Infiniti QX56 (JA60). Manual - part 144

ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)

BRC-89

< ECU DIAGNOSIS >

[VDC/TCS/ABS]

C

D

E

G

H

I

J

K

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M

A

B

BRC

N

O

P

 SLCT LVR POSI

A/T selector lever position

P position
R position
N position
D position

P
R
N
D

ENGINE SPEED

With engine running

With engine stopped

0 rpm

Engine running

Almost in accor-
dance with tachome-
ter display

YAW RATE SEN

Yaw rate detected by yaw rate/side/decel G 
sensor

When vehicle is stopped

Approx. 0 d/s

When vehicle turning

−75 to 75 d/s

R POSI SIG

Transmission range switch signal ON/OFF 
condition

A/T shift position = R position

ON

A/T shift position = other than R position

OFF

4WD FAIL REQ
(Note 3)

Transfer control unit fail-safe signal

When transfer control unit is in fail-safe 
mode

ON

When transfer control unit is normal

OFF

N POSI SIG

Transmission range switch signal ON/OFF 
condition

A/T shift position = N position

ON

A/T shift position = other than N position

OFF

P POSI SIG

Transmission range switch signal ON/OFF 
condition

A/T shift position = P position

ON

A/T shift position = other than P position

OFF

CV1

VDC switch-over valve

When actuator (switch-over valve) is ac-
tive (“ACTIVE TEST” with CONSULT-III) 
or actuator relay is inactive (when in fail-
safe mode)

ON

When actuator (switch-over valve) is not 
active and actuator relay is active (igni-
tion switch ON)

OFF

CV2

VDC switch-over valve

When actuator (switch-over valve) is ac-
tive (“ACTIVE TEST” with CONSULT-III) 
or actuator relay is inactive (when in fail-
safe mode)

ON

When actuator (switch-over valve) is not 
active and actuator relay is active (igni-
tion switch ON)

OFF

SV1

VDC switch-over valve

When actuator (switch-over valve) is ac-
tive (“ACTIVE TEST” with CONSULT-III) 
or actuator relay is inactive (when in fail-
safe mode)

ON

When actuator (switch-over valve) is not 
active and actuator relay is active (igni-
tion switch ON)

OFF

SV2

VDC switch-over valve

When actuator (switch-over valve) is ac-
tive (“ACTIVE TEST” with CONSULT-III) 
or actuator relay is inactive (when in fail-
safe mode)

ON

When actuator (switch-over valve) is not 
active and actuator relay is active (igni-
tion switch ON)

OFF

2WD/4WD

Drive axle

2WD model

2WD

4WD model

4WD

 Monitor item

Display content

Data monitor

Condition

Reference value in 

normal operation

BRC-90

< ECU DIAGNOSIS >

[VDC/TCS/ABS]

ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)

ACCEL POS SIG 

Throttle actuator opening/closing is dis-
played (linked with accelerator pedal)

Accelerator pedal not depressed (ignition 
switch is ON)

0 %

Accelerator pedal depressed (ignition 
switch is ON)

0 - 100 %

SIDE G-SENSOR

Transverse G detected by side G sensor

Vehicle stopped

Approx. 0 m/s

2

Vehicle turning right

Negative value 

(m/s

2

)

Vehicle turning left

Positive value

(m/s

2

)

STR ANGLE SIG

Steering angle detected by steering angle 
sensor

Straight-ahead

Approx. 0

°

Steering wheel turned

–720 to 720

°

BST OPER SIG

Active booster operation

Active booster is active

ON

Active booster is inactive

OFF

PRESS SENSOR

Brake fluid pressure detected by front pres-
sure sensor

With ignition switch turned ON and brake 
pedal released

Approx. 0 bar

With ignition switch turned ON and brake 
pedal depressed

–40 to 300 bar

EBD SIGNAL

EBD operation

EBD is active

ON

EBD is inactive

OFF

ABS SIGNAL

ABS operation

ABS is active

ON

ABS is inactive

OFF

TCS SIGNAL

TCS operation

TCS is active

ON

TCS is inactive

OFF

VDC SIGNAL

VDC operation

VDC is active

ON

VDC is inactive

OFF

EBD FAIL SIG

EBD fail-safe signal

In EBD fail-safe

ON

EBD is normal

OFF

ABS FAIL SIG

ABS fail-safe signal

In ABS fail-safe

ON

ABS is normal

OFF

TCS FAIL SIG

TCS fail-safe signal

In TCS fail-safe

ON

TCS is normal

OFF

VDC FAIL SIG

VDC fail-safe signal

In VDC fail-safe

ON

VDC is normal

OFF

CRANKING SIG

Crank operation

Crank is active

ON

Crank is inactive

OFF

FLUID LEV SW

Brake fluid level switch signal status

When brake fluid level switch ON

ON

When brake fluid level switch OFF 

OFF

PRESS SEN2

Brake fluid pressure detected by rear pres-
sure sensor

With ignition switch turned ON and brake 
pedal released

Approx. 0 bar

With ignition switch turned ON and brake 
pedal depressed

–40 to 300 bar

DELTA S SEN

 Value detected by delta stroke sensor

When brake pedal is depressed

1.05 - 1.80 mm

When brake pedal is released

0.00 mm (+0.6/-0.4)

RELEASE SW NO

 Active booster signal status

When brake pedal is depressed

ON

When brake pedal is released

OFF

 Monitor item

Display content

Data monitor

Condition

Reference value in 

normal operation

ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)

BRC-91

< ECU DIAGNOSIS >

[VDC/TCS/ABS]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

N

O

P

NOTE:
• 1: Confirm tire pressure is normal.
• 2: On and off timing for warning lamp and indicator lamp.
• 3: Only 4WD models.
- ABS warning lamp: Refer to 

BRC-82, "Description"

.

- Brake warning lamp: Refer to 

BRC-83, "Description"

.

- VDC OFF indicator lamp: Refer to 

BRC-84, "Description"

.

- SLIP indicator lamp: Refer to 

BRC-86, "Description"

.

TERMINAL LAYOUT

RELEASE SW NC

 Active booster signal status

When brake pedal is depressed

OFF

When brake pedal is released

ON

OHB FAIL

OHB fail safe signal

OHB is active

ON

OHB is inactive

OFF

HBA FAIL

HBA fail safe signal

HBA is active

ON

HBA is inactive

OFF

OHB SIG

OHB operation

In OHB fail-safe

ON

OHB is normal

OFF

HBA SIG

HBA operation

In HBA fail-safe

ON

HBA is normal

OFF

STP OFF RLY

Stop lamp relay signal

When stop lamp relay is ON

ON

When stop lamp relay is OFF

OFF

 Monitor item

Display content

Data monitor

Condition

Reference value in 

normal operation

AWFIA0032ZZ

BRC-92

< ECU DIAGNOSIS >

[VDC/TCS/ABS]

ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)

Wiring Diagram - BRAKE CONTROL SYSTEM -

INFOID:0000000005148082

ABFWA0081GB