2011 INFINITI QX56 Factory Service Manual

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Page 537 of 5598

INFINITI QX56 2011 Factory Service Manual
BRC-20
< SYSTEM DESCRIPTION >[WITH VDC]
SYSTEM
Front RH caliper ABS IN valve is close, fluid pressure of front RH caliper is holds.
Front LH caliper ABS IN valve is close, fluid pressure of front L

Page 538 of 5598

INFINITI QX56 2011 Factory Service Manual
SYSTEMBRC-21
< SYSTEM DESCRIPTION > [WITH VDC]
C
D
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G H
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K L
M A
B
BRC
N
O P
Being returned to reservoir tank through ABS OUT valve, fluid pressure of rear LH caliper is decreased.
VDC is Oper

Page 539 of 5598

INFINITI QX56 2011 Factory Service Manual
BRC-22
< SYSTEM DESCRIPTION >[WITH VDC]
SYSTEM
Pressurized brake fluid from accumulator is supplied to rear RH caliper through suction valve 2 and ABS IN
valve. When not increases, ABS IN valve is

Page 540 of 5598

INFINITI QX56 2011 Factory Service Manual
SYSTEMBRC-23
< SYSTEM DESCRIPTION > [WITH VDC]
C
D
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G H
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K L
M A
B
BRC
N
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Rear LH caliper ABS IN valve is close, fluid pressure of rear LH caliper is holds.
VDC is Operation (When Pressure De

Page 541 of 5598

INFINITI QX56 2011 Factory Service Manual
BRC-24
< SYSTEM DESCRIPTION >[WITH VDC]
SYSTEM
Rear LH caliper Being returned to reservoir tank through ABS OUT valve, fluid pressure of rear LH caliper is decreased.
Component Parts and Function
*:

BRC-24
< SYSTEM DESCRIPTION >[WITH VDC]
SYSTEM
Rear LH caliper Being returned to reservoir tank through ABS OUT valve, fluid pressure of rear LH caliper is decreased.
Component Parts and Function
*: Models with Advanced Driver Assistance System
CONDITION FOR TURN ON THE WARNING LAMP
ABS Warning Lamp
Turns ON at the same time as VDC warning lamp
when either ABS function or EBD function is malfunction-
ing.
Turns ON when ignition switch turns ON and turns OFF when the system is normal, for bulb check purposes.
Brake Warning Lamp
Turns ON at the same time as ABS warning lamp and VDC warning lamp when EBD function, motor/accu- mulator assembly or motor system is malfunctioning.
Turns ON when ignition switch turns ON and turns OFF when the system is normal, for bulb check purposes.
Component Function
Pump Operates the pump drive according
to signals from ABS actuator and electric unit (control unit) by
the motor.
Motor Operates the motor driv e according to signals from ABS actuator and electric unit (control unit).
Accumulator The accumulator accumulates brake fluid conveyed by the motor and pump.
ABS IN valve Increases, holds or decreases the fluid pressure of each caliper according to signals from ABS ac-
tuator and electric unit (control unit).
ABS OUT valve Increases, holds or decreases the fluid pressure of each caliper according to signals from ABS ac-
tuator and electric unit (control unit).
Cut valve 1
Cut valve 2 Shuts off the ordinary brake line fr
om master cylinder to signals from ABS actuator and electric unit
(control unit).
Suction valve 1 Suction Valve 1 switches the brake line to convey accumulator pressure to the front system, accord-
ing to a signal transmitted from the ABS ac
tuator and electric unit (control unit).
Suction valve 2 Suction valve 2 releases
accumulator pressure, acco rding to a signal transmitted from the ABS ac-
tuator and electric unit (control unit).
Control pressure sensor
*Detects the brake fluid pressure of rear brake caliper and transmits a signal to ABS actuator and
electric unit (control unit).
Accumulator pressure sensor The accumulator pressure sensor detects brake fluid pressure accumulated in the accumulator and
conveys the detected result to the ABS actuator and electric unit (control unit).
Master cylinder pressure sensor Detects the brake fluid pressure of master cylinder part and transmits a signal to ABS actuator and
electric unit (control unit).
Condition (status) ABS warning lamp
Ignition switch OFF OFF
For approx. 1 seconds after the ignition switch is turned ON ON
Approx. 1 seconds after ignition switch is turned ON (when the
system is in normal operation) OFF
ABS function is ma lfunctioning ON
EBD function is malfunctioning ON
Condition (status) Brake warning lamp
Ignition switch OFF OFF
For approx. 1 seconds after the ignition switch is turned ON ON
Approx. 1 seconds after ignition switch is turned ON (when the
system is in normal operation) OFF
After engine starts OFF
When parking brake operates (parking brake switch ON) ON
Revision: 2010 May2011 QX56

Page 542 of 5598

INFINITI QX56 2011 Factory Service Manual
SYSTEMBRC-25
< SYSTEM DESCRIPTION > [WITH VDC]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
VDC Warning Lamp
Turns ON when either VDC function,
TCS function, ABS function or EBD function, hill start assist f

SYSTEMBRC-25
< SYSTEM DESCRIPTION > [WITH VDC]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
VDC Warning Lamp
Turns ON when either VDC function,
TCS function, ABS function or EBD function, hill start assist function or
brake limited slip differential (BLSD) function is malfunctioning.
Turns ON when ignition switch turns ON and turns OFF when the system is normal, for bulb check purposes.
CONDITION FOR TURN ON THE INDICATOR LAMP
VDC OFF Indicator Lamp
Turns ON when VDC function and TCS function are s witched to non-operational status (OFF) by VDC OFF
switch.
Turns ON when ignition switch turns ON and turns OFF when the system is normal, for bulb check purposes.
*: Models with 4WD system
Fail-safeINFOID:0000000006228184
VDC FUNCTION, TCS FUNCTION, hill start assi st FUNCTION AND BRAKE LIMITED SLIP DIFFER-
ENTIAL (BLSD) FUNCTION
VDC warning lamp in combination meter turn ON w hen a malfunction occurs in system [ABS actuator and
electric unit (control unit)]. The control is suspended for VDC function, TCS function, hill start assist function
and brake limited slip differential (BLSD) function. T he Vehicle status becomes the same as models without
VDC function, TCS function, hill star t assist function and brake limited slip differential (BLSD) function. How-
ever, ABS function and EBD f unction are operated normally.
When brake fluid is less than the specified level (brake fluid level
switch ON) ON
ABS function is malfunctioning OFF
EBD function is malfunctioning ON
Accumulator is low pressure ON
Motor system is malfunctioning ON
Ignition power supply system is malfunctioning ON Condition (status) Brake warning lamp
Condition (status) VDC warning lamp
Ignition switch OFF OFF
For approx. 1 seconds after the ignition switch is turned ON ON
Approx. 1 seconds after ignition switch is turned ON (when the
system is in normal operation) OFF
VDC function is malfunctioning ON
TCS function is malfunctioning ON
ABS function is malfunctioning ON
EBD function is malfunctioning ON
hill start assist function is malfunctioning ON
Brake limited slip differential (BLSD) function is malfunctioning ON
VDC function is operating Blinking
TCS function is operating Blinking
Condition (status) VDC OFF indicator lamp
Ignition switch OFF OFF
For approx. 1 seconds after the ignition switch is turned ON ON
Approx. 1 seconds after ignition switch is turned ON (when the
system is in normal operation) OFF
When VDC OFF switch is ON (VDC function and TCS function are
OFF) ON
4WD mode: 4L
*ON
Revision: 2010 May2011 QX56

Page 543 of 5598

INFINITI QX56 2011 Factory Service Manual
BRC-26
< SYSTEM DESCRIPTION >[WITH VDC]
SYSTEM
ABS FUNCTION
ABS warning lamp and VDC warning lamp in combinati
on meter turn ON when a malfunction occurs in system
[ABS actuator and electric unit (co

BRC-26
< SYSTEM DESCRIPTION >[WITH VDC]
SYSTEM
ABS FUNCTION
ABS warning lamp and VDC warning lamp in combinati
on meter turn ON when a malfunction occurs in system
[ABS actuator and electric unit (control unit)]. The c ontrol is suspended for VDC function, TCS function, ABS
function, hill start assist function and brake limited sl ip differential (BLSD) function. The vehicle status
becomes the same as models without VDC function, TCS f unction, ABS function, hill start assist function and
brake limited slip differential (BLSD) function. However, EBD function is operated normally.
NOTE:
ABS self-diagnosis sound may be heard the same as in the normal condition, because self-diagnosis is per-
formed when ignition switch turns ON and when vehicle initially starts.
EBD FUNCTION
ABS warning lamp, brake warning lamp and VDC warning lamp in combination meter turn ON when a mal-
function occurs in system [ABS actuator and electric unit (control unit)]. The control is suspended for VDC
function, TCS function, ABS function, EBD function, hill start assist function and brake limited slip differential
(BLSD) function. The vehicle status becomes the sa me as models without VDC function, TCS function, ABS
function, EBD function, hill star t assist function and brake limited slip differential (BLSD) function.
DTC Malfunction detected condition Fail-safe condition
C1101 When an open circuit is detected in rear RH wheel sensor circuit.
The following functions are sus-
pended.
VDC function
TCS function
ABS function
EBD function (only when both 2 rear wheels are malfunctioning)
hill start assist function
Brake limited slip differential
(BLSD) function
C1102 When an open circuit is detected in rear LH wheel sensor circuit.
C1103 When an open circuit is detected in front RH wheel sensor circuit.
C1104 When an open circuit is detected in front LH wheel sensor circuit.
C1105
When power supply voltage of rear RH wheel sensor 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.
C1106 When power supply voltage of rear LH wheel sensor 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 nor- mal.
C1107 When power supply voltage of front RH wheel sensor 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 When power supply voltage of front LH wheel sensor 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.
C1109 When ignition voltage is 10 V or less.
When ignition voltage is 16 V or more. The following functions are sus-
pended.
VDC function
TCS function
ABS function
EBD function
hill start assist function
Brake limited slip differential
(BLSD) function
C 1111
When a malfunction is detected in motor or motor relay.
When a low pressure malfunction is detected in accumulator.
When a malfunction is detected in accumulator pressure sensor.
C 111 5 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. The following functions are sus-
pended.
VDC function
TCS function
ABS function
hill start assist function
Brake limited slip differential
(BLSD) function
C 111 6
When stop lamp switch signal is not input when brake pedal depress.
When stop lamp switch signal is not input when stop lamp relay operates.
C 111 8
*1When a malfunction is detected in transfer control unit system.
Revision: 2010 May2011 QX56

Page 544 of 5598

INFINITI QX56 2011 Factory Service Manual
SYSTEMBRC-27
< SYSTEM DESCRIPTION > [WITH VDC]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
C1120 When a malfunction is detec ted in front LH ABS IN valve.
The following functions are sus-
pended.
VDC functio

SYSTEMBRC-27
< SYSTEM DESCRIPTION > [WITH VDC]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
C1120 When a malfunction is detec ted in front LH ABS IN valve.
The following functions are sus-
pended.
VDC function
TCS function
ABS function
EBD function
hill start assist function
Brake limited slip differential (BLSD) function
C1121 When a malfunction is detec
ted in front LH ABS OUT valve.
C1122 When a malfunction is detected in front RH ABS IN valve.
C1123 When a malfunction is det ected in front RH ABS OUT valve.
C1124 When a malfunction is detected in rear LH ABS IN valve.
C1125 When a malfunction is detected in rear LH ABS OUT valve.
C1126 When a malfunction is det ected in rear RH ABS IN valve.
C1127 When a malfunction is detected in rear RH ABS OUT valve.
C1130 When a malfunction is detected in ECM system. The following functions are sus-
pended.
VDC function
TCS function
hill start assist function
Brake limited slip differential
(BLSD) function
C1140 When a malfunction is detected in actuator relay. The following functions are sus-
pended.
VDC function
TCS function
ABS function
EBD function
hill start assist function
Brake limited slip differential
(BLSD) function
C1142
*2When a malfunction is detected in master cylinder pressure sensor or control pres-
sure sensor. The following functions are sus-
pended.
VDC function
TCS function
hill start assist function
Brake limited slip differential
(BLSD) function
C1143 When a malfunction is detected in steering angle sensor.
C1144 When neutral position adjustment of steering angle sensor is not complete.
C1145
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.
The following functions are sus-
pended.
VDC function
TCS function
ABS function
hill start assist function
Brake limited slip differential
(BLSD) function
C1146 When a malfunction is detected in side/decel G signal.
C1155
When brake fluid level low signal is detected.
When an open circuit is detected in brake fluid level switch circuit.
C1160 When calibration of yaw rate/side/decal G sensor is not complete.
C1164 When a malfunction is detected in cut valve 1. The following functions are sus- pended.
VDC function
TCS function
ABS function
EBD function
hill start assist function
Brake limited slip differential (BLSD) function
C1165 When a malfunction is detected in cut valve 2.
C1166 When a malfunction is detected in suction valve 1.
C1167 When a malfunction is detected in suction valve 2.
C1170 When the informatio
n in ABS actuator and electric unit (control unit) is not the same.The following functions are sus-
pended.
VDC function
TCS function
ABS function
hill start assist function
Brake limited slip differential
(BLSD) function
DTC Malfunction detected condition Fail-safe condition
Revision: 2010 May2011 QX56

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