2011 INFINITI QX56 air condition

BRC-100
< DTC/CIRCUIT DIAGNOSIS >[WITH VDC]
C1145, C1146 YAW RATE/SIDE/DECEL G SENSOR
C1145, C1146 YAW RATE/SIDE/DECEL G SENSOR
DTC LogicINFOID:0000000006222623
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.CHECK DTC DETECTION
With CONSULT-III.
1. Turn the ignition switch OFF to ON.
2. Perform self-diagnosis for “ABS”.
Is DTC
“C1145” or “C1146” detected?
YES >> Proceed to diagnosis procedure. Refer to BRC-100, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006222624
CAUTION:
 A malfunction in yaw rate/side/ decel G sensor system may be det ected when the vehicle sharply
turns during a spin turn, acceleratio n turn or drift driving while VDC function is OFF (VDC OFF indi-
cator lamp is in ON status). This is not a malfun ction if the status returns to normal after engine is
started again. In that case, erase self-diagn osis result memory using CONSULT-III.
 When the engine is in running stat us and the vehicle is on a turntable at the entrance of parking lot
or on a moving unit, VDC warning lamp may tu rn ON and “ABS” self-diagnosis may display “YAW
RATE SENSOR”. In this case, yaw rate sensor is not malfunctioning. The status returns to normal
when the vehicle is left from the turntable or movi ng unit and the engine is started again. In that
case, erase self-diagnosis result memory using CONSULT-III.
1.CHECK YAW RATE/SIDE/DECEL G SENSOR MOUNTING CONDITION
Check yaw rate/side/decel G sensor mounting condition. Refer to BRC-138, "
Exploded View".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace error-detected parts.
2.CHECK YAW RATE/SIDE/DECE L G SENSOR POWER SUPPLY
1. Turn the ignition switch OFF.
2. Disconnect yaw rate/side/decel G sensor harness connector.
3. Check voltage between yaw rate/side/dec el G sensor harness connector and ground.
4. Turn the ignition switch ON. CAUTION:
Never start engine.
5. Check voltage between yaw rate/side/dec el G sensor harness connector and ground.
DTC Display Item Malfunction detected condition Possible causes
C1145 YAW RATE SENSOR  When a malfunction is detected in yaw rate signal.
 When yaw rate signal is not continuously received
for 2 seconds or more.
 When side G signal is not continuously received for 2 seconds or more.
 When decel G signal is not continuously received for 2 seconds or more.  Harness or connector
 Yaw rate/side/decel G sensor
 ABS actuator and electric unit
(control unit)
 Ignition power supply system
Fuse
C1146 SIDE G-SEN CIRCUIT When a malfunction is detected in side/decel G sig-
nal.
Yaw rate/side/decel G sensor
—Voltage
Connector Terminal
M55 3 Ground Approx. 0 V
Revision: 2010 May2011 QX56

C1155 BRAKE FLUID LEVEL SWITCHBRC-103
< DTC/CIRCUIT DIAGNOSIS > [WITH VDC]
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G H
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M A
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BRC
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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

C1160 DECEL G SEN SETBRC-105
< DTC/CIRCUIT DIAGNOSIS > [WITH VDC]
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BRC
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C1160 DECEL G SEN SET
DTC LogicINFOID:0000000006222628
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.CHECK DTC DETECTION
With CONSULT-III.
1. Turn the ignition switch OFF to ON.
2. Perform self-diagnosis for “ABS”.
Is DTC
“C1160” detected?
YES >> Proceed to diagnosis procedure. Refer to BRC-105, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006222629
1.DECEL G SENSOR CALIBRATION
Perform decel G sensor calibration. Refer to BRC-66, "
Work Procedure".
>> GO TO 2.
2.CHECK ABS SCTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
With CONSULT-III.
Perform self-diagnosis for “ABS”.
Is DTC
“C1160” detected?
YES >> GO TO 3.
NO >> INSPECTION END
3.CHECK YAW RATE/SIDE/DECEL G SENSOR SYSTEM
1. Turn the ignition switch OFF.
2. Check yaw rate/side/decel G sensor system. Refer to BRC-100, "
Diagnosis Procedure".
Is the inspection result normal?
YES >> Replace ABS actuator and electric unit (control unit). Refer to BRC-137, "Removal and Installa-
tion".
NO >> Repair or replace error-detected parts.
DTC Display Item Malfunction detected condition Possible causes
C1160 DECEL G SEN SET When calibration of yaw rate/side/decal G sensor is
not complete.  Yaw rate/side/decel G sensor
 Harness or connector
 ABS actuator and electric unit
(control unit)
 Decel G sensor calibration is
not performed
Revision: 2010 May2011 QX56

BRC-106
< DTC/CIRCUIT DIAGNOSIS >[WITH VDC]
C1164, C1165 CV SYSTEM
C1164, C1165 CV SYSTEM
DTC LogicINFOID:0000000006222630
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.CHECK DTC DETECTION
With CONSULT-III.
1. Turn the ignition switch OFF to ON.
2. Perform self-diagnosis for “ABS”.
Is DTC
“C1164” or “C1165” detected?
YES >> Proceed to diagnosis procedure. Refer to BRC-106, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006222631
1.CHECK CUT VALVE POWER SUPPLY
1. Turn the ignition switch OFF.
2. Disconnect ABS actuator and electric unit (control unit) harness connector.
3. Check voltage between ABS actuator and electr ic unit (control unit) harness connector and ground.
4. Turn the ignition switch ON. CAUTION:
Never start engine.
5. Check voltage between ABS actuator and electr ic unit (control unit) harness connector and ground.
Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 2.
2.CHECK CUT VALVE POWER SUPPLY CIRCUIT
1. Turn the ignition switch OFF.
2. Check 30A fusible link (L).
3. Check continuity and short circui t between ABS actuator and electric unit (control unit) harness connector
terminal (1) and 30A fusible link (L).
Is the inspection result normal?
YES >> Perform trouble diagnosis for battery power supply. Refer to PG-11, "Wiring Diagram - BATTERY
POWER SUPPLY -".
NO >> Repair or replace error-detected parts.
3.CHECK CUT VALVE GROUND CIRCUIT
DTC Display Item Malfunction detected condition Possible causes
C1164 CV 1 When a malfunction is detected in cut valve 1.  Harness or connector  ABS actuator and electric unit
(control unit)
 Fusible link
 Battery power supply system
C1165 CV 2 When a malfunction is detected in cut valve 2.
ABS actuator and electric
unit (control unit)
—Voltage
Connector Terminal
E36 1 Ground Battery voltage
ABS actuator and electric unit (control unit) —Voltage
Connector Terminal
E36 1 Ground Battery voltage
Revision: 2010 May2011 QX56

BRC-108
< DTC/CIRCUIT DIAGNOSIS >[WITH VDC]
C1166, C1167 SV SYSTEM
C1166, C1167 SV SYSTEM
DTC LogicINFOID:0000000006222632
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.CHECK DTC DETECTION
With CONSULT-III.
1. Turn the ignition switch OFF to ON.
2. Perform self-diagnosis for “ABS”.
Is DTC
“C1166” or “C1167” detected?
YES >> Proceed to diagnosis procedure. Refer to BRC-108, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006222633
1.CHECK SUCTION VALVE POWER SUPPLY
1. Turn the ignition switch OFF.
2. Disconnect ABS actuator and electric unit (control unit) harness connector.
3. Check voltage between ABS actuator and electr ic unit (control unit) harness connector and ground.
4. Turn the ignition switch ON. CAUTION:
Never start engine.
5. Check voltage between ABS actuator and electr ic unit (control unit) harness connector and ground.
Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 2.
2.CHECK SUCTION VALVE POWER SUPPLY CIRCUIT
1. Turn the ignition switch OFF.
2. Check 30A fusible link (L).
3. Check continuity and short circui t between ABS actuator and electric unit (control unit) harness connector
terminal (1) and 30A fusible link (L).
Is the inspection result normal?
YES >> Perform trouble diagnosis for battery power supply. Refer to PG-11, "Wiring Diagram - BATTERY
POWER SUPPLY -".
NO >> Repair or replace error-detected parts.
3.CHECK SUCTION VALVE GROUND CIRCUIT
DTC Display Item Malfunction detected condition Possible causes
C1166 SV 1 When a malfunction is detected in suction valve 1.  Harness or connector  ABS actuator and electric unit
(control unit)
 Fusible link
 Battery power supply system
C1167 SV 2 When a malfunction is detected in suction valve 2.
ABS actuator and electric
unit (control unit)
—Voltage
Connector Terminal
E36 1 Ground Battery voltage
ABS actuator and electric unit (control unit)
—Voltage
Connector Terminal
E36 1 Ground Battery voltage
Revision: 2010 May2011 QX56

C118E ACCUMULATORBRC-111
< DTC/CIRCUIT DIAGNOSIS > [WITH VDC]
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BRC
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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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BRC
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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