Infiniti FX35, FX50 (S51). Manual - part 16

 

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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 

ADP-56, "Diagnosis Procedure"

.

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 

BCS-78, "DTC Index"

.

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 

MWI-119, "DTC Index"

.

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

Refer to 

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 

ADP-58, "Diagnosis Procedure"

.

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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