Infiniti QX56 (Z62). Manual - part 160

VDC WARNING LAMP

BRC-125

< DTC/CIRCUIT DIAGNOSIS >

[WITH VDC]

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VDC WARNING LAMP

Component Function Check

INFOID:0000000006222653

1.

CHECK VDC WARNING LAMP FUNCTION

Check that VDC warning lamp in combination meter turns ON for approx. 1 second after ignition switch is
turned ON.

CAUTION:

Never start engine.
Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Proceed to diagnosis procedure. Refer to 

BRC-125, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000006222654

1.

CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) POWER SUPPLY AND GROUND CIR-

CUIT

Perform the trouble diagnosis for ABS actuator and electric unit (control unit) power supply and ground circuit.
Refer to 

BRC-113, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace error-detected parts.

2.

PERFORM THE SELF-DIAGNOSIS

With CONSULT-III.

Perform self-diagnosis for “ABS”.
Is any DTC detected?

YES

>> Check the DTC. Refer to 

BRC-51, "DTC Index"

.

NO

>> GO TO 3.

3.

CHECK VDC WARNING LAMP SIGNAL

With CONSULT-III.

1.

Select “ABS”, “DATA MONITOR” and “SLIP/VDC LAMP” according to this order.

2.

Turn the ignition switch OFF.

3.

Check that data monitor displays “On” for approx. 1 second after ignition switch is turned ON and then
changes to “Off”.

CAUTION:

Never start engine.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Replace ABS actuator and electric unit (control unit). Refer to 

BRC-137, "Removal and Installa-

tion"

.

4.

CHECK COMBINATION METER

Check combination meter. Refer to 

MWI-30, "CONSULT-III Function"

.

Is the inspection result normal?

YES

>> Replace ABS actuator and electric unit (control unit). Refer to 

BRC-137, "Removal and Installa-

tion"

.

NO

>> Repair or replace combination meter. Refer to 

MWI-85, "Removal and Installation"

.

BRC-126

< DTC/CIRCUIT DIAGNOSIS >

[WITH VDC]

VDC OFF INDICATOR LAMP

VDC OFF INDICATOR LAMP

Component Function Check

INFOID:0000000006222655

1.

CHECK VDC OFF INDICATOR LAMP FUNCTION (1)

Check that VDC OFF indicator lamp in combination meter turns ON for approx. 1 second after ignition switch
is turned ON.

CAUTION:

Never start engine.
Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Proceed to diagnosis procedure. Refer to 

BRC-126, "Diagnosis Procedure"

2.

CHECK VDC WARNING LAMP FUNCTION (2)

Check that VDC OFF indicator lamp in combination meter turns ON/OFF when VDC OFF switch is operated.
Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Check VDC OFF switch system. Refer to 

BRC-119, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000006222656

1.

CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) POWER SUPPLY AND GROUND CIR-

CUIT

Perform the trouble diagnosis for ABS actuator and electric unit (control unit) power supply and ground circuit.
Refer to 

BRC-113, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace error-detected parts.

2.

CHECK VDC OFF INDICATOR LAMP SIGNAL (1)

With CONSULT-III.

1.

Select “ABS”, “DATA MONITOR” and “OFF LAMP” according to this order.

2.

Turn the ignition switch OFF.

3.

Check that data monitor displays “On” for approx. 1 second after ignition switch is turned ON and then
changes to “Off”.

CAUTION:

Never start engine.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Replace ABS actuator and electric unit (control unit). Refer to 

BRC-137, "Removal and Installa-

tion"

.

3.

CHECK VDC OFF INDICATOR LAMP SIGNAL (2)

With CONSULT-III.

1.

Select “ABS”, “DATA MONITOR” and “OFF LAMP” according to this order.

2.

Check that data monitor displays “On” or “Off” each time when VDC OFF switch is operated.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Check VDC OFF switch system. Refer to 

BRC-119, "Diagnosis Procedure"

.

4.

CHECK COMBINATION METER

Check combination meter. Refer to 

MWI-30, "CONSULT-III Function"

.

Is the inspection result normal?

YES

>> Replace ABS actuator and electric unit (control unit). Refer to 

BRC-137, "Removal and Installa-

tion"

.

NO

>> Repair or replace combination meter. Refer to 

MWI-85, "Removal and Installation"

.

EXCESSIVE OPERATION FREQUENCY

BRC-127

< SYMPTOM DIAGNOSIS >

[WITH VDC]

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SYMPTOM DIAGNOSIS

EXCESSIVE OPERATION FREQUENCY

Description

INFOID:0000000006222657

VDC function, TCS function, ABS function, EBD function, hill start assist function and brake limited slip differ-
ential (BLSD) function operates in excessive operation frequency.

Diagnosis Procedure

INFOID:0000000006222658

1.

CHECK BRAKING FORCE

Check brake force using a brake tester.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Check brake system.

2.

CHECK FRONT AND REAR AXLE

Check that there is no excessive looseness in front and rear axle.
• Front axle: Refer to 

FAX-7, "Inspection"

 (2WD), 

FAX-16, "Inspection"

 (4WD).

• Rear axle: Refer to 

RAX-5, "Inspection"

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace error-detected parts.

3.

CHECK WHEEL SENSOR

Check wheel sensor.
• Check installation and damage of wheel sensor.
• Check connection of wheel sensor harness connector.
• Check terminal of wheel sensor harness connector.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>>

Repair or replace wheel sensor.

• Front wheel sensor: Refer to 

BRC-134, "FRONT WHEEL SENSOR : Removal and Installation"

.

• Rear wheel sensor: Refer to 

BRC-135, "REAR WHEEL SENSOR : Removal and Installation"

.

4.

CHECK WARNING LAMP TURNS OFF

Check that ABS warning lamp, brake warning lamp and VDC warning lamp turn OFF approx. 1 second after
key switch is turned ON and stay in OFF status during driving.

CAUTION:

Brake warning lamp turns ON when parking brake is operated (parking brake switch is ON) or brake
fluid is less than the specified level (brake fluid level switch is ON).

Is the inspection result normal?

YES

>> Normal

NO

>> Perform self-diagnosis for “ABS” with CONSULT-III.

BRC-128

< SYMPTOM DIAGNOSIS >

[WITH VDC]

UNEXPECTED BRAKE PEDAL REACTION

UNEXPECTED BRAKE PEDAL REACTION

Description

INFOID:0000000006222659

A malfunction of brake pedal feel (height or others) is detected when brake pedal is depressed.

Diagnosis Procedure

INFOID:0000000006222660

1.

CHECK FRONT AND REAR AXLE

Check that there is no excessive looseness in front and rear axle.
• Front axle: Refer to 

FAX-7, "Inspection"

 (2WD), 

FAX-16, "Inspection"

 (4WD).

• Rear axle: Refer to 

RAX-5, "Inspection"

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace error-detected parts.

2.

CHECK DISC ROTOR

Check disc rotor runout.
• Front: Refer to 

BR-16, "DISC ROTOR : Inspection and Adjustment"

.

• Rear: Refer to 

BR-18, "DISC ROTOR : Inspection and Adjustment"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>>

Refinish or replace disc rotor.

• Front: Refer to 

BR-16, "DISC ROTOR : Inspection and Adjustment"

.

• Rear: Refer to 

BR-18, "DISC ROTOR : Inspection and Adjustment"

.

3.

CHECK BRAKE FLUID LEACKAGE

Check fluid leakage.
• Front: Refer to 

BR-24, "FRONT : Inspection"

.

• Rear: Refer to 

BR-26, "REAR : Inspection"

.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace error-detected parts.

4.

CHECK BRAKE PEDAL

Check each item of brake pedal. Refer to 

BR-7, "Inspection and Adjustment"

.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Adjust each item of brake pedal. Refer to 

BR-7, "Inspection and Adjustment"

.

5.

CHECK BRAKING FORCE

Check brake force using a brake tester.
Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Check each components of brake system.

6.

CHECK BRAKE PERFORMANCE

Disconnect ABS actuator and electric unit (control unit) connector so that ABS does not operate. Check that
brake force is normal in this condition. Connect harness connectors after checking.
Is the inspection result normal?

YES

>> Normal

NO

>> Check each components of brake system.