Infiniti FX35, FX50 (S51). Manual - part 1592

SBC-26

< DTC/CIRCUIT DIAGNOSIS >

B2458 LOCAL COMM

B2458 LOCAL COMM

Description

INFOID:0000000005241732

Consists of driver seat side control unit and passenger seat side control unit.

DTC Logic

INFOID:0000000005241733

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

SELF-DIAGNOSIS WITH PRE-CRASH SEAT BELT CONTROL UNIT

1.

Turn ignition switch ON.

2.

Check “Self-diagnostic result” with CONSULT-III.

Is DTC detected?

YES

>> Refer to 

SBC-26, "Diagnosis Procedure"

.

NO

>> INSPECTIN END

Diagnosis Procedure

INFOID:0000000005241734

1.

CHECK PRE-CRASH-SEAT BELT CONTROL UNIT (PASSENGER SIDE) 

Check pre-crash seat belt control unit (passenger side) power supply. Refer to 

SBC-23, "Diagnosis Proce-

dure"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace harness between pre-crash seat belt control unit (passenger side) connector

and fusible link.

2.

CHECK LOCAL COMMUNICATION LINE CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect pre-crash seat belt control unit (driver side and passenger side) connector.

3.

Check continuity between local communication line harness connector.

4.

Check continuity between pre-crash seat belt control unit (driver side) harness connector and ground.

DTC No.

Self-diagnosis 

item

DTC Detection Condition

Possible causes

B2458

LOCAL 

COMM

Receipt of a malfunction signal between driver seat 
side control unit and passenger seat side control unit

• Local communication line between driver side 

control unit and passenger side control unit is 
open circuit, short, short to power supply, or 
short to ground

• Driver side pre-crash seat belt control unit inter-

nal circuit malfunction

• Passenger side pre-crash seat belt control unit 

internal circuit malfunction

• Power supply is not supplied to pre-crash seat 

belt control unit (passenger side)

Pre-crash seat belt control unit (driver side)

Pre-crash seat belt control unit (passenger side)

Continuity

Connector

Terminal

Connector

Terminal

B9

8

B211

8

Existed

16

16

Pre-crash seat belt control unit (driver side)

Ground

Continuity

Connector

Terminal

B9

8

Not existed

16

B2458 LOCAL COMM

SBC-27

< DTC/CIRCUIT DIAGNOSIS >

C

D

E

F

G

I

J

K

L

M

A

B

SBC

N

O

P

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace local communication line.

3.

REPLACE PRE-CRASH SEAT BELT CONTROL UNIT (PASSENGER SIDE)

1.

Replace pre-crash seat belt control unit (passenger side)

2.

Check “Self-diagnostic result” with CONSULT-III.

Is DTC detected?

YES

>> GO TO 4.

NO

>> INSPECTION END

4.

REPLACE PRE-CRASH SEAT BELT CONTROL UNIT (DRIVER SIDE)

1.

Replace pre-crash seat belt control unit (driver side)

2.

Check “Self-diagnostic result” with CONSULT-III.

Is DTC detected?

YES

>> GO TO 5.

NO

>> INSPECTION END

5.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-36, "Intermittent Incident"

.

>> INSPECTION END

SBC-28

< DTC/CIRCUIT DIAGNOSIS >

B2461 VHCL SPEED SIGNAL

B2461 VHCL SPEED SIGNAL

Description

INFOID:0000000005241735

Inputs the vehicle speed signal from UNIFIDE METER AND A/C AMP. via CAN communication.

DTC Logic

INFOID:0000000005241736

DTC DETECTION LOGIC

NOTE:
If DTC B2461 is displayed with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to 

SBC-

14, "DTC Logic"

.

DTC CONFIRMATION PROCEDURE

1.

SELF-DIAGNOSIS WITH PRE-CRASH SEAT BELT CONTROL UNIT

1.

Turn ignition switch ON.

2.

Check “Self-diagnostic result” with CONSULT-III.

Is DTC detected?

YES

>> Refer to 

SBC-28, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000005241737

1.

CHECK DTC WITH “UNIFIED METER AND A/C AMP.”

Check “Self-diagnostic result” for “METER/M&A” with CONSULT-III. Refer to 

MWI-45, "CONSULT-III Function

(METER/M&A)"

.

Is DTC detected?

YES

>> Repair or replace malfunctioning parts.

NO

>> GO TO 2.

2.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-36, "Intermittent Incident"

.

>> INSPECTION END

DTC No.

Self-diagnosis item

DTC Detection Condition

Possible causes

B2461

VHCL SPEED SIG-

NAL

Receipt of a malfunction signal of the vehicle speed signal

UNIFIDE METER AND A/C AMP.

B2462 VHCL DISTANCE SIGNAL

SBC-29

< DTC/CIRCUIT DIAGNOSIS >

C

D

E

F

G

I

J

K

L

M

A

B

SBC

N

O

P

B2462 VHCL DISTANCE SIGNAL

Description

INFOID:0000000005241738

Inputs the distance signal of two vehicles from ICC sensor integrated unit via CAN communication.

DTC Logic

INFOID:0000000005241739

DTC DETECTION LOGIC

NOTE:
If DTC B2462 is displayed with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to 

SBC-

14, "DTC Logic"

.

DTC CONFIRMATION PROCEDURE

1.

SELF-DIAGNOSIS WITH PRE-CRASH SEAT BELT CONTROL UNIT

1.

Turn ignition switch ON.

2.

Check “Self-diagnostic result” with CONSULT-III.

Is DTC detected?

YES

>> Refer to 

SBC-29, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000005241740

1.

CHECK DTC WITH “ICC SENSOOR INTEGRATED UNIT”

Check “Self-diagnostic result” for “ICC” with CONSULT-III. Refer to 

CCS-45, "CONSULT-III Function (ICC)"

.

Is DTC detected?

YES

>> Repair or replace malfunctioning parts.

NO

>> GO TO 2.

2.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-36, "Intermittent Incident"

.

>> INSPECTION END

DTC No.

Self-diagnosis item

DTC Detection Condition

Possible causes

B2462

VHCL DISTANCE SIGNAL

Receipt of a malfunction signal of the dis-
tance signal between two vehicles

ICC sensor integrated unit