Infiniti G37 Coupe. Manual — part 274
BRC-70
< COMPONENT DIAGNOSIS >
[VDC/TCS/ABS]
U1000, U1002 CAN COMM CIRCUIT
U1000, U1002 CAN COMM CIRCUIT
Description
INFOID:0000000001635120
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 speed 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 CAN 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 Logic
INFOID:0000000001635121
DTC DETECTION LOGIC
Diagnosis Procedure
INFOID:0000000001635122
1.
CHECK CONNECTOR
1.
Turn ignition switch OFF.
2.
Disconnect ABS actuator and electric unit (control unit) connector.
3.
Check terminal for deformation, disconnection, looseness, and so on. If any malfunction is found, repair or
replace terminal.
4.
Reconnect connector and perform self-diagnosis.
Is above displayed on the self-diagnosis display?
YES
>> Go to
LAN-25, "CAN System Specification Chart"
.
NO
>> INSPECTION END
Special Repair Requirement
INFOID:0000000001635123
1.
ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION
Always perform the neutral position adjustment for the steering angle sensor, when replacing the ABS actua-
tor and electric unit (control unit). Refer to
BRC-8, "ADJUSTMENT OF STEERING ANGLE SENSOR NEU-
>> 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)
U1002
SYSTEM COMM
When ABS actuator and electric unit (control unit) is not
transmitting or receiving CAN communication signal for 2
seconds or less.
Self-diagnosis results
CAN COMM CIRCUIT
SYSTEM COMM
PARKING BRAKE SWITCH
BRC-71
< COMPONENT DIAGNOSIS >
[VDC/TCS/ABS]
C
D
E
G
H
I
J
K
L
M
A
B
BRC
N
O
P
PARKING BRAKE SWITCH
Description
INFOID:0000000001635124
The parking brake switch converts the status of the parking brake lever (M/T models) or the parking brake
pedal (A/T models) to an electric signal and transmits it to the ABS actuator and electric unit (control unit).
Component Function Check
INFOID:0000000001635125
1.
CHECK PARKING BRAKE SWITCH OPERATION
Operate the parking brake lever (M/T models) or the parking brake pedal (A/T models). Then check that the
brake warning lamp in the combination meter turns on/off correctly.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Go to diagnosis procedure. Refer to
Diagnosis Procedure
INFOID:0000000001635126
1.
CHECK PARKING BRAKE SWITCH
1.
Turn ignition switch OFF.
2.
Disconnect parking brake switch connector.
3.
Check continuity between parking brake switch connector terminal.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Replace parking brake switch.
2.
CHECK COMBINATION METER
Check if the indication and operation of combination meter are normal. Refer to
.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace combination meter.
3.
CHECK DATA MONITOR
On “DATA MONITOR”, select “PARK BRAKE SW” and perform the parking brake switch inspection.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Check unified meter and A/C amp. Refer to
MWI-37, "CONSULT-III Function (METER/M&A)"
Condition
Brake warning lamp illumination status
When the parking brake switch is opera-
tion
ON
When the parking brake switch is not oper-
ation.
OFF
Parking brake switch
—
Condition
Continuity
Connector
Terminal
B14 (M/T models)
E107 (A/T models)
1
Ground
When the parking brake switch is operated.
Existed
When the parking brake switch is not operated.
Not existed
Condition
PARK BRAKE SW (DATA MONITOR)
Parking brake switch is active
On
Parking brake switch is inactive
Off
BRC-72
< COMPONENT DIAGNOSIS >
[VDC/TCS/ABS]
PARKING BRAKE SWITCH
Component Inspection
INFOID:0000000001635127
1.
CHECK PARKING BRAKE SWITCH
1.
Turn ignition switch OFF.
2.
Disconnect parking brake switch connector.
3.
Check continuity between parking brake switch connector terminal.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace parking brake switch.
Parking brake switch
—
Condition
Continuity
Connector
Terminal
B14 (M/T models)
E107 (A/T models)
1
Ground
When the parking brake switch is operated.
Existed
When the parking brake switch is not operated.
Not existed
VDC OFF SWITCH
BRC-73
< COMPONENT DIAGNOSIS >
[VDC/TCS/ABS]
C
D
E
G
H
I
J
K
L
M
A
B
BRC
N
O
P
VDC OFF SWITCH
Description
INFOID:0000000001635128
VDC OFF switch can deactivate (turn OFF) the VDC/TCS function by pressing the VDC OFF switch.
Component Function Check
INFOID:0000000001635129
1.
CHECK VDC OFF SWITCH OPERATION
Turn ON/OFF the VDC OFF switch and check that the VDC OFF indicator lamp in the combination meter turns
ON/OFF correctly.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Go to diagnosis procedure. Refer to
Diagnosis Procedure
INFOID:0000000001635130
1.
CHECK VDC OFF SWITCH
1.
Turn ignition switch OFF.
2.
Disconnect VDC OFF switch connector.
3.
Check continuity between VDC OFF switch connector terminals.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> VDC OFF switch is malfunctioning. Replace VDC OFF switch.
2.
CHECK VDC OFF SWITCH HARNESS
1.
Disconnect ABS actuator and electric unit (control unit) connector.
2.
Check continuity between VDC OFF switch connector terminals and ABS actuator and electric unit (con-
trol unit) connector terminal and/or ground.
Is the inspection result normal?
Condition
VDC OFF indicator lamp illumination status
VDC OFF switch: ON
ON
VDC OFF switch: OFF
OFF
VDC OFF switch
Condition
Continuity
Connector
Terminal
M19
1
−
2
When VDC OFF switch is hold pressed.
Existed
When releasing VDC OFF switch.
Not existed
ABS actuator and electric unit
(control unit)
VDC OFF switch
Continuity
Connector
Terminal
Connector
Terminal
E41
31
M19
1
Existed
ABS actuator and electric unit (control unit)
—
Continuity
Connector
Terminal
E41
31
Ground
Not existed
VDC OFF switch
—
Continuity
Connector
Terminal
M19
2
Ground
Existed
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