Infiniti Q45. Manual - part 786

PRE-CRASH SEAT BELT

SB-23

Touch “PRECRASH SEATBELT”.
If “PRECRASH SEATBELT” is not indicated, refer to

"CONSULT-II Data Link Connector (DLC) Circuit"

Select diagnosis mode.
“SELF-DIAG RESULTS”, “DATA MONITOR”, “CAN DIAG SUP-
PORT MNTR“ and “ECU PART NUMBER” are available.

SELF-DIAGNOSIS RESULTS
Display Item List

DATA MONITOR
Display Item List

BCIA0030E

BCIA0031E

CONSULT-II display

Item

Malfunction is detected when...

Reference

page

CAN COMM CIRCUIT [U1000]

CAN communication

Malfunction is detected in CAN communication.

SB-24

SB MOTOR RH CIRC [B2451]

Seat belt motor RH

Circuit of seat belt motor (RH) is open or shorted.

SB-33

SB MOTOR LH CIRC [B2452]

Seat belt motor LH

Circuit of seat belt motor (LH) is open or shorted.

SB-32

BR STROKE SEN CIRC [B2453]

Brake pedal stroke sensor

Circuit of brake pedal stroke sensor is open or shorted.

SB-30

MOTOR PWR SUP CIRC [B2454]

Motor power supply circuit

Circuit of motor power supply is open or shorted.

SB-25

PSB C/U INT CIRCUIT [B2455]

ECU circuit

ECU circuit internal abnormality

–

Monitor item [OPERATION or UNIT]

Contents

SB SW RH SIG

“ON/OFF”

RH seat belt switch signal is displayed.

SB SW LH SIG

“ON/OFF”

LH seat belt switch signal is displayed.

VHCL SPEED SE

“Km/h”

Vehicle speed signal is displayed.

B PEDAL SIG1

“V”

Brake pedal stroke sensor 1 signal voltage is displayed.

B PEDAL SIG 2

“V”

Brake pedal stroke sensor 2 signal voltage is displayed.

SB-24

PRE-CRASH SEAT BELT

Preliminary Check

NHS0003U

PRE-CRASH SEAT BELT OPERATION INSPECTION

WARNING:

●

The following tests should be performed in a safe, open place that is free of traffic and obstacles.

●

The tests should be performed on a dry, paved road. Do not attempt the tests on wet or unpaved
road, open road, or highway. (This may cause an accident or personal injury.)

●

Driver and passenger assume it will not operate and prepare themselves accordingly.

Tighten driver and passenger seat belts.

Drive at approximately 25 km/h (16 MPH).

Notify passenger of a sudden stop. Driver and passenger prepare themselves for the possibility of
system not operating. Then, driver fully depresses the brake pedal to stop suddenly.

Make sure that the shoulder of the seat belt is pulled while braking.

Diagnoses Symptom Chart

NHS0003V

Check CAN Communication Circuit [U1000]

NHS0003W

CHECK SELF-DIAGNOSTIC RESULT

CAUTION:

If CONSULT-II is used with no connection of CONSULT-II CONVERTER, malfunctions might be
detected in self-diagnosis depending on control unit which carry out CAN communication.

With CONSULT-II

Connect CONSULT-II, and turn ignition switch ON.

Touch “PRECRASH SEATBELT” on “SELECT SYSTEM”
screen.

Touch “SELF-DIAG RESULTS” on “SELECT DIAG MODE”
screen.

Check display content in self-diagnostic results.

Displayed U1000?

Yes

>> GO TO

LAN-17, "Precautions When Using CONSULT-

II"

>> Inspection END.

Symptom

Diagnosis procedure

Reference

page

All functions of pre-crash seat belt system does not operate.

Check ignition power supply circuit

SB-25

Check motor power supply and ground circuit

SB-25

Check CAN communication circuit

SB-24

Replace pre-crash seat belt control unit.

SB-11

Driver side pre-crash seat belt system does not operate.

Check seat belt buckle switch (driver side) circuit

SB-27

Check pre-crash seat belt motor LH

SB-32

Replace pre-crash seat belt control unit.

SB-11

Passenger side pre-crash seat belt system does not operate.

Check seat belt buckle switch (passenger side) circuit

SB-28

Check pre-crash seat belt motor RH

SB-33

Replace pre-crash seat belt control unit.

SB-11

Pre-crash seat belt system does not operate during emergency
brake operation.

Check CAN communication circuit

SB-24

Check brake pedal stroke sensor circuit

SB-30

Check brake pedal stroke sensor shield wire circuit

SB-34

Replace pre-crash seat belt control unit.

SB-11

PHIA0772E

PRE-CRASH SEAT BELT

SB-25

Check Ignition Power Supply Circuit

NHS0003X

CHECK FUSE

Check 10A fuse [No.1, located in fuse block (J/B)].
NOTE:
Refer to

SB-11, "Component Parts and Harness Connector Location"

OK or NG

>> GO TO 2.

>> If fuse is blown out, be sure to eliminate cause of malfunction before installing new fuse. Refer to

PG-2, "POWER SUPPLY ROUTING"

CHECK IGNITION POWER SUPPLY CIRCUIT

Turn ignition switch ON.

Check voltage between pre-crash seat belt control unit harness
connector B318 terminal 13 and ground.

OK or NG

>> Ignition power supply circuit is OK.

>> Check pre-crash seat belt control unit ignition power

supply circuit harness.

Check Motor Power Supply and Ground Circuit [B2454]

NHS0003Y

CHECK FUSE

Check 30A fusible link (letter D , located in the fuse and fusible link box).

NOTE:
Refer to

SB-11, "Component Parts and Harness Connector Location"

OK or NG

>> GO TO 2.

>> If fuse is blown out, be sure to eliminate cause of malfunction before installing new fuse. Refer to

PG-2, "POWER SUPPLY ROUTING"

CHECK MOTOR POWER SUPPLY CIRCUIT 1

With CONSULT-II

Select “SELF-DIAG RESULTS” and then make sure the “MOTOR
PWR SUP CIRC” is displayed.

Without CONSULT-II

When CONSULT-II is not used, omit this inspection, and then GO TO 3.
Displayed B2454?

Yes

>> GO TO 3.

>> Motor power supply system is normal.

13 (W/B) – Ground

: Battery voltage

PHIA0743E

CONSULT-II display

CONSULT-II display code

NO DTC

–

MOTOR PWR SUP CIRC

B2454

PHIA0770E

SB-26

PRE-CRASH SEAT BELT

CHECK MOTOR POWER SUPPLY CIRCUIT 2

Check voltage between pre-crash seat belt control unit harness con-
nector B318 terminal 2 and ground.

OK or NG

>> GO TO 4.

>> Repair or replace harness.

CHECK PRE-CRASH SEAT BELT CONTROL UNIT GROUND CIRCUIT

Turn ignition switch OFF.

Disconnect pre-crash seat belt control unit connector.

Check continuity between pre-crash seat belt control unit har-
ness connector B318 terminals 5, 26 and ground.

OK or NG

>> Motor power supply and ground circuit is OK.

>> Repair or replace harness.

2 (G/R) – Ground

: Battery voltage

PHIA0744E

5 (B) – Ground

: Continuity should exist.

26 (B) – Ground

: Continuity should exist.

PHIA0745E

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