Infiniti FX35, FX50 (S51). Manual - part 13

ADP-44

< SYSTEM DESCRIPTION >

DIAGNOSIS SYSTEM (DRIVER SEAT C/U)

WORK SUPPORT

MIRROR MOTOR LH

Activates/deactivates the mirror motor (driver side).

MEMORY SW INDCTR

Turns ON/OFF the memory indicator.

Test item

Description

Work item

Content

Item

SEAT SLIDE VOLUME SET

The amount of seat sliding for entry/exit assist can be selected 
from 3 items.

40 mm

80 mm

150 mm

EXIT TILT SETTING

Entry/exit assist (steering column) can be selected: 
ON (operated) – OFF (not operated)

ON

OFF

EXIT SEAT SLIDE SETTING

Entry/exit assist (seat) can be selected: 
ON (operated) – OFF (not operated)

ON

OFF

U1000 CAN COMM CIRCUIT

ADP-45

< DTC/CIRCUIT DIAGNOSIS >

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DTC/CIRCUIT DIAGNOSIS

U1000 CAN COMM CIRCUIT

Description

INFOID:0000000005249653

CAN (Controller Area Network) is a serial communication line for real time applications. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Modern
vehicle is equipped with many electronic control unit, and each control unit shares information and links with
other control units during operation (not independent). In CAN communication, control units are connected
with 2 communication lines (CAN H-line, CAN L-line) allowing a high rate of information transmission with less
wiring. Each control unit transmits/receives data but selectively reads required data only.

DTC Logic

INFOID:0000000005249654

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

STEP 1

Turn ignition switch ON and wait at least 3 seconds.

>> GO TO 2.

2.

STEP 2

Check “Self diagnostic result” with CONSULT-III.

Is the DTC detected?

YES

>> Perform diagnosis procedure. Refer to 

ADP-45, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000005249655

Refer to 

LAN-20, "Trouble Diagnosis Flow Chart"

.

Special Repair Requirement

INFOID:0000000005249656

Refer to 

ADP-9, "SYSTEM INITIALIZATION : Description"

.

DTC

Trouble diagnosis 

name

DTC detecting condition

Possible cause

U1000

CAN COMM CIR-
CUIT

• Driver seat control unit cannot communicate to other 

control units.

• Driver seat control unit cannot communicate for more 

than the specified time.

• Harness or connectors

(CAN communication line is 
open or shorted)

ADP-46

< DTC/CIRCUIT DIAGNOSIS >

B2112 SLIDING MOTOR

B2112 SLIDING MOTOR

Description

INFOID:0000000005249657

• The seat sliding motor is installed to the seat cushion frame.
• The seat sliding motor is installed with the driver seat control unit.
• Slides the seat forward/backward by changing the rotation direction of sliding motor.

DTC Logic

INFOID:0000000005249658

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

RERFORM DTC CONFIRMATION PROCEDURE

1.

Turn ignition switch ON.

2.

Check “Self diagnostic result” with CONSULT-III.

Is the DTC detected? 

YES

>> Perform diagnosis procedure. Refer to 

ADP-46, "Diagnosis Procedure"

.

NO

>> INSPECTION END

NOTE:
First perform diagnosis for B2126 if B2126 is detected.

Diagnosis Procedure

INFOID:0000000005249659

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-46, "DTC Logic"

.

Is the DTC displayed again?

YES

>> GO TO 2.

NO

>> Check intermittent incident. Refer to 

GI-36, "Intermittent Incident"

.

2.

CHECK SLIDING MOTOR CIRCUIT (POWER SHORT)

1.

Turn ignition switch OFF.

2.

Disconnect sliding motor and driver seat control unit connector.

3.

Check voltage between sliding motor harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace harness.

3.

CHECK DRIVER SEAT CONTROL UNIT OUTPUT SIGNAL 

1.

Connect driver seat control unit connector.

2.

Check voltage between driver seat control unit harness connector and ground.

DTC No.

Trouble diagnosis 

name

DTC detecting condition

Possible cause

B2112

SEAT SLIDE

The driver seat control unit detects the output of slid-
ing motor output terminal for 0.1 second or more 
even if the sliding switch is not input.

• Driver seat control unit
• Slide motor harness is power 

shorted

(+)

(–)

Voltage (V)

(Approx.)

Sliding motor

Connector

Terminals

B461

35

Ground

0

42

B2112 SLIDING MOTOR

ADP-47

< DTC/CIRCUIT DIAGNOSIS >

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Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Replace driver seat control unit. Refer to 

ADP-215, "Removal and Installation"

4.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-36, "Intermittent Incident"

.

>> INSPECTION END

(+)

(–)

Voltage (V)

(Approx.)

Driver seat control unit

Connector

Terminals

B451

35

Ground

0

42