Infiniti M35/M45 Y50. Manual - part 325

BRC-1

BRAKE CONTROL SYSTEM

F  BRAKES

CONTENTS

C

D

E

G

H

I

J

K

L

M

SECTION 

BRC

A

B

BRC

BRAKE CONTROL SYSTEM

VDC/TCS/ABS

PRECAUTIONS .......................................................... 3

Precautions for Supplemental Restraint System 
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” .................................................................. 3
Precautions for Procedures without Cowl Top Cover 

..... 3

Precautions for Brake System .................................. 3
Precautions for Brake Control  .................................. 4

PREPARATION ........................................................... 5

Special Service Tools  ............................................... 5
Commercial Service Tools ........................................ 5

ON-VEHICLE SERVICE  ............................................. 6

Adjustment of Steering Angle Sensor Neutral Posi-
tion ........................................................................... 6

SYSTEM DESCRIPTION  ............................................ 7

System Diagram ....................................................... 7
Functions .................................................................. 7

ABS ....................................................................... 7
EBD ....................................................................... 7
TCS ....................................................................... 8
VDC ....................................................................... 8
ECD ....................................................................... 8

Operation That Is Not "System Error"  ...................... 8

ABS ....................................................................... 8
TCS ....................................................................... 8
VDC ....................................................................... 8

Hydraulic Circuit Diagram  ........................................ 9
CAN Communication ................................................ 9

SYSTEM DESCRIPTION  ...................................... 9

TROUBLE DIAGNOSIS ............................................ 10

Fail-Safe Function  .................................................. 10

ABS, EBD SYSTEM ............................................ 10
VDC/TCS ............................................................ 10

How to Perform Trouble Diagnoses  ....................... 10

BASIC CONCEPT  ............................................... 10
DIAGNOSIS FLOW CHART  ................................11
ASKING COMPLAINTS  ...................................... 12
EXAMPLE OF DIAGNOSIS WORKSHEET  ........ 12

Component Parts Location ..................................... 13
Schematic .............................................................. 14

Wiring Diagram — VDC —  ..................................... 15
Control Unit Input/Output Signal Standard  ............. 21

REFERENCE VALUE FROM CONSULT-II  ......... 21

CONSULT-II Functions (ABS)  ................................ 23

CONSULT-II MAIN FUNCTION  ........................... 23
CONSULT-II SETTING PROCEDURE  ................ 23

Self-Diagnosis ........................................................ 24

OPERATION PROCEDURE ................................ 24
ERASE MEMORY  ............................................... 24
DISPLAY ITEM LIST  ........................................... 25

Data Monitor  ........................................................... 28

OPERATION PROCEDURE ................................ 28
DISPLAY ITEM LIST  ........................................... 28

Active Test  .............................................................. 30

OPERATION PROCEDURE ................................ 30
TEST ITEMS  ....................................................... 31

For Fast and Accurate Diagnosis  ........................... 32

PRECAUTIONS FOR DIAGNOSIS  ..................... 32

Basic Inspection  ..................................................... 33

BASIC INSPECTION 1: BRAKE FLUID LEVEL, 
LEAK INSPECTION AND BRAKE PAD  .............. 33
BASIC INSPECTION 2: LOOSENESS OF 
POWER SYSTEM TERMINALS AND BATTERY ... 33
BASIC INSPECTION 3: ABS WARNING LAMP, 
BRAKE WARNING LAMP, VDC OFF INDICATOR 
LAMP AND SLIP INDICATOR LAMP  .................. 33

TROUBLE DIAGNOSIS FOR SYSTEM .................... 34

Wheel Sensor Circuit .............................................. 34

INSPECTION PROCEDURE  .............................. 34

Engine System  ....................................................... 36

INSPECTION PROCEDURE  .............................. 36

ABS Actuator and Electric Unit (Control Unit)  ........ 36

INSPECTION PROCEDURE  .............................. 36

ABS Actuator and Electric Unit (Control Unit) Power 
Supply and Ground Circuit  ..................................... 37

INSPECTION PROCEDURE  .............................. 37

ABS Motor and Motor Relay Circuit ........................ 38

INSPECTION PROCEDURE  .............................. 38

Solenoid, VDC Change-Over Valve and Actuator 
Relay Circuit  ........................................................... 39

BRC-2

INSPECTION PROCEDURE ............................... 39

Pressure Sensor Circuit .......................................... 40

INSPECTION PROCEDURE ............................... 40

Steering Angle Sensor Circuit ................................. 41

INSPECTION PROCEDURE ............................... 41

Stop Lamp Switch Circuit ........................................ 43

INSPECTION PROCEDURE ............................... 43

Yaw Rate/Side G Sensor Circuit ............................. 44

INSPECTION PROCEDURE ............................... 44

Brake Fluid Level Switch Circuit  ............................. 46

INSPECTION PROCEDURE ............................... 46

RAS Control Unit Circuit (With RAS)  ...................... 47

INSPECTION PROCEDURE ............................... 47

ICC Sensor Integrated Unit Circuit (With ICC) ........ 48

INSPECTION PROCEDURE ............................... 48

CAN Communication Circuit  ................................... 48

INSPECTION PROCEDURE ............................... 48

VDC OFF Switch Circuit  ......................................... 49

INSPECTION PROCEDURE ............................... 49

Parking Brake Switch Circuit  .................................. 50

INSPECTION PROCEDURE ............................... 50

Warning Lamp and Indicator Lamp Circuit  ............. 50

INSPECTION PROCEDURE ............................... 50

TROUBLE DIAGNOSIS FOR SYMPTOMS  .............. 51

Excessive ABS Function Operation Frequency ...... 51
Unexpected Pedal Reaction  ................................... 51

The Braking Distance Is Long .................................52
ABS Function Does Not Operate  ............................52
Pedal Vibration or ABS Operation Sound Occurs ...52
Vehicle Jerks During VDC/TCS/ABS Control ..........53

WHEEL SENSOR  ......................................................54

Removal and Installation .........................................54

COMPONENT ......................................................54
REMOVAL ............................................................54
INSTALLATION ....................................................54

SENSOR ROTOR  ......................................................56

Removal and Installation .........................................56

REMOVAL ............................................................56
INSTALLATION ....................................................56

ACTUATOR AND ELECTRIC UNIT (ASSEMBLY) ...57

Removal and Installation .........................................57

COMPONENT ......................................................57
REMOVAL ............................................................57
INSTALLATION ....................................................58

G-SENSOR ................................................................59

Removal and Installation .........................................59

REMOVAL ............................................................59
INSTALLATION ....................................................59

STEERING ANGLE SENSOR  ...................................60

Removal and Installation .........................................60

REMOVAL ............................................................60
INSTALLATION ....................................................60

PRECAUTIONS

BRC-3

[VDC/TCS/ABS]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

[VDC/TCS/ABS]

PRECAUTIONS

PFP:00001

Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT 
BELT PRE-TENSIONER”

NFS000PY

The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SRS and SB section of this Service Man-
ual.

WARNING:

●

To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
in the event of a collision which would result in air bag inflation, all maintenance must be per-
formed by an authorized NISSAN/INFINITI dealer.

●

Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the SRS section.

●

Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or
harness connectors.

Precautions for Procedures without Cowl Top Cover

NFS000PZ

When performing the procedure after removing cowl top cover, cover
the lower end of windshield with urethane, etc.

Precautions for Brake System

NFS000Q0

●

Recommended fluid is brake fluid “DOT 3”. Refer to 

MA-12, "RECOMMENDED FLUIDS AND LUBRI-

CANTS"

 .

●

Do not reuse drained brake fluid.

●

Be careful not to splash brake fluid on painted surface of body. If brake fluid is splashed on painted sur-
faces of body immediately wipe off then with cloth and then wash it away with water.

●

Do not use mineral oils such as gasoline or kerosene. They will ruin rubber parts of the hydraulic system.

●

Use a flare nut wrench when removing flare nuts, and use a flare
nut crowfoot and torque wrench when tighten brake tube flare
nuts.

●

When installing brake tubes, be sure to check torque.

●

Brake system is an important safety part. If a brake fluid leak is
detected, always disassemble the affected part. If a malfunction
is detected, replace part with a new one.

●

Before working, turn ignition switch OFF and disconnect con-
nectors of ABS actuator and electric unit (control unit) or battery
negative terminal.

WARNING:

Clean brake pads and shoes with a waste cloth, then wipe with a dust collector.

PIIB3706J

SBR686C

BRC-4

[VDC/TCS/ABS]

PRECAUTIONS

Precautions for Brake Control

NFS000Q1

●

Just after starting vehicle after ignition switch ON, brake pedal may vibrate or motor operating noise may
be heard from engine compartment. This is normal condition.

●

When an error is indicated by ABS or another warning lamp, collect all necessary information from cus-
tomer (what symptoms are present under what conditions) and check for simple causes before starting
diagnostic servicing. Besides electrical system inspection, check brake booster operation, brake fluid
level, and oil leaks.

●

If tire size and type are used in an improper combination, or brake pads are not Genuine NISSAN parts,
stopping distance or steering stability may deteriorate.

●

ABS might be out of order or malfunctions by putting a radio (wiring inclusive), an antenna and a lead-in
wire near the control unit.

●

If aftermarket parts (car stereo, CD player, etc.) have been installed, check for incidents such as harness
pinches, open circuits, and improper wiring.

●

VDC system may not operate normally or a VDC OFF indicator lamp or SLIP indicator lamp may light. 

–

When replacing the following parts with parts other than genuine parts or making modifications: Suspen-
sion-related parts (shock absorber, spring, bushing, etc.), tires, wheels (other than specified sizes), brake-
related parts (pad, rotor, caliper, etc.), engine-related parts (muffler, ECM, etc.) and body reinforcement-
related parts (roll bar, tower bar, etc.).

–

When driving with worn or deteriorated suspension, tires and brake-related parts.