Infiniti QX56 (Z62). Manual - part 17

B2113 RECLINING MOTOR

ADP-61

< DTC/CIRCUIT DIAGNOSIS >

C

D

E

F

G

H

I

K

L

M

A

B

ADP

N

O

P

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Replace driver seat control unit.

4.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-40, "Intermittent Incident"

.

>> INSPECTION END

(+)

(-)

Voltage (V)

(Approx.)

Driver seat control unit

Connector

Terminals

B451

35

Ground

0

39

ADP-62

< DTC/CIRCUIT DIAGNOSIS >

B2116 TILT MOTOR

B2116 TILT MOTOR

DTC Logic

INFOID:0000000006248346

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

STEP 1

Turn ignition switch ON.

>> GO TO 2.

2.

STEP 2

Check “Self diagnostic result” with CONSULT-III.
Is the DTC detected? 

YES

>> Perform diagnosis procedure. Refer to 

ADP-62, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006248347

1.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Turn ignition switch ON.

2.

Check “Self diagnostic result” with CONSULT-III.

3.

Erase the DTC.

4.

Perform DTC confirmation procedure. Refer to 

ADP-62, "DTC Logic"

.

Is the DTC displayed again?

YES

>> GO TO 2.

NO

>> Check intermittent incident. Refer to 

GI-40, "Intermittent Incident"

.

2.

CHECK TILT MOTOR CIRCUIT (POWER SHORT) 

1.

Turn ignition switch OFF.

2.

Disconnect automatic drive positioner control unit and tilt motor connector.

3.

Check voltage between tilt motor harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace harness or connector.

3.

CHECK AUTOMATIC DRIVER POSITIONER CONROL UNIT OUTPUT SIGNAL

1.

Connect automatic drive positioner control unit connector.

2.

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

DTC No.

Trouble diagnosis 

name

DTC detecting condition

Possible cause

B2116

STEERING TILT

The automatic drive positioner control unit detects 
the output of tilt motor output terminal for 0.1 second 
or more even if the tilt switch is not input.

• Automatic drive positioner con-

trol unit

• Tilt motor harness is shorted

(+)

(-)

Voltage (V)

(Approx.)

Tilt motor

Connector

Terminals

M116

1

Ground

0

2

B2116 TILT MOTOR

ADP-63

< DTC/CIRCUIT DIAGNOSIS >

C

D

E

F

G

H

I

K

L

M

A

B

ADP

N

O

P

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Replace automatic drive positioner control unit.

4.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-40, "Intermittent Incident"

.

>> INSPECTION END

(+)

(-)

Voltage (V)

(Approx.)

Automatic drive positioner control unit 

Connector

Terminals

M104

28

Ground

0

29

ADP-64

< DTC/CIRCUIT DIAGNOSIS >

B2128 UART COMMUNICATION LINE

B2128 UART COMMUNICATION LINE

Description

INFOID:0000000006248348

Driver seat control unit performs UART communication with the automatic drive positioner control unit using 1
communication lines. Driver seat control unit receives the operation signals of tilt & telescopic switch, door mir-
ror remote control switch, and the position signals of door mirror sensor from the automatic drive positioner
control unit and transmits the operation request signal.

DTC Logic

INFOID:0000000006248349

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

STEP 1

Turn ignition switch ON.

>> GO TO 2.

2.

PROCEDURE

Check “Self diagnostic result” with CONSULT-III.

Is the DTC detected? 

YES

>> Perform diagnosis procedure. Refer to 

ADP-64, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006248350

1.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Turn ignition switch ON.

2.

Check “Self diagnostic result” with CONSULT-III.

3.

Erase the DTC.

4.

Perform DTC confirmation procedure. Refer to 

ADP-62, "DTC Logic"

.

Is the DTC displayed again?

YES

>> GO TO 2.

NO

>> Check intermittent incident. Refer to 

GI-40, "Intermittent Incident"

.

2.

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.

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

B452

2

M75

8

Existed