222637
1.ERASE SELF-DIAGNOSIS RESULT
CAUTION:
The VDC warning lamp, ABS warning lamp and br ake warning lamp turns ON and DTC “C118E” may
be detected in self-diagnosis result of “ABS” when the brake pedal is excessively operated, such as
air bleeding. This is not a system malfunction because this occurs due to the temporary decrease in
accumulator fluid pressure. The system returns to normal condition when the accumulator fluid pres-
sure reaches the specified pressure with the ignition switch ON and the VDC warning lamp, ABS warn-
ing lamp, and brake warning lamp turn OFF. After these steps, ABS self-diagnosis results are erased.
With CONSULT-III.
1. Erase Self-diagnosis result for “ABS”.
2. Turn the ignition switch OFF.
3. Depress brake pedal to full stroke 20 times or more.
4. Start the engine, and then wait 2 minutes or more.
5. Check VDC warning lamp, ABS warning lamp and brake warning lamp turns OFF.
6. Perform self-diagnosis for “ABS”.
Is any DTC detected?
YES >> Check the DTC. Refer to BRC-51, "DTC Index".
NO >> INSPECTION END
DTC Display Item Malfunction detected condition Possible causes
C118E ACCUMULATOR PRESS When performing excessive brake pedal operation
with the vehicle stopped. [When accumulator fluid
pressure reaches 11.43 MPa (114 bar, 116.6 kg/cm
2,
1657 psi) after reaching 17.3 MPa (173 bar, 176.5 kg/
cm
2, 2509 psi.] —
Revision: 2010 May2011 QX56

PARKING BRAKE SWITCHBRC-117
< DTC/CIRCUIT DIAGNOSIS > [WITH VDC]
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PARKING BRAKE SWITCH
Component Function CheckINFOID:0000000006222643
1.CHECK PARKING BRA KE SWITCH OPERATION
Check that brake warning lamp in combination meter turns ON/OFF when parking brake is operated.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Proceed to diagnosis procedure. Refer to BRC-117, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000006222644
1.CHECK PARKING BRAKE SWITCH CIRCUIT
1. Turn the ignition switch OFF.
2. Disconnect parking brake switch harness connector.
3. Disconnect combination meter harness connector.
4. Check continuity between parking brake switch harness connector and combination meter harness con-
nector.
5. Check continuity between parking brake switch harness connector and ground.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace error-detected parts.
2.CHECK PARKING BRAKE SWITCH
Check parking brake switch. Refer to BRC-118, "
Component Inspection".
Is the inspection result normal?
YES >> GO TO 3.
NO >> Replace parking brake switch. Refer to PB-5, "
Removal and Installation".
3.CHECK PARKING BRAKE SWITCH SIGNAL
With CONSULT-III.
1. Connect parking brake switch harness connector.
2. Connect combination meter harness connector.
3. Select “ABS”, “DATA MONITOR” and “PARK BRAKE SW ” according to this order. Check parking brake
switch signal.
Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 4.
4.CHECK COMBINATION METER
Check combination meter. Refer to MWI-30, "
CONSULT-III Function".
Parking brake switch Combination meter
Continuity
Connector Terminal Connector Terminal
M11 1 M34 26 Existed
Parking brake switch —Continuity
Connector Terminal
M11 1 Ground Not existed
Condition DATA MONITOR
Operate parking brake On
Release the parking brake Off
Revision: 2010 May2011 QX56

BRC-118
< DTC/CIRCUIT DIAGNOSIS >[WITH VDC]
PARKING BRAKE SWITCH
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair or replace combination meter. Refer to
MWI-85, "
Removal and Installation".
5.CHECK TERMINAL
 Check combination meter pin terminals for damage or loose connection with harness connector.
 Check parking brake switch pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?
YES >> Replace ABS actuator and electr ic unit (control unit). Refer to BRC-137, "Removal and Installa-
tion".
NO >> Repair or replace error-detected parts.
Component InspectionINFOID:0000000006222645
1.CHECK PARKING BRAKE SWITCH
1. Turn the ignition switch OFF.
2. Disconnect parking brake switch harness connector.
3. Check continuity between parking brake switch terminal and ground.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace parking brake switch. Refer to PB-5, "
Removal and Installation".
Parking brake switch
— Condition Continuity
Te r m i n a l
1Ground When parking brake switch is pressed Existed
When parking brake switch is released Not existed
Revision: 2010 May2011 QX56

BRAKE WARNING LAMPBRC-123
< DTC/CIRCUIT DIAGNOSIS > [WITH VDC]
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BRAKE WARNING LAMP
Component Function CheckINFOID:0000000006222651
1.CHECK BRAKE WARNING LAMP FUNCTION (1)
Check that brake warning lamp in combination meter turns ON for approx. 1 second after ignition switch is
turned ON.
CAUTION:
Never start engine.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Proceed to diagnosis procedure. Refer to BRC-123, "
Diagnosis Procedure".
2.CHECK BRAKE WARNING LAMP FUNCTION (2)
Check that brake warning lamp in combination meter turns ON/OFF when parking brake is operated.
NOTE:
Brake warning lamp turns ON when parking brake is operated (when parking brake switch is ON).
Is the inspection result normal?
YES >> GO TO 3.
NO >> Check parking brake switch system. Refer to BRC-117, "
Diagnosis Procedure".
3.CHECK BRAKE WARNING LAMP FUNCTION (3)
Check that brake warning lamp in combination meter turns ON/OFF when brake fluid level switch is operated
while brake fluid level in reservoir tank is with the specified level.
NOTE:
Brake warning lamp turns ON when brake fluid is less than the specified level (when brake fluid level switch is
ON).
Is the inspection result normal?
YES >> INSPECTION END
NO >> Check brake fluid level switch system. Refer to BRC-103, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000006222652
1.CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) POWER SUPPLY AND GROUND CIR-
CUIT
Perform the trouble diagnosis for ABS actuator and elec tric unit (control unit) power supply and ground circuit.
Refer to BRC-113, "
Diagnosis Procedure".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace error-detected parts.
2.PERFORM THE SELF-DIAGNOSIS
With CONSULT-III.
Perform self-diagnosis for “ABS”.
Is any DTC detected?
YES >> Check the DTC. Refer to BRC-51, "DTC Index".
NO >> GO TO 3.
3.CHECK BRAKE WARNING LAMP SIGNAL
With CONSULT-III.
1. Select “ABS”, “DATA MONITOR” and “EBD WARN LAMP” according to this order.
2. Turn the ignition switch OFF.
3. Check that data monitor displays “On” for approx. 1 second after ignition switch is turned ON and then changes to “Off”.
CAUTION:
Never start engine.
Is the inspection result normal?
Revision: 2010 May2011 QX56

BRC-124
< DTC/CIRCUIT DIAGNOSIS >[WITH VDC]
BRAKE WARNING LAMP
YES >> GO TO 4.
NO >> Replace ABS actuator and electric unit (control unit). Refer to
BRC-137, "
Removal and Installa-
tion".
4.CHECK COMBINATION METER
Check combination meter. Refer to MWI-30, "
CONSULT-III Function".
Is the inspection result normal?
YES >> Replace ABS actuator and electr ic unit (control unit). Refer to BRC-137, "Removal and Installa-
tion".
NO >> Repair or replace combination meter. Refer to MWI-85, "
Removal and Installation".
Revision: 2010 May2011 QX56

EXCESSIVE OPERATION FREQUENCYBRC-127
< SYMPTOM DIAGNOSIS > [WITH VDC]
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SYMPTOM DIAGNOSIS
EXCESSIVE OPERATION FREQUENCY
DescriptionINFOID:0000000006222657
VDC function, TCS function, ABS functi on, EBD function, hill start assist function and brake limited slip differ-
ential (BLSD) function operates in excessive operation frequency.
Diagnosis ProcedureINFOID:0000000006222658
1.CHECK BRAKING FORCE
Check brake force using a brake tester.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Check brake system.
2.CHECK FRONT AND REAR AXLE
Check that there is no excessive looseness in front and rear axle.
 Front axle: Refer to FA X - 7 , "
Inspection" (2WD), FAX-16, "Inspection" (4WD).
 Rear axle: Refer to RAX-5, "
Inspection"
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace error-detected parts.
3.CHECK WHEEL SENSOR
Check wheel sensor.
 Check installation and damage of wheel sensor.
 Check connection of wheel sensor harness connector.
 Check terminal of wheel sensor harness connector.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair or replace wheel sensor.  Front wheel sensor: Refer to BRC-134, "
FRONT WHEEL SENSOR : Removal and Installation".
 Rear wheel sensor: Refer to BRC-135, "
REAR WHEEL SENSOR : Removal and Installation".
4.CHECK WARNING LAMP TURNS OFF
Check that ABS warning lamp, brake warning lamp and VDC warning lamp turn OFF approx. 1 second after
key switch is turned ON and stay in OFF status during driving.
CAUTION:
Brake warning lamp turns ON when parking brake is operated (parking brake switch is ON) or brake
fluid is less than the specified level (brake fluid level switch is ON).
Is the inspection result normal?
YES >> Normal
NO >> Perform self-diagnosis for “ABS” with CONSULT-III.
Revision: 2010 May2011 QX56