2010 INFINITI QX56 turn signal

C1113, C1145, C1146 YAW RATE/SIDE/DECEL G SENSOR
BRC-39
< COMPONENT DIAGNOSIS > [VDC/TCS/ABS]
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C1113, C1145, C1146 YAW RATE/SIDE/DECEL G SENSOR
DescriptionINFOID:0000000005147985
The yaw rate/side/decel G sensor detects the yaw rate /side/decel G affecting the vehicle, and transmits the
data to the ABS actuator and electric uni t (control unit) as an analog voltage signal.
DTC LogicINFOID:0000000005147986
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.CHECK SELF-DIAGNOSIS RESULTS
Check the self-diagnosis results.
Is above displayed on the self-diagnosis display?
YES >> Proceed to diagnosis procedure. Refer to BRC-39, "Diagnosis Procedure".
NO >> Inspection End
Diagnosis ProcedureINFOID:0000000005147987
Regarding Wiring Diagram information, refer to BRC-92, "Wiring Diagram - BRAKE CONTROL SYSTEM -".
CAUTION:
• Sudden turns (such as spin turns, acceleration turns), drifting, etc. when VDC function is OFF may
cause the yaw rate/side/decel G sensor system to indi cate a malfunction. This is not a malfunction if
normal operation can be resumed after restarting the engine.
• If vehicle is on turn table at entrance to parking garage, or on other moving surface, VDC OFF indica- tor lamp may illuminate and CONSULT-III self-dia gnosis may indicate yaw rate sensor system mal-
function. However, in this case there is no malfunc tion in yaw rate sensor system. Take vehicle off of
turn table or other moving surface, and st art engine. Results will return to normal.
1.CONNECTOR INSPECTION
1. Disconnect the ABS actuator and electric unit (control unit) connector and yaw rate/side/decel G sensor connector.
2. Check the terminals for deformation, disconnection, looseness or damage.
Is the inspection result normal?
YES >> GO TO 2
NO >> Repair or replace as necessary.
2.YAW RATE/SIDE/DECEL G SENSOR HARNESS INSPECTION
DTC Display item Malfunction detected condition Possible cause
C1113 G-SENSOR Longitudinal G-sensor is malfunctioning, or signal line of
longitudinal G-sensor is open or shorted.
• Harness or connector
• ABS actuator and electric unit
(control unit)
• Yaw rate/side/decel G sensor
C1145 YAW RATE SENSOR
Yaw rate sensor is malfunctioning, or the yaw rate sensor
signal line is open or shorted.
C1146 SIDE G-SEN CIRCUIT Side G sensor is malfunctioning, or circuit of side G sen-
sor is open or shorted.
Self-diagnosis results
G-SENSOR
YAW RATE SENSOR
SIDE G-SEN CIRCUIT
Revision: April 20092010 QX56

BRC-40
< COMPONENT DIAGNOSIS >[VDC/TCS/ABS]
C1113, C1145, C1146 YAW
RATE/SIDE/DECEL G SENSOR
Check continuity between the ABS actuator and electric unit (control
unit) connector E125 (A) and the yaw rate/side/decel G sensor con-
nector M108 (B).
Is the inspection result normal?
YES >> GO TO 3
NO >> Repair or replace as necessary.
3.YAW RATE/SIDE/DECEL G SENSOR INSPECTION
1. Connect the yaw rate/side/decel G sensor connector and ABS actuator and electric unit (control unit) con- nector.
2. Perform the yaw rate/side/decel G sensor component inspection. Refer to BRC-40, "
Component Inspec-
tion".
Is the inspection result normal?
YES >> Replace the ABS actuator and electric unit (control unit). Refer to BRC-116, "Removal and Instal-
lation".
NO >> Replace the yaw rate/side/decel G sensor. Refer to BRC-119, "
Removal and Installation".
Component InspectionINFOID:0000000005147988
1.CHECK DATA MONITOR
Select “YAW RATE SEN”, “SIDE G-SENSOR”, “DECEL G-SEN” in “DATA MONITOR” and check yaw rate/
side/decel G sensor signal.
Is the inspection result normal?
YES >> Inspection End
NO >> Go to diagnosis procedure. Refer to BRC-39, "
Diagnosis Procedure".
Special Repair RequirementINFOID:0000000005194907
1.ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION
Always perform neutral position adjustment for the st eering angle sensor when replacing the ABS actuator
and electric unit (control unit). Refer to BRC-8, "
ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL
POSITION : Description".
>> GO TO 2
2.CALIBRATION OF DECEL G SENSOR
Always perform calibration of decel G sensor when replac ing the ABS actuator and electric unit (control unit).
Refer to BRC-9, "
CALIBRATION OF DECEL G SENSOR : Description".
ABS actuator and electric unit
(control unit) Yaw rate/side/decel G sensor
Continuity
Connector Terminal Connector Terminal
E125 (A) 6
M108 (B) 3
Ye s
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5
25 1
29 2
AWFIA0024ZZ
Vehicle conditionYAW RATE SEN
(DATA MONITOR) SIDE G-SENSOR
(DATA MONITOR) DECEL G-SEN
(DATA MONITOR)
Stopped -4 to +4 deg/s -1.1 to +1.1 m/s-0.11 G to +0.11 G
Turning right Negative value Negative value -
Turning left Positive value Positive value -
Speed up --Negative value
Speed down --Positive value
Revision: April 20092010 QX56

BRC-42
< COMPONENT DIAGNOSIS >[VDC/TCS/ABS]
C1115 WHEEL SENSOR
C1115 WHEEL SENSOR
DescriptionINFOID:0000000005147990
When the sensor rotor rotates, the magnetic field changes. It converts the magnetic field changes to current
signals (rectangular wave) and transmits them to t
he ABS actuator and electric unit (control unit).
DTC LogicINFOID:0000000005147991
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.CHECK SELF-DIAGNOSIS RESULTS
Check the self-diagnosis results.
Is above displayed on the self-diagnosis display?
YES >> Proceed to diagnosis procedure. Refer to BRC-42, "Diagnosis Procedure".
NO >> Inspection End
Diagnosis ProcedureINFOID:0000000005194908
Regarding Wiring Diagram information, refer to BRC-92, "Wiring Diagram - BRAKE CONTROL SYSTEM -".
CAUTION:
Do not check between wheel sensor terminals.
1.CONNECTOR INSPECTION
1. Disconnect the ABS actuator and electric unit (contro l unit) connector and wheel sensor of malfunctioning
code.
2. Check the terminals for deformati on, disconnection, looseness or damage.
Is the inspection result normal?
YES >> GO TO 2
NO >> Repair or replace as necessary.
2.CHECK WHEEL SENSOR OUTPUT SIGNAL
1. Connect ABS active wheel sensor tester (J-45741) to wheel sensor using appropriate adapter.
2. Turn on the ABS active wheel sensor tester power switch. NOTE:
The green POWER indicator should illuminate. If the POWER indicator does not illuminate, replace the
battery in the ABS active wheel sensor tester before proceeding.
3. Spin the wheel of the vehicle by hand and observe the red SENSOR indicator on the ABS active wheel
sensor tester. The red SENSOR indicator should flash on and off to indicate an output signal.
NOTE:
If the red SENSOR indicator illuminates but does not flash, reverse the polarity of the tester leads and
retest.
Does the ABS active wheel sensor tester detect a signal?
YES >> GO TO 3
NO >> Replace the wheel sensor. Refer to BRC-114, "
Removal and Installation".
DTC Display item Malfunction detected condition Possible cause
C 111 5 ABS SENSOR
[ABNORMAL SIGNAL] When wheel sensor input signal is malfunctioning. • Harness or connector
• Wheel sensor
• ABS actuator and electric unit
(control unit)
Self-diagnosis results
ABS SENSOR [ABNORMAL SIGNAL]
Revision: April 20092010 QX56

C1140 ACTUATOR RLYBRC-55
< COMPONENT DIAGNOSIS > [VDC/TCS/ABS]
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C1140 ACTUATOR RLY
DescriptionINFOID:0000000005148013
Activates or deactivates each solenoid valve according to the signals transmitted by the ABS actuator and
electric unit (control unit).
DTC LogicINFOID:0000000005148014
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.CHECK SELF-DIAGNOSIS RESULTS
Check the self-diagnosis results.
Is above displayed on the self-diagnosis display?
YES >> Proceed to diagnosis procedure. Refer to BRC-55, "Diagnosis Procedure".
NO >> Inspection End
Diagnosis ProcedureINFOID:0000000005194932
Regarding Wiring Diagram information, refer to BRC-92, "Wiring Diagram - BRAKE CONTROL SYSTEM -".
1.CONNECTOR INSPECTION
1. Turn ignition switch OFF.
2. Disconnect ABS actuator and electric unit (control unit) connector.
3. Check terminal for deformation, disconnection, looseness, and so on. If any malfunction is found, repair or replace terminal.
4. Reconnect connectors and then perform the self-diagnosis. Refer to BRC-23, "
CONSULT-III Function
(ABS)".
Is any item indicated on the self-diagnosis display?
YES >> GO TO 2
NO >> Poor connection of connector terminal. Repair or replace connector.
2.CHECK SOLENOID, VDC SWITCH-OVER VALVE A ND ACTUATOR RELAY POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ABS actuator and electric unit (control unit) connec- tor.
3. Check voltage between ABS actuator and electric unit (control unit) connector E125 terminal 32 and ground.
Is the inspection result normal?
YES >> GO TO 3
DTC Display item Malfunction detected condition Possible cause
C1140 ACTUATOR RLY ABS actuator relay or circuit malfunction. • Harness or connector
• ABS actuator and electric unit
(control unit)
Self-diagnosis results
ACTUATOR RLY
ABS actuator and electric unit (control unit) —Volt a ge
Connector Terminal
E125 32Ground Battery voltage
AWFIA0018ZZ
Revision: April 20092010 QX56

C1142 PRESS SENSORBRC-57
< COMPONENT DIAGNOSIS > [VDC/TCS/ABS]
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C1142 PRESS SENSOR
DescriptionINFOID:0000000005148018
The front and rear pressure sensors c onvert the brake fluid pressure to an electric signal and transmit it to the
ABS actuator and electric unit (control unit).
DTC LogicINFOID:0000000005148019
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.CHECK SELF-DIAGNOSIS RESULTS
Check the self-diagnosis results.
Is above displayed on the self-diagnosis display?
YES >> Proceed to diagnosis procedure. Refer to BRC-57, "Diagnosis Procedure".
NO >> Inspection End
Diagnosis ProcedureINFOID:0000000005148020
Regarding Wiring Diagram information, refer to BRC-92, "Wiring Diagram - BRAKE CONTROL SYSTEM -".
FRONT PRESSURE SENSOR
1.CONNECTOR INSPECTION
1. Turn the ignition switch OFF.
2. Disconnect the front pressure sensor connector and AB S actuator and electric unit (control unit) connec-
tor and inspect the terminals for deformation, disconnection, looseness, or damage.
Is the inspection result normal?
YES >> GO TO 2
NO >> Repair connector.
2.FRONT PRESSURE SENSOR CIRCUIT INSPECTION
1. Measure the continuity betw een the ABS actuator and electric
unit (control unit) connector E125 (A) and front pressure sensor
connector E31 (B).
DTC Display item Malfunction detected condition Possible cause
C1142 PRESS SEN CIRCUIT Pressure sensor signal line is open or shorted, or pres-
sure sensor is malfunctioning. • Harness or connector
• Pressure sensor
• ABS actuator and electric unit
(control unit)
Self-diagnosis results
PRESS SEN CIRCUIT
ABS actuator and electric unit (control unit) Front pressure sensor
Continuity
Connector Terminal Connector Terminal
A: E125 18
B: E31 3
Ye s
19 1
20 2
AWFIA0021ZZ
Revision: April 20092010 QX56

BRC-60
< COMPONENT DIAGNOSIS >[VDC/TCS/ABS]
C1143, C1144 STEERING ANGLE SENSOR
C1143, C1144 STEERING ANGLE SENSOR
DescriptionINFOID:0000000005148023
The steering angle sensor detects the rotation amount,
angular velocity and direction of the steering wheel,
and transmits the data to the ABS actuator and el ectric unit (control unit) via CAN communication.
DTC LogicINFOID:0000000005148024
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.CHECK SELF-DIAGNOSIS RESULTS
Check the self-diagnosis results.
Is above displayed on the self-diagnosis display?
YES >> Proceed to diagnosis procedure. Refer to BRC-60, "Diagnosis Procedure".
NO >> Inspection End
Diagnosis ProcedureINFOID:0000000005148025
Regarding Wiring Diagram information, refer to BRC-92, "Wiring Diagram - BRAKE CONTROL SYSTEM -".
1.CONNECTOR INSPECTION
1. Turn ignition switch OFF.
2. Disconnect ABS actuator and electric unit (control unit) connector.
3. Disconnect steering angle sensor connector.
4. Check terminal for deformation, disconnection, looseness, and so on. If any malfunction is found, repair or replace terminal.
5. Reconnect connectors and then perform the self-diagnosis. Refer to BRC-23, "
CONSULT-III Function
(ABS)".
Is any item indicated on the self-diagnosis display?
YES >> GO TO 2
NO >> Poor connection of connector term inal. Repair or replace connector.
2.CHECK STEERING ANGLE SENSOR HARNESS
1. Turn ignition switch OFF.
2. Disconnect steering angle sensor connector.
DTC Display item Malfunction detected condition Possible cause
C1143 ST ANG SEN CIRCUIT Neutral position of steering angle sensor is dislocated, or
the steering angle sensor is malfunctioning. • Harness or connector
• Steering angle sensor
• ABS actuator and electric unit
(control unit)
C1144 ST ANG SEN SIGNAL Neutral position of steering angle sensor is not finished.
Self-diagnosis results
ST ANG SEN CIRCUIT ST ANG SEN SIGNAL
Revision: April 20092010 QX56

C1143, C1144 STEERING ANGLE SENSORBRC-61
< COMPONENT DIAGNOSIS > [VDC/TCS/ABS]
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3. Check continuity between steering angle sensor connector M17 terminal 2 and ground.
4. Turn ignition switch ON.
5. Check voltage between steering angle sensor connector M17 terminal 3 and ground.
Is the inspection result normal?
YES >> GO TO 3
NO >> Repair or replace malfunctioning components.
3.CHECK DATA MONITOR
1. Connect the steering angle sensor connector and ABS ac tuator and electric unit (control unit) connector.
2. Perform the steering angle sensor component inspection. Refer to BRC-61, "
Component Inspection".
Is the inspection result normal?
YES >> Replace ABS actuator and electric unit (control unit). Refer to BRC-116, "Removal and Installa-
tion".
NO >> Replace steering angle sensor and adjust neutra l position of steering angle sensor. Refer to BRC-
118, "Removal and Installation".
Component InspectionINFOID:0000000005148026
1.CHECK DATA MONITOR
Select “STR ANGLE SIG” in “DATA MONITOR” and check steering angle sensor signal.
Is the inspection result normal?
YES >> Inspection End
NO >> Go to diagnosis procedure. Refer to BRC-60, "
Diagnosis Procedure".
Special Repair RequirementINFOID:0000000005194918
1.ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION
Always perform neutral position adjustment for the st eering angle sensor when replacing the ABS actuator
and electric unit (control unit). Refer to BRC-8, "
ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL
POSITION : Description".
>> GO TO 2
Steering angle sensor —Continuity
Connector Terminal
M17 2Ground Yes
WFIA0399E
Steering angle sensor
—Voltage
Connector Terminal
M17 3Ground Battery voltage
AWFIA0023ZZ
Steering condition STR ANGLE SIG (DATA MONITOR)
Driving straight ±2.5 °
Turn 90 ° to right Approx. +90 °
Turn 90 ° to left Approx. −90 °
Revision: April 20092010 QX56

BRC-66
< COMPONENT DIAGNOSIS >[VDC/TCS/ABS]
C1156 ST ANG SEN COM CIR
C1156 ST ANG SEN COM CIR
DescriptionINFOID:0000000005148033
The steering angle sensor is connected to the ABS actuat
or and electric unit (control unit) in addition to CAN
lines. CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle
multiplex communication line with high data communication speed and excellent error detection ability. Many
electronic control units are equipped onto a vehicle, and each control unit shares information and links with
other control units during operation (not independent). In CAN communication, control units are connected
with 2 communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less
wiring. Each control unit transmits/receives data but selectively reads required data only.
DTC LogicINFOID:0000000005148034
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.CHECK SELF-DIAGNOSIS RESULTS
Check the self-diagnosis results.
Is above displayed on the self-diagnosis display?
YES >> Proceed to diagnosis procedure. Refer to BRC-66, "Diagnosis Procedure".
NO >> Inspection End
Diagnosis ProcedureINFOID:0000000005148035
1.CHECK CONNECTOR
1. Turn ignition switch OFF and disconnect ABS actuator and electric unit (control unit) connector, check ter-
minal for deformation, disconnection, looseness, and so on. If any malfunction is found, repair or replace
terminal.
2. Reconnect connector and perform self-diagnosis. Refer to BRC-23, "
CONSULT-III Function (ABS)".
Is above displayed on the self-diagnosis display?
YES >> Refer to LAN-14, "Trouble Diagnosis Flow Chart".
NO >> Inspection End
DTC Display item Malfunction detected condition Possible cause
C1156 ST ANG SEN COM CIR When steering angle sensor is not transmitting CAN
communication signal to th
e ABS actuator and electric
unit (control unit). • Harness or connector
• CAN communication line
• Steering angle sensor
• ABS actuator and electric unit
(control unit)
Self-diagnosis results
ST ANG SEN COM CIR
Self-diagnosis results
CAN COMM CIRCUIT
ST ANG SEN COM CIR
Revision: April 20092010 QX56