Infiniti QX56 (Z62). Manual - part 1085

 

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Infiniti QX56 (Z62). Manual - part 1085

 

 

SBC-40

< DTC/CIRCUIT DIAGNOSIS >

B2453 BR STROKE SEN CIRC

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace brake pedal stroke sensor. Refer to 

SBC-63, "Removal and Installation"

.

Brake pedal stroke sensor

Condition

Resistance (k

)

(Approx.)

Terminal

2

1

Brake released 

 depressed

1.0 

 0.2

3

0.2 

 1.0

B2454 SEAT BLT PWR DR CIRC

SBC-41

< DTC/CIRCUIT DIAGNOSIS >

C

D

E

F

G

I

J

K

L

M

A

B

SBC

N

O

P

B2454 SEAT BLT PWR DR CIRC

DTC Logic

INFOID:0000000006237906

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-41, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006237907

1.

CHECK FUSE

1.

Turn ignition switch OFF.

2.

Check 30 A fuse (No. 83).

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Replace the blown fuse after repairing the affected circuit if a fuse is blown.

2.

CHECK PRE-CRASH SEAT BELT MOTOR POWER SUPPLY

1.

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

2.

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

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace harness or connector.

3.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-40, "Intermittent Incident"

.

>> INSPECTION END

DTC No.

Self-diagnosis item

DTC Detection Condition

Possible causes

B2454

SEAT BLT PWR DR CIRC

Seat belt motor (driver side) power supply cir-
cuit is open or shorted

• Harness or connectors

[Pre-crash seat belt control unit (driver 
side) circuit is open or shorted] 

• Pre-crash seat belt control unit (driver side) 

Pre-crash seat belt control unit (driver side)

Ground

Voltage (V)

Connector

Terminal

Battery voltage

B9

19

SBC-42

< DTC/CIRCUIT DIAGNOSIS >

B2455 CONTROL UNIT DR

B2455 CONTROL UNIT DR

DTC Logic

INFOID:0000000006237908

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-42, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006237909

1.

.INSPECTION START

1.

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

2.

Touch “ERASE”.

3.

Perform DTC Confirmation Procedure.
See 

SBC-42, "DTC Logic"

.

Is DTC B2455 displayed again?

YES

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

NO

>> GO TO 2.

2.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-40, "Intermittent Incident"

.

>> INSPECTION END

DTC No.

Self-diagnosis item

DTC Detection Condition

Possible causes

B2455

CONTROL UNIT DR

Pre-crash seat belt control unit (driver side) inter-
nal circuit malfunction 

Pre-crash seat belt control unit (driver side) 

B2456 SEAT BLT PWR AS

SBC-43

< DTC/CIRCUIT DIAGNOSIS >

C

D

E

F

G

I

J

K

L

M

A

B

SBC

N

O

P

B2456 SEAT BLT PWR AS

DTC Logic

INFOID:0000000006237910

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-43, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006237911

1.

CHECK FUSE AND FUSIBLE LINK

1.

Turn ignition switch OFF.

2.

Check 30 A fuse (No.77).

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Replace the blown fuse after repairing the affected circuit if a fuse is blown.

2.

CHECK PRE-CRASH SEAT BELT MOTOR POWER SUPPLY

1.

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

2.

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

Is the inspection result normal?

YES

>> GO TO 3.

NO

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

3.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-40, "Intermittent Incident"

.

>> INSPECTION END

DTC No.

Self-diagnosis item

DTC Detection Condition

Possible causes

B2456

SEAT BLT PWR AS 
CIRC

Pre-crash seat belt control unit (passenger side) 
power supply circuit is open or shorted

• Harness or connectors

[Pre-crash seat belt control unit (pas-
senger side) circuit is open or shorted] 

• Pre-crash seat belt control unit (pas-

senger side) 

Pre-crash seat belt control unit (passenger side)

Ground

Voltage (V)

(Approx.)

Connector

Terminal

Battery voltage

B231

19

 

 

 

 

 

 

 

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