Its control NISSAN TEANA 2014 Service Manual

BCS-12
< SYSTEM DESCRIPTION >[BCM]
SYSTEM
SIGNAL BUFFER SYSTEM : System Description
INFOID:0000000009461993
OUTLINE
BCM has the signal transmission function that output s/transmits each input/received signal to each unit.
Signal transmission function list
POWER CONSUMPTION CONTROL SYSTEM
POWER CONSUMPTION CONTROL SYSTEM : System DiagramINFOID:0000000009461994
POWER CONSUMPTION CONTROL SY STEM : System DescriptionINFOID:0000000009461995
OUTLINE
• BCM incorporates a power saving control function t hat reduces the power consumption according to the
vehicle status.
• BCM switches the status (control mode) by itself wit h the power saving control function. It performs the sleep
request to each unit (IPDM E/R and combination mete r) that operates with the ignition switch OFF.
Normal mode (wake-up)
- CAN communication is normally performed with other units
- Each control with BCM is operating properly
CAN communication sleep mode (CAN sleep)
- CAN transmission is stopped
- Control with BCM only is operating
Low power consumption mode (BCM sleep)- Low power consumption control is active
- CAN transmission is stopped
LOW POWER CONSUMPTION CONTROL WITH BCM
BCM reduces the power consumption with the follo wing operation in the low power consumption mode.
• The reading interval of each switch changes from 10 ms interval to 60 ms interval.
Sleep mode activation
Signal name Input Output Description
• Ignition switch ON signal
• Ignition switch signal Engine switch (push switch) IPDM E/R (CAN) Inputs the push-button ignition
switch (push switch) signal and
transmits the ignition switch sta-
tus judged with BCM via CAN
communication.
Door switch signal Any door switch • Combination meter (CAN)
• IPDM E/R (CAN) Inputs the door switch signal
and transmits it via CAN com-
munication.
ALCIA0030GB
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

BCS
SYSTEMBCS-13
< SYSTEM DESCRIPTION > [BCM]
C
D E
F
G H
I
J
K L
B
A
O P
N
• BCM receives the sleep-ready signal (ready) from IPDM E/R and combination meter via CAN communica-
tion.
• BCM transmits the sleep wake up signal (sleep) to each unit when all of the CAN sleep conditions are ful-
filled.
• Each unit stops the transmission of CAN communication with the sleep wakeup signal. BCM is in CAN com- munication sleep mode.
• BCM is in the low power consumption mode and performs the low power consumption control when all of the
BCM sleep conditions are fulfilled with CAN sleep condition.
Sleep condition
Wake-up operation
• BCM changes from the low power consumption m ode to the CAN communication sleep mode when the any
of the BCM wake-up conditions are fulfilled. Only the control with BCM is activated.
• BCM transmits the sleep wake up signal (wake up) to each unit when any of the CAN wake-up conditions are fulfilled. It changes from the low power consum ption mode or the CAN communication sleep mode to the
normal mode.
• Each unit starts the transmission of CAN communicati on with the sleep wake up signal. In addition, the com-
bination meter transmits the wake up signal to BCM via CAN communication to report the CAN communica-
tion start.
CAN sleep condition BCM sleep condition
• Receiving the sleep-ready signal (ready) from all units
• Ignition switch: OFF
• Vehicle security system alarm and panic alarm : No operation
• Warning lamp: Not operation
• Intelligent Key system buzzer: No operation
• Brake switch: OFF
• Turn signal indicator lamp: No operation
• Exterior lamp: OFF
• Door lock status: No change
• CONSULT communication status: No communication
• Meter display signal : Non-transmission
• Door switch status: No change
• Rear window defogger: OFF • Interior room lamp batte
ry saver: Time out
• RAP system: OFF
• Power window switch communication: No transmission
• Push-button ignition switch (push switch) illumination: OFF
• NATS: No operation
• Remote keyless entry receiver communication status: No
communication
• Tire pressure monitoring system: Stop
BCM wake-up condition CAN wake-up condition
• Door unlock sensor: OFF →ON, ON →OFF
• Door lock assembly LH (key cylinder switch): Lock or unlock
• Door lock switch: OFF →ON
• Door unlock switch: OFF →ON
• Trunk opener switch: OFF →ON
• Power window serial link communication: Receiving
• Remote keyless entry receiver: Receiving valid keyfob • Receiving the sleep-ready signal (Not-ready) from any units
• Push-button ignition switch (push switch): OFF →ON
• Hazard switch: OFF →ON
• PASSING switch: OFF →ON, ON →OFF
• TAIL LAMP switch: OFF →ON
• Driver door switch: OFF →ON, ON →OFF
• Passenger door switch: OFF → ON, ON → OFF
• Trunk switch: OFF →ON, ON →OFF
• Driver door request swit ch (if equipped): OFF→ON
• Passenger door request switch (if equipped): OFF →ON
• Stop lamp switch 2 signal: ON
• Remote keyless entry receiver: Receiving valid keyfob
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

PRECAUTIONSBRC-5
< PRECAUTION > [VDC/TCS/ABS]
C
D E
G H
I
J
K L
M A
B
BRC
N
O P
Precaution for Brake ControlINFOID:0000000009463736
• During ABS operation, the brake pedal may vibrate lightly and a mechanical noise may be heard. This is normal.
• Just after starting vehicle, the brake pedal may vibrate or a motor operating noise may be heard from engine
compartment. This is a normal status of operation check.
• Stopping distance may be longer than that of vehicles without ABS when vehicle drives on rough, gravel, or
snow-covered (fresh, deep snow) roads.
• When an error is indicated by ABS or another warning lamp, collect all necessary information from customer
(what symptoms are present under what conditions) and check for simple causes before starting diagnosis.
Besides electrical system inspection, check boos ter operation, brake fluid level, and fluid leaks.
• If incorrect tire sizes or types are installed on the vehicle or brake pads are not Genuine NISSAN parts, stop-
ping distance or steering stability may deteriorate.
• If there is a radio, antenna or related wiring near control module, ABS function may have a malfunction or
error.
• If aftermarket parts (car stereo, CD player, etc.) have been installed, check for incidents such as harness pinches, open circuits or improper wiring.
• If the following components are replaced with non-genuine components or modified, the VDC OFF indicator
lamp and SLIP indicator lamp may turn on or the VDC system may not operate properly. Components
related to suspension (shock absorbers, struts, springs , bushings, etc.), tires, wheels (exclude specified
size), components related to brake system (pads, roto rs, calipers, etc.), components related to engine (muf-
fler, ECM, etc.), components related to body reinforcement (roll bar, tower bar, etc.).
• Driving with broken or excessively worn suspensi on components, tires or brake system components may
cause the VDC OFF indicator lamp and the SLIP indicator lamp to turn on, and the VDC system may not
operate properly.
• When the TCS or VDC is activated by sudden acceleration or sudden turn, some noise may occur. The
noise is a result of the normal operation of the TCS and VDC.
• When driving on roads which have extreme slopes (such as mountainous roads) or high banks (such as sharp curves on a freeway), the VDC may not operate no rmally, or the VDC warning lamp and the SLIP indi-
cator lamp may turn on. This is not a problem if normal operation can be resumed after restarting the engine.
• Sudden turns (such as spin turns, acceleration turns), drifting, etc. with VDC turned off may cause the yaw rate/side/decel G sensor to indicate a problem. This is not a problem if normal operation can be resumed
after restarting the engine.
Precaution for CAN SystemINFOID:0000000009463737
• Do not apply voltage of 7.0V or higher to terminal to be measured.
• Maximum open terminal voltage of tester in use must be less than 7.0V.
• Before checking harnesses, turn ignition switch OFF and disconnect battery negative cable.
• Area to be repaired must be soldered and wrapped with tape. Make sure that fraying of twisted wire is within 110 mm (4.33 in).
PKIA0306E
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

COMPONENT PARTSBRC-9
< SYSTEM DESCRIPTION > [VDC/TCS/ABS]
C
D E
G H
I
J
K L
M A
B
BRC
N
O P
Component DescriptionINFOID:0000000009463742
ABS Actuator and Electric Unit (Control Unit)INFOID:0000000009463743
Electric unit (control unit) is integrated with actuator and comprehensively controls VDC function, TCS func-
tion, ABS function and EBD function.
ELECTRIC UNIT (CONTROL UNIT)
• Brake fluid pressure is controlled according to signals from each sensor.
• If malfunction is detected, t he system enters fail-safe mode.
ACTUATOR
The following components are integrated with ABS actuator.
Pump
Returns the brake fluid reserved in reservoir to master cylinder by reducing pressure.
Motor
Activates the pump according to signals from ABS actuator and electric unit (control unit).
Motor Relay
Operates the motor ON/OFF according to signals fr om ABS actuator and electric unit (control unit).
Actuator Relay (Main Relay)
Operates each valve ON/OFF according to signals fr om ABS actuator and electric unit (control unit).
ABS IN Valve
Switches the fluid pressure line to increase or hold according to signals from control unit.
ABS OUT Valve
Switches the fluid pressure line to increase, hold or decrease according to signals from control unit.
Cut Valve 1, Cut Valve 2
Shuts off the ordinary brake line from master cylinder, when VDC function and TCS function are activated.
7. Rear wheel sensor LH (RH similar) 8. VDC OFF switch 9. Steering angle sensor
(view with steering wheel removed)
10. Parking brake switch 11. Stop lamp switch 12. Combination meter
Component Reference/Function
ABS actuator and electric unit (control unit) BRC-9, "ABS Actuator and Electric Unit (Control Unit)"
Wheel sensorBRC-10, "Wheel Sensor and Sensor Rotor"
Stop lamp switchBRC-10, "Stop Lamp Switch"
Steering angle sensorBRC-10, "Steering Angle Sensor"
Vacuum sensorBRC-10, "Vacuum Sensor"
VDC OFF switchBRC-11, "VDC OFF Switch"
Brake fluid level switchBRC-10, "Brake Fluid Level Switch"
Parking brake switchBRC-11, "Parking Brake Switch"
ABS warning lamp
BRC-12, "VDC/TCS/ABS : System Description"
Brake warning lamp
VDC OFF indicator lamp
SLIP indicator lamp
ECM Transmits the following signals to ABS actuator and electric unit (control unit) via CAN
communication.
• Accelerator pedal position signal
• Engine speed signal
• Target throttle position signal
TCM Transmits the current gear position signal
to ABS actuator and electric unit (control
unit) via CAN communication.
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

BRC-10
< SYSTEM DESCRIPTION >[VDC/TCS/ABS]
COMPONENT PARTS
Suction Valve 1, Suction Valve 2
Supplies the brake fluid from master cylinder to t
he pump, when VDC function and TCS function are activated.
Return Check Valve
Returns the brake fluid from brake caliper and wheel cy linder to master cylinder by bypassing orifice of each
valve when brake is released.
Reservoir
Temporarily reserves the brake fluid drained from brake caliper, so that pressure efficiently decreases when
decreasing pressure of brake caliper and wheel cylinder.
Yaw rate/side/decel G sensor
Calculates the following information that affects the vehicle, and transmits a signal to ABS actuator and elec-
tric unit (control unit) via communication lines.
• Vehicle rotation angular velocity (yaw rate signal)
• Vehicle lateral acceleration (side G signal) and longitudinal acceleration (decel G signal)
Pressure Sensor
Detects the brake fluid pressure and transmits signal to ABS actuator and electric unit (control unit).
Wheel Sensor and Sensor RotorINFOID:0000000009463744
NOTE:
• Wheel sensor of front wheel is installed on steering knuckle.
• Sensor rotor of front wheel is integrated in wheel hub assembly.
• Wheel sensor of rear wheel is installed on back plate of rear brake.
• Sensor rotor of rear wheel is installed on rear brake drum.
• Never measure resistance and voltage value using a tester because sensor is active sensor.
• Downsize and weight reduction is aimed. IC for detection portion and magnet for sensor rotor are adopted.
• Power supply is supplied to detection portion so that magnetic field line is read. Magnetic field that is detected is converted to current
signal.
• When sensor rotor rotates, magnetic field changes. Magnetic field change is converted to current signals (rectangular wave) and is
transmitted to ABS actuator and el ectric unit (control unit). Change
of magnetic field is proportional to wheel speed.
Stop Lamp SwitchINFOID:0000000009463745
Detects the operation status of brake pedal and transmits converted electric signal to ABS actuator and elec-
tric unit (control unit).
Steering Angle SensorINFOID:0000000009463746
Detects the following information and transmits steering angl e signal to ABS actuator and electric unit (control
unit) via CAN communication.
• Steering wheel rotation amount
• Steering wheel rotation angular velocity
• Steering wheel rotation direction
Brake Fluid Level SwitchINFOID:0000000009463747
Detects the brake fluid level in reservoir tank and transmi ts converted electric signal from combination meter to
ABS actuator and electric unit (control unit) via CAN communication.
Vacuum SensorINFOID:0000000009463748
Detects the vacuum in brake booster and transmits conver ted electric signal to ABS actuator and electric unit
(control unit).
JPFIC0131GB
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

COMPONENT PARTSBRC-11
< SYSTEM DESCRIPTION > [VDC/TCS/ABS]
C
D E
G H
I
J
K L
M A
B
BRC
N
O P
Parking Brake SwitchINFOID:0000000009463749
Detects the operation status of parking brake switch and transmits converted electric signal from combination
meter to ABS actuator and electric uni t (control unit) via CAN communication.
VDC OFF SwitchINFOID:0000000009463750
• Non-operational status or standby status of VDC and TCS functions can be selected using VDC OFF switch.
VDC OFF indicator lamp indicates the operation stat us of function. (ON: Non-operational status, OFF:
Standby status)
• VDC OFF indicator lamp turns OFF (standby status) when the engine is started again after it is stopped once while VDC OFF indicator lamp is ON (non-operational status).
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

SYSTEMBRC-13
< SYSTEM DESCRIPTION > [VDC/TCS/ABS]
C
D E
G H
I
J
K L
M A
B
BRC
N
O P
VALVE OPERATION (VDC AND TCS FUNCTIONS)
The control unit built in the ABS actuator and electric unit (control unit) controls fluid pressure of the brake cal-
ipers by operating each valve.
VDC and TCS Functions are Operating (Pressure Increases)
Component Signal description
Steering angle sensor Transmits the steering an
gle sensor signal to ABS actuator an d electric unit (control unit) via
CAN communication.
ECM Transmits the following signals to ABS actuator and electric unit (control unit) via CAN commu-
nication.
• Accelerator pedal position signal
• Engine speed signal
• Target throttle position signal
TCM Transmits the current gear positi
on signal to ABS actuator and electric unit (control unit) via
CAN communication.
Combination meter Transmits the following signals to ABS actuator and electric unit (control unit) via CAN commu-
nication.
• Brake fluid level switch signal
• Parking brake switch signal
Receives the foll owing signals from ABS actuator and elec tric unit (control unit) via CAN com-
munication.
• ABS warning lamp signal
• Brake warning lamp signal
• VDC OFF indicator lamp signal
• SLIP indicator lamp signal
ALFIA0309GB
Name Not activated Pressure increases
Cut valve 1 Power supply is not supplied (open) Power supply is supplied (close)
Cut valve 2 Power supply is not supplied (open) Power supply is supplied (close)
Suction valve 1 Power supply is not supplied (close) Power supply is supplied (open)
Suction valve 2 Power supply is not supplied (close) Power supply is supplied (open)
ABS IN valve Power supp ly is not supplied (open) Power supp ly is not supplied (open)
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

BRC-16
< SYSTEM DESCRIPTION >[VDC/TCS/ABS]
SYSTEM
Front RH brake caliper• Since the suction valve 1 and the ABS OUT valve are closed and the cut valve 1 and the ABS IN valve are
open, the fluid pressure applied on the front RH brake ca liper is reduced by supplying the fluid pressure to
the master cylinder via the ABS IN valve and the cut valv e 1. The pressurization for the right caliper is con-
trolled separately from the left caliper.
Front LH brake caliper
• Since the suction valve 2 and the ABS OUT valve are closed and the cut valve 2 and the ABS IN valve are open, the fluid pressure applied on the front LH brake caliper is reduced by supplying the fluid pressure to
the master cylinder via the ABS IN valve and the cut valv e 2. The pressurization for the left caliper is con-
trolled separately from the right caliper.
Rear RH brake caliper
• Since the suction valve 2 and the ABS OUT valve are closed and the cut valve 2 and the ABS IN valve are open, the fluid pressure applied on the rear RH brake ca liper is reduced by supplying the fluid pressure to
the master cylinder via the ABS IN valve and the cut valv e 2. The pressurization for the right caliper is con-
trolled separately from the left caliper.
Rear LH brake caliper• Since the suction valve 1 and the ABS OUT valve are closed and the cut valve 1 and the ABS IN valve are open, the fluid pressure applied on the rear LH brake cali per is reduced by supplying the fluid pressure to the
master cylinder via the ABS IN valve and the cut valve 1. The pressurization for the left caliper is controlled
separately from the right caliper.
Component Parts and Function
VALVE OPERATION (ABS AND EBD FUNCTIONS)
The control unit built into the ABS act uator and electric unit (control unit) controls fluid pressure of the brake
calipers by operating each valve.
ABS IN valve Power supply is not supplied (open) Power supply is not supplied (open)
ABS OUT valve Power supply is not supplied (close) Power supply is not supplied (close)
Each brake caliper (fluid pressure) — Pressure decreases Name Not activated During pressure decreases
Component Function
Pump Returns the brake fluid reserved in reservoir to master cylinder by reducing pressure.
Motor Activates the pu mp according to signals from ABS actuator and el ectric unit (control unit).
Cut valve 1
Cut valve 2 Shuts off the ordinary brake line from master cylinder.
Suction valve 1
Suction valve 2 Supplies the brake fluid from master cylinder to the pump.
ABS IN valve Switches the fluid pressure line to increase or hold according to signals from control unit.
ABS OUT valve Switches the fluid pressure li ne to increase, hold or decrease according to si gnals from control unit.
Return check valve Returns the brake fluid from brake caliper to master cylinder by bypassing orifice of each valve when
brake is released.
Reservoir Temporarily reserves the brake fluid drained from brake caliper, so that pressure efficiently decreas-
es when decreasing pressure of brake caliper.
Pressure sensor Detects the brak e fluid pressure and transmits signal to ABS actuator and electric unit (control unit).
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

BRC-22
< SYSTEM DESCRIPTION >[VDC/TCS/ABS]
SYSTEM
CONDITIONS FOR INDICATOR LAMP ILLUMINATION
• Turns ON when VDC and TCS functions are switched to
non-operational status (OFF) by VDC OFF switch.
• Turns ON when ignition switch turns ON and turns OF F when the system is normal, for bulb check purposes.
CONDITIONS FOR WARNING LAMP ILLUMINATION
Turns ON when ignition switch turns ON and turns OFF when the system is normal, for bulb check purposes.
Component Function
Pump Returns the brake fluid reserved in reservoir to master cylinder by reducing pressure.
Motor Activates the pu mp according to signals from ABS actuator and el ectric unit (control unit).
Cut valve 1
Cut valve 2 Shuts off the ordinary brake line from master cylinder.
Suction valve 1
Suction valve 2 Supplies the brake fluid from master cylinder to the pump.
ABS IN valve Switches the fluid pressure line to increase or hold according to signals from control unit.
ABS OUT valve Switches the fluid pressure li ne to increase, hold or decrease according to si gnals from control unit.
Return check valve Returns the brake fluid from brake caliper to master cylinder by bypassing orifice of each valve when
brake is released.
Reservoir Temporarily reserves the brake fluid drained from brake caliper, so that pressure efficiently decreas-
es when decreasing pressure of brake caliper.
Pressure sensor Detects the brak e fluid pressure and transmits signal to ABS actuator and electric unit (control unit).
Condition (status) VDC OFF indicator lamp SLIP indicator lamp
Ignition switch OFF OFF OFF
For approx. 1 second after the ignition switch
is turned ON ON ON
Approx. 1 second after ignition switch is
turned ON (when the system is in normal op-
eration) OFF OFF
When VDC OFF switch is ON (VDC function
and TCS function are OFF) ON OFF
VDC function is malfunctioning OFF ON
TCS function is malfunctioning OFF ON
Condition (status) ABS warning lamp Brake warning lamp
Ignition switch OFF OFF OFF
For approx. 1 second after the ignition switch
is turned ON ON ON
Approx. 1 second after ignition switch is
turned ON (when the system is in normal op-
eration) OFF OFF
After engine starts OFF OFF
When parking brake operates (parking brake
switch ON) OFF ON
When brake fluid is less than the specified
level (brake fluid level switch ON) OFF ON
When vacuum sensor is malfunctioning OFF ON
VDC function is malfunctioning OFF OFF
TCS function is malfunctioning OFF OFF
ABS function is malfunctioning ON OFF
EBD function is malfunctioning ON ON
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

BRC-24
< SYSTEM DESCRIPTION >[VDC/TCS/ABS]
SYSTEM
• Brake force control function
at braking hard detects driver′s brake operations with the pressure sensor,
judges a brake booster ′s maximum brake power function by using information from the vacuum sensor, and
enhances more powerful braking force by controlling brakes of four wheels.
• VDC warning lamp blinks while VDC function is in operati on and indicates to the driver that the function is in
operation.
• CONSULT can be used to diagnose the system.
• Fail-safe function is adopted. When a malfunction occurs in VDC function, the control is suspended for VDC
function and TCS function. However, ABS functi on and EBD function operate normally. Refer to BRC-41,
"Fail-safe".
INPUT SIGNAL AND OUTPUT SIGNAL
Major signal transmission between each unit via communication lines is shown in the following table.
OPERATION CHARACTERISTICS
VDC Function That Prevents Oversteer Tendency
• During cornering, brake force (brake fluid pressu re) is applied on front wheel and rear wheel on the outer
side of turn. Momentum is generated directing the vehicle toward the outer side of the turn. Oversteer is pre-
vented.
• Changing driving lane on a slippery road, when there may be a tendency to oversteer, engine output is con- trolled as well as brake force (brake fluid pr essure) of 4 wheels. Oversteer tendency decreases.
Component Signal description
ECM Transmits the following signals to ABS actuator and electric unit (control unit) via CAN commu-
nication.
• Acceleration pedal position signal
• Engine speed signal
• Target throttle position signal
TCM Transmits the current gear positi
on signal to ABS actuator and el ectric unit (control unit) via
CAN communication.
Steering angle sensor Transmits the steering angle sensor signal to ABS actuator and electric unit (control unit) via
CAN communication.
Combination meter Transmits the following signals to ABS actuator and electric unit (control unit) via CAN commu-
nication.
• Brake fluid level switch signal
• parking brake switch signal
Receives the following signals from ABS actuator and electric unit (control unit) via CAN com-
munication.
• VDC OFF indicator lamp signal
• SLIP indicator lamp signal
ALFIA0339GB
ALFIA0340GB
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM