Infiniti M35/M45 Y50. Manual - part 1039

PRE-CRASH SEAT BELT

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3. 

CHECK SEAT BELT MOTOR RH

 Check continuity between pre-crash seat belt motor RH.

OK or NG

OK

>> Replace pre-crash seat belt control unit.

NG

>> Replace pre-crash seat belt motor RH.

Check Brake Pedal Stroke Sensor Shield Wire Circuit 

NHS0008G

1. 

CHECK PRE-CRASH SEAT BELT INPUT SIGNAL

 With CONSULT-II

Select “B PEDAL SIG1 and 2” on DATA MONITOR screen, and then
make sure that the voltage does not change if brake pedal is not
operated.

NOTE:
Diagnosis should be performed with engine running, audio and air
conditioner operating.

 Without CONSULT-II

1.

Start engine.

2.

Check voltage between pre-crash seat belt harness connector.

OK or NG

OK

>> Brake pedal stroke sensor shield wire circuit is OK.

NG

>> Check shield wire for damage. Repair or replace if necessary.

Pre-crash seat belt 

motor RH connector

Terminal Continuity 

B422

1

2

Yes

PHIA1139E

B PEDAL SIG1

Brake released

:There is no change in the voltage 
value, and it is almost constant

B PEDAL SIG2

Brake released

:There is no change in the voltage 
value, and it is almost constant.

Terminal

Condition

Voltage (V)

(Approx.)

(+)

(–)

Pre-crash seat 

belt control unit 

connector

Terminal 

B142

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Ground

Performed with 
engine running, audio 
and air conditioner 
operating and brake 
pedal released.

There is no 
change in the 
voltage value, 
and it is almost 
constant

20

PHIA0766E

PHIA1141E

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PRE-CRASH SEAT BELT

Removal and Installation of Pre-Crash Seat Belt Control Unit

NHS0008H

REMOVAL

1.

Remove trunk side finisher LH. Refer to 

EI-56, "Removal and Installation for Trunk Room Trim"

 .

2.

Remove pre-crash seat belt control unit mounting bolts.

3.

Remove pre-crash seat belt control unit connector, and the pre-
crash seat belt control unit.

INSTALLATION

Install in the reverse order of removal.

PHIA1125E

SEAT BELTS

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SEAT BELTS

PFP:86884

System Description

NHS0008I

SEAT BELT WARNING CHIME

●

With ignition switch turned ON and seat belt unfastened (seat belt switch ON), warning chime will sound
for approximately 6 seconds.

●

If warning chime does not sound, refer to 

DI-73, "Seat Belt Buckle Switch Signal Inspection"

 .

SEAT BELT WARNING LAMP

●

Fasten driver's seat belt.

●

The seat belt warning lamp should go out.

●

If the seat belt warning lamp does not go out, refer to 

DI-42, "Wiring Diagram — WARN —"

 .

Removal and Installation of Front Seat Belt 

NHS0008J

CAUTION:

Before servicing SRS, turn the ignition switch off, disconnect both battery cables and wait at least 3
minutes.

REMOVAL OF SEAT BELT RETRACTOR 

1.

Remove the outer anchor.

●

Remove the belt tension sensor cover and cover protector (passenger side only).

●

Disconnect the belt tension sensor connector (passenger side only).

●

Remove the fixing bolt of the outer anchor.

1.

Outer anchor

2.

Shoulder anchor

3.

Pre-tensioner seat belt retractor

4.

Belt tension sensor cover (passen-
ger side only)

5.

Cover protector (passenger side 
only)

6.

Belt tension sensor connector (pas-
senger side only)

7.

Anchor bolt

8.

Anchor nut

9.

Seat belt pre-tensioner connector

10. Pre-crash seat belt connector

11.

Bolt

12. Seat belt adjuster

PHIA1106E

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SEAT BELTS

2.

Remove the shoulder anchor.

●

Remove the center pillar lower and upper garnishes, refer to 

EI-37, "BODY SIDE TRIM"

 .

●

Remove the fixing anchor nut of the shoulder anchor.

3.

Remove the seat bert assembly.

●

Disconnect the seat belt pre-tensioner connector.

CAUTION:

●

For installing/removing seat belt pre-tensioner connec-
tor, insert thin screwdriver wrapped in tape into notch,
lift lock and remove connector.

●

Install connector with lock raised, and push lock into
connector.

●

Disconnect the pre-crush seat belt connector (for only the vehicle with pre-clash seat belt).

●

Remove the fixing screw and anchor bolt of the pre-tensioner seat belt retractor.

INSTALLATION OF SEAT BELT RETRACTOR

●

Install in the reverse order of removal.

●

Tighten by specified torque.

REMOVAL OF SEAT BELT BUCKLE

Remove the seat belt buckle.

●

Remove the front seat from vehicle, refer to 

SE-168, "Removal

and Installation"

  (For ease of tool operation in narrow space).

●

Disconnect the seat belt buckle harness connector.

●

Remove the fixing anchor bolt of the seat belt buckle.

INSTALLATION OF SEAT BELT BUCKLE

●

Install in the reverse order of removal.

●

Tighten by specified torque.

PHIA0953J

Tightening torque

: 49.0 N·m (5.0 kg-m, 36 ft-lb)

PHIA0926J

Tightening torque

: 49.0 N·m (5.0 kg-m, 36 ft-lb)