2011 INFINITI QX56 Factory Service Manual

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Page 633 of 5598

INFINITI QX56 2011 Factory Service Manual
BRC-116
< DTC/CIRCUIT DIAGNOSIS >[WITH VDC]
POWER SUPPLY AND GROUND CIRCUIT
NO >> Repair or replace error-detected parts.
Revision: 2010 May2011 QX56

Page 634 of 5598

INFINITI QX56 2011 Factory Service Manual
PARKING BRAKE SWITCHBRC-117
< DTC/CIRCUIT DIAGNOSIS > [WITH VDC]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
PARKING BRAKE SWITCH
Component Function CheckINFOID:0000000006222643
1.CHECK PARKING BRA KE SWITCH O

Page 635 of 5598

INFINITI QX56 2011 Factory Service Manual
BRC-118
< DTC/CIRCUIT DIAGNOSIS >[WITH VDC]
PARKING BRAKE SWITCH
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair or replace combination meter. Refer to
MWI-85, "
Removal and Installati

Page 636 of 5598

INFINITI QX56 2011 Factory Service Manual
VDC OFF SWITCHBRC-119
< DTC/CIRCUIT DIAGNOSIS > [WITH VDC]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
VDC OFF SWITCH
Component Function CheckINFOID:0000000006222646
1.CHECK VDC OFF SWITCH OPERATION
Check that

VDC OFF SWITCHBRC-119
< DTC/CIRCUIT DIAGNOSIS > [WITH VDC]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
VDC OFF SWITCH
Component Function CheckINFOID:0000000006222646
1.CHECK VDC OFF SWITCH OPERATION
Check that VDC OFF indicator lamp in combinati on meter turns ON/OFF when VDC OFF switch is operated.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Proceed to diagnosis procedure. Refer to BRC-119, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000006222647
NOTE:
VDC OFF switch is integrated in SNOW MODE / TOW MODE / VDC OFF switch assembly (2WD models) or
4WD switch assembly (4WD models).
1.CHECK VDC OFF SWITCH CIRCUIT
1. Turn the ignition switch OFF.
2. Disconnect ABS actuator and electric unit (control unit) harness connector.
3. Disconnect SNOW MODE / TOW MODE / VDC OFF s witch assembly (2WD models) or 4WD switch
assembly (4WD models) harness connector.
4. Check continuity between ABS actuator and elec tric unit (control unit) harness connector and SNOW
MODE / TOW MODE / VDC O FF switch assembly (2WD models) or 4WD switch assembly (4WD models)
harness connector.
*1: SNOW MODE / TOW MODE / VDC OFF switch assembly (2WD models)
*2: 4WD switch assembly (4WD models)
5. Check continuity between ABS actuator and electr ic unit (control unit) harness connector terminal and
ground.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace error-detected parts.
2.CHECK VDC OFF SW ITCH GROUND CIRCUIT
Check continuity between SNOW MODE / TOW MODE / VDC OFF switch assembly (2WD models) or 4WD
switch assembly (4WD models) harness connector terminal and ground.
*1: SNOW MODE / TOW MODE / VDC OFF switch assembly (2WD models)
*2: 4WD switch assembly (4WD models)
ABS actuator and electric unit (control unit)SNOW MODE / TOW MODE / VDC OFF
switch assembly (2WD models) or 4WD switch assembly (4WD models) Continuity
Connector Terminal Connector Terminal
E36 39 M147
*1
M54*21 Existed
ABS actuator and electric unit (control unit) —Continuity
Connector Terminal
E36 39 Ground Not existed
SNOW MODE / TOW MODE / VDC
OFF switch assembly (2WD models) or 4WD switch assembly (4WD models) —Continuity
Connector Terminal M147
*1
M54*220 Ground Existed
Revision: 2010 May2011 QX56

Page 637 of 5598

INFINITI QX56 2011 Factory Service Manual
BRC-120
< DTC/CIRCUIT DIAGNOSIS >[WITH VDC]
VDC OFF SWITCH
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace error-detected parts.
3.CHECK VDC OFF SWITCH
Check VDC OFF switch.

BRC-120
< DTC/CIRCUIT DIAGNOSIS >[WITH VDC]
VDC OFF SWITCH
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace error-detected parts.
3.CHECK VDC OFF SWITCH
Check VDC OFF switch. Refer to BRC-120, "
Component Inspection".
Is the inspection result normal?
YES >> GO TO 4.
NO >> Replace VDC OFF switch. Refer to BRC-140, "
Removal and Installation".
4.CHECK VDC OFF SWITCH SIGNAL
With CONSULT-III.
1. Connect ABS actuator and electric unit (control unit) harness connector.
2. Connect SNOW MODE / TOW MODE / VDC OFF switch assembly (2WD models) or 4WD switch assem-
bly (4WD models) harness connector.
3. Select “ABS”, “DATA MONITOR” and “OFF SW” accord ing to this order. Check VDC OFF switch signal.
Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 5.
5.CHECK TERMINAL
Check ABS actuator and electric unit (control unit) pin terminals for damage or loose connection with har-
ness connector.
Check SNOW MODE / TOW MODE / VDC OFF switch assembly (2WD models) or 4WD switch assembly (4WD models) pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?
YES >> Replace ABS actuator and electr ic unit (control unit). Refer to BRC-137, "Removal and Installa-
tion".
NO >> Repair or replace error-detected parts.
Component InspectionINFOID:0000000006222648
NOTE:
VDC OFF switch is integrated in SNOW MODE / TOW MODE / VDC OFF switch assembly (2WD models) or
4WD switch assembly (4WD models).
1.CHECK VDC OFF SWITCH
1. Turn the ignition switch OFF.
2. Disconnect SNOW MODE / TOW MODE / VDC OFF s witch assembly (2WD models) or 4WD switch
assembly (4WD models) harness connector.
3. Check continuity between terminals of SNOW MO DE / TOW MODE / VDC OFF switch assembly (2WD
models) or 4WD switch assembly (4WD models) connector.
Is the inspection result normal?
YES >> INSPECTION END
Condition DATA MONITOR
When VDC OFF switch is pressed and VDC OFF indicator
lamp in combination meter is in ON status On
When VDC OFF switch is pressed and VDC OFF indicator
lamp in combination meter is in OFF status Off
SNOW MODE / TOW MODE / VDC OFF
switch assembly (2WD models) or 4WD switch assembly (4WD models) Condition Continuity
Terminal
1 – 20 When VDC OFF switch is pressed Existed
When VDC OFF switch is not pressed Not existed
Revision: 2010 May2011 QX56

Page 638 of 5598

INFINITI QX56 2011 Factory Service Manual
VDC OFF SWITCHBRC-121
< DTC/CIRCUIT DIAGNOSIS > [WITH VDC]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
NO >> Replace VDC OFF switch. Refer to BRC-140, "Removal and Installation".
Revision: 2010 May2011 QX56

Page 639 of 5598

INFINITI QX56 2011 Factory Service Manual
BRC-122
< DTC/CIRCUIT DIAGNOSIS >[WITH VDC]
ABS WARNING LAMP
ABS WARNING LAMP
Component Function CheckINFOID:0000000006222649
1.CHECK ABS WARNING LAMP FUNCTION
Check that ABS warning lamp in combinat

Page 640 of 5598

INFINITI QX56 2011 Factory Service Manual
BRAKE WARNING LAMPBRC-123
< DTC/CIRCUIT DIAGNOSIS > [WITH VDC]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
BRAKE WARNING LAMP
Component Function CheckINFOID:0000000006222651
1.CHECK BRAKE WARNING LAMP FUNCTION

BRAKE WARNING LAMPBRC-123
< DTC/CIRCUIT DIAGNOSIS > [WITH VDC]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
BRAKE WARNING LAMP
Component Function CheckINFOID:0000000006222651
1.CHECK BRAKE WARNING LAMP FUNCTION (1)
Check that brake 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 >> GO TO 2.
NO >> Proceed to diagnosis procedure. Refer to BRC-123, "
Diagnosis Procedure".
2.CHECK BRAKE WARNING LAMP FUNCTION (2)
Check that brake warning lamp in combination meter turns ON/OFF when parking brake is operated.
NOTE:
Brake warning lamp turns ON when parking brake is operated (when parking brake switch is ON).
Is the inspection result normal?
YES >> GO TO 3.
NO >> Check parking brake switch system. Refer to BRC-117, "
Diagnosis Procedure".
3.CHECK BRAKE WARNING LAMP FUNCTION (3)
Check that brake warning lamp in combination meter turns ON/OFF when brake fluid level switch is operated
while brake fluid level in reservoir tank is with the specified level.
NOTE:
Brake warning lamp turns ON when brake fluid is less than the specified level (when brake fluid level switch is
ON).
Is the inspection result normal?
YES >> INSPECTION END
NO >> Check brake fluid level switch system. Refer to BRC-103, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000006222652
1.CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) POWER SUPPLY AND GROUND CIR-
CUIT
Perform the trouble diagnosis for ABS actuator and elec tric 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 BRAKE WARNING LAMP SIGNAL
With CONSULT-III.
1. Select “ABS”, “DATA MONITOR” and “EBD WARN 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?
Revision: 2010 May2011 QX56

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