Infiniti FX35, FX50 (S51). Manual — part 16
ADP-56
< DTC/CIRCUIT DIAGNOSIS >
B2126 DETENT SW
B2126 DETENT SW
Description
INFOID:0000000005249669
• Detention switch is installed on A/T shift selector. It is turned OFF when the A/T selector lever is in P posi-
tion.
• The driver seat control unit judges that the A/T selector lever is in P position if continuity does not exist in this
circuit.
DTC Logic
INFOID:0000000005249670
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
RERFORM DTC CONFIRMATION PROCEDURE
1.
Drive the vehicle at 7
±
4 km/h or more.
2.
Check “Self diagnostic result” with CONSULT-III.
Is the DTC detected?
YES
>> Perform diagnosis procedure. Refer to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000005249671
1.
CHECK DTC WITH “BCM”
Check “Self diagnostic result” for BCM with CONSULT-III.
Is the either DTC B2601,B2602, B2603, B2604 or B2605 detected?
YES
>> Check the DTC. Refer to
NO
>> GO TO 2.
2.
CHECK DTC WITH “METER/M&A”
Check “Self diagnostic result” for METER/M&A with CONSULT-III.
Is the DTC detected?
YES
>> Check the DTC. Refer to
NO
>> GO TO 3.
3.
CHECK DETENTION SWITCH SIGNAL
1.
Turn ignition switch ON.
2.
Select “DETENT SW” in “Data Monitor” mode with CONSULT-III.
3.
Check detention switch signal under the following condition.
Is the status normal?
YES
>> GO TO 5.
NO
>> GO TO 4.
4.
CHECK DETENTION SWITCH CIRCUIT
DTC No.
Trouble diagnosis
name
DTC detecting condition
Possible cause
B2126
DETENT SW
Selector lever is in P position and the vehicle speed
of 7
±
4 km/h is detected.
• Harness and connectors
(Detention switch circuit is
opened/shorted.)
• Detention switch
• Unified meter and A/C amp.
(CAN communication)
Monitor item
Condition
Status
DETENT SW
selector lever
P position
OFF
Other than above
ON
B2126 DETENT SW
ADP-57
< DTC/CIRCUIT DIAGNOSIS >
C
D
E
F
G
H
I
K
L
M
A
B
ADP
N
O
P
1.
Turn ignition switch OFF.
2.
Disconnect driver seat control unit and A/T shift selector connector.
3.
Check continuity between driver seat control unit harness connector and A/T shift selector harness con-
nector.
4.
Check continuity between driver seat control unit harness connector and ground.
Is the inspection result normal?
YES
>> Replace driver seat control unit. Refer to
ADP-215, "Removal and Installation"
.
NO
>> Repair or replace harness.
5.
CHECK INTERMITTENT INCIDENT
GI-36, "Intermittent Incident"
.
>> INSPECTION END
Driver seat control unit
A/T shift selector
Continuity
Connector
Terminal
Connector
Terminal
B451
21
M137
11
Existed
Driver seat control unit
Ground
Continuity
Connector
Terminal
B451
21
Not existed
ADP-58
< DTC/CIRCUIT DIAGNOSIS >
B2128 UART COMMUNICATION LINE
B2128 UART COMMUNICATION LINE
Description
INFOID:0000000005249672
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:0000000005249673
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
RERFORM DTC CONFIRMATION PROCEDURE
1.
Turn ignition switch ON.
2.
Operate tilt & telescopic switch for more than 2 seconds.
3.
Check “Self diagnostic result” with CONSULT-III.
Is the DTC detected?
YES
>> Perform diagnosis procedure. Refer to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000005249674
1.
CHECK UART COMMUNICATION LINE CONTINUITY
1.
Turn ignition switch OFF.
2.
Disconnect driver seat control unit 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.
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-36, "Intermittent Incident"
.
NO
>> Repair or replace harness.
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
B2128
UART COMM
The communication between driver seat control unit
and automatic drive positioner control unit is interrupt-
ed 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
Automatic drive positioner control unit
Continuity
Connector
Terminal
Connector
Terminal
B451
1
M51
10
Existed
17
26
Driver seat control unit
Ground
Continuity
Connector
Terminal
B451
1
Not existed
17
POWER SUPPLY AND GROUND CIRCUIT
ADP-59
< DTC/CIRCUIT DIAGNOSIS >
C
D
E
F
G
H
I
K
L
M
A
B
ADP
N
O
P
POWER SUPPLY AND GROUND CIRCUIT
BCM
BCM : Diagnosis Procedure
INFOID:0000000005249675
1.
CHECK FUSE AND FUSIBLE LINK
Check that the following fuse and fusible link are not blown.
Is the fuse fusing?
YES
>> Replace the blown fuse or fusible link after repairing the affected circuit if a fuse or fusible link is
blown.
NO
>> GO TO 2.
2.
CHECK POWER SUPPLY CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect BCM connectors.
3.
Check voltage between BCM harness connector and ground.
Is the measurement value normal?
YES
>> GO TO 3.
NO
>> Repair or replace harness.
3.
CHECK GROUND CIRCUIT
Check continuity between BCM harness connector and ground.
Does continuity exist?
YES
>> INSPECTION END
NO
>> Repair or replace harness.
DRIVER SEAT CONTROL UNIT
DRIVER SEAT CONTROL UNIT : Diagnosis Procedure
INFOID:0000000005249676
NOTE:
Do not disconnect the battery negative terminal and the driver seat control unit connector until DTC is con-
firmed with CONSULT-III.
1.
CHECK POWER SUPPLY CIRCUIT
1.
Turn ignition switch OFF.
2.
Check voltage between driver seat control unit harness connector and ground.
Signal name
Fuse and fusible link No.
Battery power supply
L
10
(+)
(
−
)
Voltage
(Approx.)
BCM
Connector
Terminal
M118
1
Ground
Battery voltage
M119
11
BCM
Ground
Continuity
Connector
Terminal
M119
13
Existed
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