2011 INFINITI QX56 ABS

BRC-70
< DTC/CIRCUIT DIAGNOSIS >[WITH VDC]
C1105, C1106, C1107,
C1108 WHEEL SENSOR
C1105, C1106, C1107, C1108 WHEEL SENSOR
DTC LogicINFOID:0000000006222594
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.CHECK DTC DETECTION
With CONSULT-III.
1. Start engine and drive vehicle at approx. 30 km/h (19 MPH) or more for approx. 1 minute.
2. Perform self-diagnosis for “ABS”.
Is DTC
“C1105”, “C1106”, “C1107” or “C1108” detected?
YES >> Proceed to diagnosis procedure. Refer to BRC-70, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006222595
CAUTION:
Never check between wheel sensor harness connector terminals.
1.CHECK WHEEL SENSOR HARNESS
1. Turn the ignition switch OFF.
2. Disconnect ABS actuator and electric unit (control unit) harness connector.
3. Disconnect wheel sensor harness connector.
4. Check continuity between ABS actuator and electr ic unit (control unit) harness connector and the ground.
DTC Display Item Malfunction detected condition Possible causes
C1105 RR RH SENSOR-2  When power supply voltage of rear RH wheel sen-
sor is low.
 When distance between rear RH wheel sensor and rear RH wheel sensor rotor is large.
 When installation of rear RH wheel sensor or rear
RH wheel sensor rotor is not normal.
 Harness or connector
 Wheel sensor
 ABS actuator and electric unit (control unit)
 Sensor rotor
C1106 RR LH SENSOR-2
 When power supply voltage of rear LH wheel sen-
sor is low.
 When distance between rear LH wheel sensor and
rear LH wheel sensor rotor is large.
 When installation of rear LH wheel sensor or rear LH wheel sensor rotor is not normal.
C1107 FR RH SENSOR-2  When power supply voltage of front RH wheel sen-
sor is low.
 When distance between front RH wheel sensor and front RH wheel sensor rotor is large.
 When installation of front RH wheel sensor or front RH wheel sensor rotor is not normal.
C1108 FR LH SENSOR-2  When power supply voltage of front LH wheel sen-
sor is low.
 When distance between front LH wheel sensor and
front LH wheel sensor rotor is large.
 When installation of front LH wheel sensor or front LH wheel sensor rotor is not normal.
Revision: 2010 May2011 QX56

C1105, C1106, C1107, C1108 WHEEL SENSOR
BRC-71
< DTC/CIRCUIT DIAGNOSIS > [WITH VDC]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace error-detected parts.
2.CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) POWER SUPPLY SYSTEM
Check ABS actuator and electric unit (cont rol unit) power supply system. Refer to BRC-113, "
Diagnosis Proce-
dure".
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace error-detected parts.
3.CHECK WHEEL SENSOR
Check wheel sensor for damage, disconnection or looseness.
 Front wheel sensor: Refer to BRC-134, "
FRONT WHEEL SENSOR : Exploded View".
 Rear wheel sensor: Refer to BRC-135, "
REAR WHEEL SENSOR : Exploded View".
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair 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 TERMINAL
 Check ABS actuator and electric unit (control unit) pin terminals for damage or loose connection with har-
ness connector.
 Check each wheel sensor pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair or replace error-detected parts.
5.REPLACE WHEEL SENSOR
With CONSULT-III.
1. Connect ABS actuator and electric unit (control unit) harness connector.
2. Replace wheel sensor. Refer to BRC-134, "
FRONT WHEEL SENSOR : Removal and Installation" (front),
BRC-135, "
REAR WHEEL SENSOR : Removal and Installation" (rear).
3. Erase Self-diagnosis result for “ABS”.
4. Start the engine. Drive the vehicle at vehicle s peed of approx. 30 km/h (19 MPH) for approx. 1 minute.
5. Perform self-diagnosis for “ABS”.
Is DTC
“C1105”, “C1106”, “C1107” or “C1108” detected?
YES >> Replace ABS actuator and electric unit (control unit). Refer to BRC-137, "Removal and Installa-
tion".
NO >> INSPECTION END
ABS actuator and electric unit (control unit) —Continuity
Connector Terminal
E36 20, 34
Ground Not existed
33, 19
22, 36
35, 21
Revision: 2010 May2011 QX56

BRC-72
< DTC/CIRCUIT DIAGNOSIS >[WITH VDC]
C1109 POWER AND
GROUND SYSTEM
C1109 POWER AND GROUND SYSTEM
DescriptionINFOID:0000000006222596
Ignition power supply is supplied to ABS actuator and electric unit (control unit).
DTC LogicINFOID:0000000006222597
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.CHECK DTC DETECTION
With CONSULT-III.
1. Start the engine. Drive the vehicle at vehicle speed of approx. 10 km/h (6 MPH) or more for approx. 10
seconds.
2. Perform self-diagnosis for “ABS”
Is DTC
“C1109” detected?
YES >> Proceed to diagnosis procedure. Refer to BRC-72, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006222598
1.CHECK ABS ACTUATOR AND ELECTRIC UNIT (C ONTROL UNIT) IGNITION POWER SUPPLY (1)
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 ABS ACTUATOR AND ELECTRIC UNIT (CON TROL UNIT) IGNITION POWER SUPPLY CIRCUIT
(1)
1. Turn the ignition switch OFF.
2. Check 10A fuse (#57).
3. Disconnect IPDM E/R harness connector.
DTC Display Item Malfunction detected condition Possible causes
C1109 BATTERY VOLTAGE
[ABNORMAL]  When ignition voltage is 10 V or less.
 When ignition voltage is 16 V or more.  Harness or connector
 ABS actuator and electric unit
(control unit)
Fuse
 Ignition power supply system
 Battery
ABS actuator and electric unit (control unit) —Voltage
Connector Terminal
E36 18 Ground Approx. 0 V
ABS actuator and electric unit (control unit) —Voltage
Connector Terminal
E36 18 Ground 10 − 16 V
Revision: 2010 May2011 QX56

C1109 POWER AND GROUND SYSTEMBRC-73
< DTC/CIRCUIT DIAGNOSIS > [WITH VDC]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
4. Check continuity between ABS actuator and electr ic unit (control unit) harness connector and IPDM E/R
harness connector.
5. Check for continuity between ABS actuator and el ectric unit (control unit) harness connector and the
ground.
Is the inspection result normal?
YES >> Perform trouble diagnosis for ignition power supply. Refer to PG-89, "Wiring Diagram - IGNITION
POWER SUPPLY -".
NO >> Repair or replace error-detected parts.
3.CHECK ABS ACTUATOR AND ELECTRIC UNIT (C ONTROL UNIT) IGNITION POWER SUPPLY (2)
1. Turn the ignition switch OFF.
2. Check voltage between ABS actuator and electr ic unit (control unit) harness connector and ground.
3. Turn the ignition switch ON. CAUTION:
Never start engine.
4. Check voltage between ABS actuator and electr ic unit (control unit) harness connector and ground.
Is the inspection result normal?
YES >> GO TO 5.
NO >> GO TO 4.
4.CHECK ABS ACTUATOR AND ELECTRIC UNIT (CON TROL UNIT) IGNITION POWER SUPPLY CIRCUIT
(2)
1. Turn the ignition switch OFF.
2. Check 10A fuse (#74).
3. Check continuity and short circuit between ABS act uator and electric unit (control unit) harness connector
terminal (49) and 10A fuse (#74).
Is the inspection result normal?
YES >> Perform trouble diagnosis for ignition power supply. Refer to PG-89, "Wiring Diagram - IGNITION
POWER SUPPLY -".
NO >> Repair or replace error-detected parts.
5.CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) GROUND CIRCUIT
1. Turn the ignition switch OFF.
2. Check continuity between ABS actuator and elec tric unit (control unit) harness connector and ground.
ABS actuator and electric unit (control unit) IPDM E/R
Continuity
Connector Terminal Connector Terminal
E36 18 E15 59 Existed
ABS actuator and electric unit (control unit)
— Continuity
Connector Terminal
E36 18 Ground Not existed
ABS actuator and electric unit (control unit) —Voltage
Connector Terminal
E37 49 Ground Approx. 0 V
ABS actuator and electric unit (control unit) —Voltage
Connector Terminal
E37 49 Ground 10 − 16 V
Revision: 2010 May2011 QX56

BRC-74
< DTC/CIRCUIT DIAGNOSIS >[WITH VDC]
C1109 POWER AND
GROUND SYSTEM
Is the inspection result normal?
YES >> GO TO 6.
NO >> Repair or replace error-detected parts.
6.CHECK TERMINAL
 Check ABS actuator and electric unit (control unit) pin terminals for damage or loose connection with har-
ness connector.
 Check IPDM E/R 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.
ABS actuator and electric unit (control unit) — Continuity
Connector Terminal
E36 2
Ground Existed
3
E37 48
Revision: 2010 May2011 QX56

C1111 PUMP MOTORBRC-75
< DTC/CIRCUIT DIAGNOSIS > [WITH VDC]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
C1111 PUMP MOTOR
DTC LogicINFOID:0000000006222599
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.CHECK DTC DETECTION
With CONSULT-III.
1. Turn the ignition switch OFF and depress the brake pedal 20 times or more.
2. Start the engine and wait for 3 minutes or more. CAUTION:
Never drive the vehicle.
3. Depress the brake pedal, and then operate the ABS act uator and electric unit (control unit) motor repeats
ON and OFF 4 times or more.
CAUTION:
Never drive the vehicle.
4. Perform self-diagnosis for “ABS”.
Is DTC
“C 1111” detected?
YES >> Proceed to diagnosis procedure. Refer to BRC-75, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006222600
1.CHECK ABS MOTOR AND MOTOR RELAY 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 ABS MOTOR AND MOTOR RELAY POWER SUPPLY CIRCUIT
DTC Display Item Malfunction detected condition Possible causes
C 1111 P U M P M O T O R  When a malfunction is detected in motor or motor
relay.
 When a low pressure malfunction is detected in ac- cumulator.
 When a malfunction is detected in accumulator
pressure sensor.  Harness or connector
 ABS actuator and electric unit
(control unit)
Fusible link
 Battery power supply system
 Motor/accumulator assembly
ABS actuator and electric unit (control unit)
—Voltage
Connector Terminal
E36 4 Ground Battery voltage
E37 47
ABS actuator and electric unit (control unit)
—Voltage
Connector Terminal
E36 4 Ground Battery voltage
E37 47
Revision: 2010 May2011 QX56

BRC-76
< DTC/CIRCUIT DIAGNOSIS >[WITH VDC]
C1111 PUMP MOTOR
1. Turn the ignition switch OFF.
2. Check 50A fusible link (M).
3. Check continuity and short circui
t between ABS actuator and electric unit (control unit) harness connector
terminal (4 or 47) and 50A fusible link (M).
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 ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) GROUND CIRCUIT
1. Turn the ignition switch OFF.
2. Check continuity between ABS actuator and electr ic unit (control unit) harness connector and the ground.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair or replace error-detected parts.
4.CHECK MOTOR/ACCUMULATOR ASSEMBLY
Check motor/accumulator assembly. Refer to BR-15, "
Inspection".
Is the inspection result normal?
YES >> GO TO 5.
NO >> Replace motor/accumulator assembly. Refer to BR-29, "
Removal and Installation" and BR-30,
"Disassembly and Assembly".
5.CHECK TERMINAL
Check ABS actuator and electric unit (control unit) 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.
ABS actuator and electric unit (control unit)
—Continuity
Connector Terminal
E36 2
Ground Existed
3
E37 48
Revision: 2010 May2011 QX56

C1115 WHEEL SENSORBRC-77
< DTC/CIRCUIT DIAGNOSIS > [WITH VDC]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
C1115 WHEEL SENSOR
DTC LogicINFOID:0000000006222601
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.CHECK DTC DETECTION
With CONSULT-III.
1. Start engine and drive vehicle at approx. 30 km/h (19 MPH) or more for approx. 1 minute.
2. Perform self-diagnosis for “ABS”.
Is DTC
“C 111 5” detected?
YES >> Proceed to diagnosis procedure. Refer to BRC-77, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006222602
CAUTION:
For wheel sensor, never check between terminals.
1.CHECK TIRE
1. Turn the ignition switch OFF.
2. Check tire air pressure, wear and size. Refer to WT-69, "
Tire Air Pressure".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Adjust air pressure. Or replace tire. Refer to WT-69, "
Tire Air Pressure".
2.CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) POWER SUPPLY SYSTEM
Check ABS actuator and electric unit (cont rol unit) power supply system. Refer to BRC-113, "
Diagnosis Proce-
dure".
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace error-detected parts.
3.CHECK WHEEL SENSOR HARNESS
1. Disconnect ABS actuator and electric unit (control unit) harness connector.
2. Disconnect wheel sensor harness connector.
3. Check continuity between ABS actuator and electr ic unit (control unit) harness connector and wheel sen-
sor harness connector. (Check continuity when steering wheel is steered to RH and LH, or center harness
in wheel housing is moved.)
Measurement connector and termi nal for power supply circuit
DTC Display Item Malfunction detected condition Possible causes
C 111 5 ABS SENSOR
[ABNORMAL SIGNAL] When difference in wheel speed between any wheel
and others is detected during the vehicle is driven,
because of installation of other tires than specified.  Harness or connector
 Wheel sensor
 Sensor rotor
 ABS actuator and electric unit
(control unit)
ABS actuator and electric unit (control unit) Wheel sensor Continuity
Connector Terminal Connector Terminal
E36 20 E22 (Front LH wheel)
1 Existed
33 E39 (Front RH wheel)
22 C10 (Rear LH wheel)
35 C11 (Rear RH wheel)
Revision: 2010 May2011 QX56