2008 INFINITI QX56 Factory Service Manual

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Page 545 of 4083

INFINITI QX56 2008 Factory Service Manual BRC-78
< COMPONENT DIAGNOSIS >[VDC/TCS/ABS]
C1185 ICC UNIT
C1185 ICC UNIT
DescriptionINFOID:0000000001691164
When the force applied to brake pedal exceeds a certain level, the brake assist is activate

Page 546 of 4083

INFINITI QX56 2008 Factory Service Manual C1185 ICC UNITBRC-79
< COMPONENT DIAGNOSIS > [VDC/TCS/ABS]
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BRC
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1. Measure the continuity between ABS actuator and electric unit
(control unit) connector E125 and ICC uni

Page 547 of 4083

INFINITI QX56 2008 Factory Service Manual BRC-80
< COMPONENT DIAGNOSIS >[VDC/TCS/ABS]
U1000 CAN COMM CIRCUIT
U1000 CAN COMM CIRCUIT
DescriptionINFOID:0000000001686350
CAN (Controller Area Network) is a serial communication line for real time

BRC-80
< COMPONENT DIAGNOSIS >[VDC/TCS/ABS]
U1000 CAN COMM CIRCUIT
U1000 CAN COMM CIRCUIT
DescriptionINFOID:0000000001686350
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication s
peed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CA N communication, control units are connected with 2
communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only.
DTC LogicINFOID:0000000001686351
DTC DETECTION LOGIC
Diagnosis ProcedureINFOID:0000000001686352
INSPECTION PROCEDURE
1.CHECK CONNECTOR
1. Turn ignition switch OFF, disconnect the ABS actuat or and electric unit (control unit) connector, and check
the terminals for deformation, disconnection, looseness, and so on. If there is a malfunction, repair or
replace the terminal.
2. Reconnect connector and perform self-diagnosis.
Is
“CAN COMM CIRCUIT” displayed in self-diagnosis display items?
YES >> Print out the self-diagnostic results, and refer to LAN-14, "Trouble Diagnosis Flow Chart".
NO >> Connector terminal is loose, damaged, open, or shorted.
Special Repair RequirementINFOID:0000000001691168
1.ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION
Always perform neutral position adjustment for the st eering angle sensor when replacing the ABS actuator
and electric unit (control unit). Refer to BRC-8, "
ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL
POSITION : Description".
>> GO TO 2
2.CALIBRATION OF DECEL G SENSOR
Always perform calibration of decel G sensor when replac ing the ABS actuator and electric unit (control unit).
Refer to BRC-9, "
CALIBRATION OF DECEL G SENSOR : Description".
>> END
DTC Display item Malfunction detected condition Possible cause
U1000 CAN COMM CIRCUIT When ABS actuator and electric unit (control unit) is not
transmitting or receiving CAN communication signal for 2
seconds or more. • CAN communication line
• ABS actuator and electric unit
(control unit)
Revision: March 2010 2008 QX56

Page 548 of 4083

INFINITI QX56 2008 Factory Service Manual VDC OFF SWITCHBRC-81
< COMPONENT DIAGNOSIS > [VDC/TCS/ABS]
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VDC OFF SWITCH
DescriptionINFOID:0000000001686354
VDC OFF switch can deactivate (t urn OFF) the VDC/TCS fun

Page 549 of 4083

INFINITI QX56 2008 Factory Service Manual BRC-82
< COMPONENT DIAGNOSIS >[VDC/TCS/ABS]
VDC OFF SWITCH
NO >> Repair or replace harness.
3.CHECK VDC OFF SWITCH GROUND
Check continuity between VDC OFF switch connector M253 and
ground.
Is the insp

Page 550 of 4083

INFINITI QX56 2008 Factory Service Manual ABS WARNING LAMPBRC-83
< COMPONENT DIAGNOSIS > [VDC/TCS/ABS]
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ABS WARNING LAMP
DescriptionINFOID:0000000001686358
× : ON –: OFF
Component Function CheckINFOID:00000

Page 551 of 4083

INFINITI QX56 2008 Factory Service Manual BRC-84
< COMPONENT DIAGNOSIS >[VDC/TCS/ABS]
BRAKE WARNING LAMP
BRAKE WARNING LAMP
DescriptionINFOID:0000000001686361
×
: ON –: OFF
NOTE:
• 1: Brake warning lamp will turn on in case of parking br

Page 552 of 4083

INFINITI QX56 2008 Factory Service Manual VDC OFF INDICATOR LAMPBRC-85
< COMPONENT DIAGNOSIS > [VDC/TCS/ABS]
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VDC OFF INDICATOR LAMP
DescriptionINFOID:0000000001686364
× : ON –: OFF
Component Function Check

VDC OFF INDICATOR LAMPBRC-85
< COMPONENT DIAGNOSIS > [VDC/TCS/ABS]
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VDC OFF INDICATOR LAMP
DescriptionINFOID:0000000001686364
× : ON –: OFF
Component Function CheckINFOID:0000000001686365
1.VDC OFF INDICATOR LAMP OPERATION CHECK 1
Check that the lamp illuminates for approximately 1 second after the ignition switch is turned ON.
Is the inspection result normal?
YES >> GO TO 2
NO >> Go to diagnosis procedure. Refer to BRC-85, "
Diagnosis Procedure".
2.VDC OFF INDICATOR LAMP OPERATION CHECK 2
Check that the VDC OFF indicator lamp in the combination meter turns ON/OFF correctly when operating the
VDC OFF switch.
Is the inspection result normal?
YES >> Inspection End
NO >> Check VDC OFF switch. Refer to BRC-81, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000001686366
1.CHECK VDC OFF SWITCH
Check that the VDC OFF indicator lamp in the combination meter turns ON/OFF correctly when operating the
VDC OFF switch.
Is the inspection result normal?
YES >> GO TO 2
NO >> Check VDC OFF switch. Refer to BRC-81, "
Diagnosis Procedure".
2.CHECK SELF-DIAGNOSIS
Perform ABS actuator and electric unit (control unit) self-diagnosis. Refer to BRC-24, "
CONSULT-III Function
(ABS)".
Is the inspection result normal?
YES >> GO TO 3
NO >> Check items displayed by self-diagnosis.
3.CHECK COMBINATION METER
Check if the indication and operation of combination meter are normal. Refer to MWI-24, "
Diagnosis Descrip-
tion".
Is the inspection result normal?
YES >> Replace ABS actuator and electric unit (control unit). Refer to BRC-116, "Removal and Installa-
tion".
NO >> Replace combination meter. Refer to MWI-76, "
Removal and Installation".
Condition VDC OFF indicator lamp
Ignition switch OFF –
For 1 second after turning ON ignition switch ×
1 second later after turning ON ignition switch –
VDC OFF switch turned ON. (VDC function is OFF.) ×
VDC/TCS function is malfunctioning. ×
ABS function is malfunctioning. ×
EBD function is malfunctioning. ×
Revision: March 2010 2008 QX56

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