Infiniti G37 Coupe. Manual — part 16
ADP-58
< COMPONENT DIAGNOSIS >
B2126 DETENT SW
3.
Check continuity between driver seat control unit harness connector and A/T device harness connector.
4.
Check continuity between driver seat control unit harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair or replace harness.
4.
CHECK INTERMITTENT INCIDENT
GI-38, "Intermittent Incident"
Is the inspection result normal?
YES
>> Replace driver seat control unit.
NO
>> Repair or replace the malfunctioning part.
Driver seat control unit connec-
tor
Terminal
A/T device connector
Terminal
Continuity
B503
21
M137
11
Existed
Driver seat control unit connec-
tor
Terminal
Ground
Continuity
B503
21
Not existed
B2127 PARKING BRAKE SWITCH
ADP-59
< COMPONENT DIAGNOSIS >
C
D
E
F
G
H
I
K
L
M
A
B
ADP
N
O
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B2127 PARKING BRAKE SWITCH
Description
INFOID:0000000001693668
• Parking brake switch is installed on parking brake lever. It is turned ON when the parking brake is applied.
• The driver seat control unit judges that the parking brake is engaged if continuity exists in this circuit.
DTC Logic
INFOID:0000000001693669
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
STEP 1
Drive the vehicle at 7 km/h (4 MPH) or more.
>> GO TO 2.
2.
STEP 2
Check “Self Diagnostic Result” with CONSULT-III.
Is the DTC detected?
YES
>> Perform diagnosis procedure. Refer to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000001693670
1.
CHECK PARKING BRAKE SWITCH SIGNAL
1.
Turn ignition switch ON.
2.
Select “PARK BRAKE SW” in “Data Monitor” mode with CONSULT-III.
3.
Check parking brake switch signal under the following condition.
Is the status normal?
YES
>> GO TO 4.
NO
>> GO TO 2.
2.
CHECK PARKING BRAKE SWITCH HARNESS CONTINUITY
1.
Turn ignition switch OFF.
2.
Disconnect driver seat control unit connector and parking brake switch connector.
3.
Check continuity between driver seat control unit harness connector and parking brake switch harness
connector.
DTC No.
Trouble diagnosis
name
DTC detecting condition
Possible cause
B2127
PARKING BRAKE
Parking brake is engaged and the vehicle speed of
7 km/h (4MPH) or more is detected.
• Harness and connectors
(Parking brake switch circuit is
opened/shorted.)
• Parking brake switch
• Combination meter
(CAN communication)
• Driver seat control unit
Monitor item
Condition
Status
PARK BRAKE SW
Parking brake
Applied
ON
Release
OFF
Driver seat control unit connec-
tor
Terminal
Parking brake switch
Terminal
Continuity
B503
8
B14
1
Existed
ADP-60
< COMPONENT DIAGNOSIS >
B2127 PARKING BRAKE SWITCH
4.
Check continuity between driver seat control unit harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace harness.
3.
CHECK PARKING BRAKE SWITCH
ADP-60, "Component Inspection"
.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Adjust or replace parking brake switch.
4.
CHECK INTERMITTENT INCIDENT
GI-38, "Intermittent Incident"
Is the inspection result normal?
YES
>> Replace driver seat control unit.
NO
>> Repair or replace the malfunctioning part.
Component Inspection
INFOID:0000000001693671
1.
CHECK PARKING BRAKE SWITCH
1.
Turn ignition switch OFF.
2.
Disconnect parking brake switch connector.
3.
Check continuity between parking brake switch terminal and ground part of parking brake switch.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Adjust or replace parking brake switch.
Driver seat control unit connec-
tor
Terminal
Ground
Continuity
B503
8
Not existed
Terminal
Condition
Continuity
Parking brake switch
1
Ground part of
parking brake switch
Parking brake
Applied
Existed
Other than above
Not existed
B2128 UART COMMUNICATION LINE
ADP-61
< COMPONENT DIAGNOSIS >
C
D
E
F
G
H
I
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L
M
A
B
ADP
N
O
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B2128 UART COMMUNICATION LINE
Description
INFOID:0000000001693672
Driver seat control unit performs UART communication with the automatic drive positioner control unit using 2
communication lines, TX and RX line. Driver seat control unit receives the operation signals of tilt & telescopic
switch, door mirror remote control switch, set switch and memory switch and the position signals of tilt & tele-
scopic sensor and door mirror sensor from the automatic drive positioner control unit and transmits the opera-
tion request signal.
DTC Logic
INFOID:0000000001693673
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
STEP 1
Turn ignition switch ON.
>> GO TO 2.
2.
STEP 2
Operate tilt & telescopic switch for more than 2 seconds.
>> GO TO 3.
3.
PROCEDURE 3
Check “Self Diagnostic Result” with CONSULT-III.
Is the DTC detected?
YES
>> Perform diagnosis procedure. Refer to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000001693674
1.
CHECK UART COMMUNICATION LINE CONTINUITY
1.
Turn ignition switch OFF.
2.
Disconnect driver seat control unit connector and automatic drive positioner control unit connector.
3.
Check continuity between driver seat control unit harness connector and automatic drive positioner con-
trol unit harness connector.
4.
Check continuity between driver seat control unit harness connector and ground.
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
B2128
UART COMM
The communication between driver seat control unit
and auto drive positioner control unit is interrupted for
a period of time.
• UART communication line
(UART communication line is
open or shorted)
• Driver seat control unit
• Automatic drive positioner
control unit
Driver seat control unit connec-
tor
Terminal
Automatic drive positioner con-
trol unit connector
Terminal
Continuity
B503
1
M51
10
Existed
17
26
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