2005 NISSAN X-TRAIL warning

BCS-6
TIME CONTROL UNIT

15 W/GSeat belt warning lamp
(passenger side)Seat belt warning lamp (passenger
side) is illuminated (seat belt is unfas-
tened).12V
Seat belt warning lamp (passenger
side) is not illuminated (seat belt is
unfastened).0V
16 B/R Ground — 0V
17 G Ignition switch (ON) — 12V
18 W/L Ignition key switch (Insert)Key inserted → key removed from Igni-
tion key cylinder12V → 0V
19 R/L Lighting switch 1ST, 2ND position: ON → OFF 12V → 0V
20 GY Door lock/unlock switch Neutral → Locked 5V → 0V
21 BR/WSeat belt buckle switch
(driver side)Seat belt buckle switch (driver side) is
unfastened.*20V
Seat belt buckle switch (driver side) is
fastened.*212V
22 G/ORSeat belt buckle switch
(passenger side)Seat belt buckle switch (passenger
side) is unfastened.0V
Seat belt buckle switch (passenger
side) is fastened.12V
23 PU Door lock/unlock switchNeutral → Door lock/Unlock switch is
pushed.5V → 0V
24 LG/RDoor key cylinder switch
(driver side)OFF (neutral) → ON (locked) 5V → 0V
25 GY/LDoor key cylinder switch
(driver side)OFF (neutral) → ON (unlocked) 5V → 0V
26 R/Y Interior room lampWhen interior room lamp is operated
using remote controller
(Lamp switch is “DOOR” position.)12V → 0V
27 G/W Rear window defogger relayOFF → ON
(Ignition key is “ON” position.)12V → 0V
28 Y/G Door unlock sensor (driver side) Driver door: Locked → Unlocked 10V → 0V
29*1 Y/LDoor unlock sensor
(passenger side)Passenger door: Locked → Unlocked 5V → 0V
30 SB Front door switch (driver side) OFF (closed) → ON (open) 5V → 0V
31 R/W Passenger and rear doors switch OFF (closed) → ON (open) 5V → 0V
32 OR Multi-remote control unitRemote controller lock button is pushed.
(Ignition switch is not “ON” position.)0V → 5V
33 P/L Multi-remote control unitRemote controller unlock button is
pushed.
(Ignition switch is not “ON” position.)0V → 5V
34 B/Y NATS release signal Ignition switch ON→OFF 0V → 5V Terminal
No.Wire
colorConnections Operation condition Voltage (Approximate values)

PRECAUTIONS
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PRECAUTIONSPFP:00001
Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT
BELT PRE-TENSIONER”
EGS001FF
The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. Information necessary to service the system safely is included in the SRS and SB section of
this Service Manual.
WARNING:

To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
in the event of a collision which would result in air bag inflation, all maintenance must be per-
formed by an authorized NISSAN/INFINITI dealer.

Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the SRS section.

Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or
harness connectors.
Precautions for Steering SystemEGS00049

In case of removing steering gear assembly, make the final tightening with grounded and unloaded vehi-
cle condition, and then check wheel alignment.

Observe the following precautions when disassembling.
–Before disassembly, thoroughly clean the outside of the unit.
–Disassembly should be done in a clean work area. It is important to prevent the internal parts from becom-
ing contaminated by dirt or other foreign matter.
–For easier and proper assembly, place disassembled parts in order on a parts rack.
–Use nylon cloth or paper towels to clean the parts; common shop rags can leave lint that might interfere
with their operation.
–Do not reuse non-reusable parts.
–Before assembling, apply the specified grease to the directed parts.

SB-1
SEAT BELTS
H RESTRAINTS
CONTENTS
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SECTION SB
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SEAT BELTS
PRECAUTIONS .......................................................... 2
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” .................................................................. 2
Precaution for Seat Belt Service .............................. 2
AFTER A COLLISION ........................................... 2
SEAT BELTS .............................................................. 3
Removal and Installation of Front Seat Belt ............. 3
REMOVAL ............................................................. 3
INSTALLATION ..................................................... 3
Removal and Installation of Rear Seat Belt ............. 4
REMOVAL/WITH 2-POINT TYPE REAR CEN-
TER SEAT BELT ................................................... 4
INSTALLATION/WITH 2-POINT TYPE REAR
CENTER SEAT BELT ........................................... 4
REMOVAL/WITH 3-POINT TYPE REAR CEN-
TER SEAT BELT ................................................... 4
INSTALLATION /WITH 3-POINT TYPE REAR
CENTER SEAT BELT ........................................... 5
SEAT BELT WARNING SYSTEM ............................... 6
Component Parts and Harness Connector Location ..... 6System Description ................................................... 6
SEAT BELT OPERATION ...................................... 6
SEAT BELT WARNING CHIME AND SEAT BELT
WARNING LAMP .................................................. 7
Time Chart for Seat Belt Warning Lamp and Chime ..... 7
Schematic ................................................................. 8
Wiring Diagram —S/WARN—/For LHD models ....... 9
Wiring Diagram —S/WARN—/For RHD models ..... 12
Terminal and Reference Value for Time Control Unit ... 15
Work Flow ............................................................... 16
Trouble Diagnosis Chart by Symptom .................... 16
Time Control Unit Power Supply and Ground Circuit
Check ..................................................................... 16
Seat Belt Warning Lamp Power Supply Check ...... 17
Seat Belt Warning Lamp Check (Driver side) ......... 17
Seat belt Warning Lamp Check (Passenger Side) ... 19
Seat Belt Buckle Switch Check .............................. 20
Seat Belt Buckle Switch and Seat Pressure Switch
Check ..................................................................... 22
Vehicle Speed Signal Inspection ............................ 24

SB-2
PRECAUTIONS

PRECAUTIONSPFP:00001
Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT
BELT PRE-TENSIONER”
EHS000MW
The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. Information necessary to service the system safely is included in the SRS and SB section of
this Service Manual.
WARNING:

To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
in the event of a collision which would result in air bag inflation, all maintenance must be per-
formed by an authorized NISSAN/INFINITI dealer.

Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the SRS section.

Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or
harness connectors.
Precaution for Seat Belt ServiceEHS000BE
CAUTION:

Before removing the seat belt pre-tensioner assembly, turn the ignition switch off, disconnect
both battery cables and wait at least 3 minutes.

Do not use electrical test equipment for seat belt pre-tensioner connector.

After replacing or reinstalling seat belt pre-tensioner assembly, or reconnecting seat belt pre-ten-
sioner connector, check the system function. Refer to SRS-17, "
SRS Operation Check" .

Do not use disassemble buckle or seat belt assembly.

Replace anchor bolts if they are deformed or worn out.

Never oil tongue and buckle.

If any component of seat belt assembly is questionable, do not repair. Replace the whole seat belt
assembly.

If webbing is cut, frayed, or damaged, replace seat belt assembly.

When replacing seat belt assembly, use a genuine seat belt assembly.
AFTER A COLLISION
WARNING:
Inspect all seat belt assemblies including retractors and attaching hardware after any collision.
NISSAN recommends that all seat belt assemblies in use during a collision be replaced unless the col-
lision was minor and the belts show no damage and continue to operate properly. Failure to do so
could result in serious personal injury in an accident. Seat belt assemblies not in use during a colli-
sion should also be replaced if either damage or improper operation is noted. Seat belt pre-tensioner
should be replaced even if the seat belts are not in use during a frontal collision in which the air bags
are deployed.
Replace any seat belt assembly (including anchor bolts) if:

The seat belt was in use at the time of a collision (except for minor collisions and the belts, retractors and
buckles show no damage and continue to operate properly).

The seat belt was damaged in an accident. (i.e. torn webbing, bent retractor or guide, etc.)

The seat belt attaching point was damaged in an accident. Inspect the seat belt attaching area for damage
or distortion and repair as necessary before installing a new seat belt assembly.

Anchor bolts are deformed or worn out.

The seat belt pre-tensioner should be replaced even if the seat belts are not in use during the collision in
which the air bags are deployed.

SB-6
SEAT BELT WARNING SYSTEM

SEAT BELT WARNING SYSTEMPFP:25045
Component Parts and Harness Connector LocationEHS000H6
System DescriptionEHS000GP
Power is supplied at all times,

to time control unit terminal 1

through 10A fuse [No. 28, located in fuse block (J/B)].
When ignition switch in the ON or START position,
power is supplied

to time control unit terminal 1

through 10A fuse [No. 5, located in fuse block (J/B)].

to combination meter terminal 2

through 10A fuse [No. 11, located in the fuse block (J/B)],
Ground is supplied at all times,

to time control unit terminal 16

through body ground M27 and M70.
When drive the vehicle, unified meter control unit transmits a vehicle speed signal to time control unit,

through unified meter control unit terminal 33

to time control unit terminal 36.
SEAT BELT OPERATION
( ): without power seat
Driver Side
When driver side seat belt is unfastened,
ground is supplied

to time control unit terminal 21

through seat belt buckle switch terminal 13 (1)
SHIA0329E

SEAT BELT WARNING SYSTEM
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through seat belt buckle switch terminal 14 (2)

through body ground B8 and B18.
Then time control unit recognizes the driver seat belt buckle switch signal.
Passenger Side
When passenger side belt is unfastened and occupant is sitting,
ground is supplied

to time control unit terminal 22

through seat belt buckle switch terminal 13 (1)

through seat pressure switch terminal 3

through seat pressure switch terminal 4

through body ground B107 and B119.
Then time control unit recognizes the passenger seat belt buckle switch signal.
SEAT BELT WARNING CHIME AND SEAT BELT WARNING LAMP
Driver side
When the vehicle speed exceeds 25 km/h (16 MPH) with front driver side seat belt unfastened (seat belt
switch ON), warning chime will sound for approximately 90 seconds and seat belt warning lamp is flashed.
If the seat belt are fastened, then unfastened again, warning chime will sound and seat belt warning lamp is
flashed.
Passenger side
When the vehicle speed exceeds 25 km/h (16 MPH) with front passenger side seat belt unfastened (seat belt
switch ON) and occupant is sitting (seat pressure switch is ON), warning chime will sound for approximately
90 seconds and seat belt warning lamp is flashed.
If the seat belt are fastened, then unfastened again, warning chime will sound and warning lamp is flashed.
Time Chart for Seat Belt Warning Lamp and ChimeEHS000H5
PHIA0644E

SB-8
SEAT BELT WARNING SYSTEM

SchematicEHS001FG
THWB0001E

SEAT BELT WARNING SYSTEM
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Wiring Diagram —S/WARN—/For LHD modelsEHS000GR
THWB0002E