Infiniti EX35. Manual - part 16

ADP-58

< COMPONENT DIAGNOSIS >

B2128 UART COMMUNICATION LINE

B2128 UART COMMUNICATION LINE

Description

INFOID:0000000003134668

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

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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:0000000003134670

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-38, "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 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

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

< COMPONENT 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:0000000003134671

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 harness or connector.

3.

CHECK GROUND CIRCUIT

Check continuity between BCM harness connector and ground.

Does continuity exist?

YES

>> INSPECTION END

NO

>> Repair harness or connector.

DRIVER SEAT CONTROL UNIT

DRIVER SEAT CONTROL UNIT : Diagnosis Procedure

INFOID:0000000003134673

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

K

10

(+)

(

−

)

Voltage

(Approx.)

BCM

Connector

Terminal

M118

1

Ground

Battery voltage

M119

11

BCM

Ground

Continuity

Connector

Terminal

M119

13

Existed

ADP-60

< COMPONENT DIAGNOSIS >

POWER SUPPLY AND GROUND CIRCUIT

Is the inspection result normal?

YES

>> GO TO 2.

NO

>>

Check the following.

• Repair or replace harness between driver seat control unit and fuse block (J/B).
• Circuit breaker.

2.

CHECK GROUND CIRCUIT

Check continuity between the driver seat control unit harness connector and ground.

Is the inspection result normal?

YES

>> Driver seat control unit power supply and ground circuit are OK.

NO

>> Repair or replace harness between driver seat control unit and ground.

DRIVER SEAT CONTROL UNIT : Special Repair Requirement

INFOID:0000000003134674

1.

PERFORM ADDITIONAL SERVICE

Perform additional service when removing battery negative terminal.

>> Refer to 

ADP-8, "ADDITIONAL SERVICE WHEN REMOVING BATTERY NEGATIVE TERMINAL

: Description"

.

AUTOMATIC DRIVE POSITIONER CONTROL UNIT

AUTOMATIC DRIVE POSITIONER CONTROL UNIT : Diagnosis Procedure

INFOID:0000000003134675

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 automatic drive positioner control unit harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace harness between automatic drive positioner control unit and fuse block (J/B).

2.

CHECK GROUND CIRCUIT

Check continuity between the automatic drive positioner control unit harness connector and ground.

(+)

(–)

Voltage (V)

(Approx.)

Driver seat control unit

Connector

Terminal

B452

33

Ground

Battery voltage

40

Driver seat control unit

Ground

Continuity

Connector

Terminal

B451

32

Existed

B452

48

(+)

(–)

Voltage (V)

(Approx.)

Automatic drive positioner control unit

Connector

Terminal

M52

34

Ground

Battery voltage

39

POWER SUPPLY AND GROUND CIRCUIT

ADP-61

< COMPONENT DIAGNOSIS >

C

D

E

F

G

H

I

K

L

M

A

B

ADP

N

O

P

Is the inspection result normal?

YES

>> Automatic drive positioner control unit power supply and ground circuit are OK.

NO

>> Repair or replace harness between automatic drive positioner control unit and ground.

AUTOMATIC DRIVE POSITIONER CONTROL UNIT : Special Repair Requirement

INFOID:0000000003134676

1.

PERFORM ADDITIONAL SERVICE

Perform additional service when removing battery negative terminal.

>> Refer to 

ADP-8, "ADDITIONAL SERVICE WHEN REMOVING BATTERY NEGATIVE TERMINAL

: Description"

.

Automatic drive positioner control unit

Ground

Continuity

Connector

Terminal

M52

40

Existed

48