Infiniti M35/M45 Y50. Manual - part 1038

PRE-CRASH SEAT BELT

SB-23

C

D

E

F

G

I

J

K

L

M

A

B

SB

3. 

CHECK BRAKE PEDAL STROKE SENSOR HARNESS

1.

Turn ignition switch OFF.

2.

Disconnect pre-crash seat belt control unit connector and brake pedal stroke sensor connector.

3.

Check continuity between pre-crash seat belt control unit har-
ness connector and brake pedal stroke sensor harness connec-
tor.

4.

Check continuity between pre-crash seat belt control unit harness connector and ground.

OK or NG

OK

>> GO TO 4.

NG

>> Repair or replace harness between pre-crash seat belt control unit and brake pedal stroke sensor.

4. 

CHECK BRAKE PEDAL STROKE SENSOR POWER SUPPLY

1.

Connect pre-crash seat belt control unit connector.

2.

Turn ignition switch ON.

3.

Check voltage between pre-crash seat belt control unit harness
connector and ground.

OK or NG

OK

>> GO TO 5.

NG

>> Replace pre-crash seat belt control unit.

A

B

Continuity 

Pre-crash seat 

belt control unit 

connector

Terminal

Brake pedal stroke 

sensor connector

Terminal

 B142

16

 E125

1

Yes

18

2

20 3

21

4

A

Ground

Continuity 

Pre-crash seat belt 

control unit connector

Terminal

B142

16 

No

18

20

21

PHIA1135E

Terminal

Voltage (V)

(Approx.)

(+)

(–)

Pre-crash seat 

belt control unit 

connector

Terminal 

B142

18

Ground

5

PHIA1136E

SB-24

PRE-CRASH SEAT BELT

5. 

CHECK BRAKE PEDAL STROKE SENSOR

Check continuity between brake pedal stroke sensor while perform-
ing brake operation.

OK or NG

OK

>> Check harness connection.

●

If it is OK, replace pre-crash seat belt control unit.

●

If it is NG, repair or replace malfunction part.

NG

>> Replace brake pedal stroke sensor.

Check Pre-Crash Seat Belt Motor LH Circuit [B2452]

NHS0008E

1. 

CHECK SELF-DIAGNOSTIC RESULT

 With CONSULT-II

Select “SELF-DIAG RESULTS” of CONSULT-II, and then make sure
that “SB MOTOR LH CIRC” is displayed.

 Without CONSULT-II

When CONSULT-II is not used, omit this inspection, and then GO TO 2.
Displayed B2452?

Yes

>> GO TO 2.

No

>> Pre-crash seat belt motor LH circuit is OK.

Brake pedal stroke 

sensor connector

Terminal Condition

Resistance

(K

Ω

)

(Approx.)

E125

2

1

Brake released 

→

 depressed

1.0 

→

 0.2

3

0.2 

→

 1.0

PHIA1137E

CONSULT-II display

CONSULT-II display code

NO DTC

—

SB MOTOR LH CIRC

B2452

PHIA0768E

PRE-CRASH SEAT BELT

SB-25

C

D

E

F

G

I

J

K

L

M

A

B

SB

2. 

CHECK SEAT BELT MOTOR LH HARNESS

1.

Turn ignition switch OFF.

2.

Disconnect pre-crash seat belt control unit connector and pre-crash seat belt motor LH connector.

3.

Check continuity between pre-crash seat belt control unit har-
ness connector and pre-crash seat belt motor LH harness con-
nector.

4.

Check continuity between pre-crash seat belt control unit har-
ness connector and ground.

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace harness.

3. 

CHECK SEAT BELT MOTOR LH

 Check continuity between pre-crash seat belt motor LH.

OK or NG

OK

>> Replace pre-crash seat belt control unit.

NG

>> Replace pre-crash seat belt motor LH.

A

B

Continuity 

Pre-crash seat 

belt control unit 

connector

Terminal

Pre-crash seat 

belt motor LH 

connector

Terminal

B142

4 

 B32

1 

Yes

6

2 

A

Ground

Continuity 

Pre-crash seat belt 

control unit connector

Terminal

B142

4 

No

6

PHIA1138E

Pre-crash seat belt 

motor LH connector

Terminal Continuity 

B32

1

2

Yes

PHIA1139E

SB-26

PRE-CRASH SEAT BELT

Check Pre-Crash Seat Belt Motor RH Circuit [B2451]

NHS0008F

1. 

CHECK SELF-DIAGNOSTIC RESULT

 With CONSULT-II

Select SELF-DIAG RESULTS” of CONSULT-II, and then make sure
that “SB MOTOR RH CIRC” is displayed.

 Without CONSULT-II

When CONSULT-II is not used, omit this inspection, and then GO TO 2.

Displayed B2451?

Yes

>> GO TO 2.

No

>> Pre-crash seat belt motor RH circuit is OK.

2. 

CHECK SEAT BELT MOTOR RH HARNESS

1.

Turn ignition switch OFF.

2.

Disconnect pre-crash seat belt control unit connector and pre-crash seat belt motor RH connector.

3.

Check continuity between pre-crash seat belt control unit har-
ness connector and pre-crash seat belt motor RH harness con-
nector.

4.

Check continuity between pre-crash seat belt control unit har-
ness connector and ground.

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace harness.

CONSULT-II display

CONSULT-II display code

NO DTC

—

SB MOTOR RH CIRC

B2451

PHIA0767E

A

B

Continuity 

Pre-crash seat 

belt control unit 

connector

Terminal

Pre-crash seat 

belt motor RH 

connector

Terminal

B142

1

B422

2 

Yes

3 1

A

Ground

Continuity 

Pre-crash seat belt 

control unit connector

Terminal

 B142

1 

No

3 

PHIA1140E