2005 NISSAN X-TRAIL ignition

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)

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.

SEAT BELTS
SB-3
C
D
E
F
G
I
J
K
L
MA
B
SB

SEAT BELTSPFP:86884
Removal and Installation of Front Seat BeltEHS0005W
CAUTION:
Before servicing SRS, turn the ignition switch off, disconnect both battery cables and wait at least 3
minutes.
REMOVAL
1. Remove adjuster cover.
2. Remove shoulder anchor bolt.
3. Slide the floor anchor cover.
4. Remove floor anchor bolt.
5. Remove pre-tensioner seat belt retractor fixing screws to remove seat belt assembly.
6. Remove front seat. Refer to SE-26, "
Removal and Installation" .
7. Remove screw, and remove seat cushion inner finisher.
8. Remove anchor bolt to remove seat belt buckle.
INSTALLATION
CAUTION:
Before servicing SRS, turn the ignition switch off, disconnect both battery cables and wait at least 3
minutes.
Install in the reverse order of removal.
SHIA0243E
SHIA0244E

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
SB-15
C
D
E
F
G
I
J
K
L
MA
B
SB

Terminal and Reference Value for Time Control Unit EHS000H3
NOTE:
*: When seat pressure switch is ON.
TERMINALWIRE
COLORITEM CONDITION VOLTAGE (V)
1 L Battery power supply — Battery voltage
8RSeat belt warning lamp
(driver side) signalSeat belt warning lamp (driver
side) is illuminated.0
Seat belt warning lamp (driver
side) is not illuminated.Battery voltage
15 W/GSeat belt warning lamp
(passenger side) signalSeat belt warning lamp (passen-
ger side) is illuminated.0
Seat belt warning lamp (passen-
ger side) is not illuminated.Battery voltage
16 B/R Ground Turn ignition switch ON 0
17 GIgnition switch ON or
START signalTurn ignition switch ON or
STARTBattery voltage
21 BR/WSeat belt buckle switch
(driver side) signalSeat belt buckle switch (driver
side) is unfastened.0
Seat belt buckle switch (driver
side) is fastened.Battery voltage
22 G/ORSeat belt buckle switch
(passenger side) signalSeat belt buckle switch (passen-
ger side) is unfastened.*0
Seat belt buckle switch (passen-
ger side) is fastened.*Battery voltage
36LB
(A/T models)
L/Y
(M/T models)Vehicle speed signal When the vehicle speed is
approx. 40km (25MPH).
ELF1080D

SB-16
SEAT BELT WARNING SYSTEM

Work FlowEHS001FQ
1. Check the symptom and customer's requests.
2. Understand the outline of system. Refer to SB-6, "
System Description" .
3. According to the trouble diagnosis chart, repair or replace the cause of the malfunction. Refer to SB-16,
"Trouble Diagnosis Chart by Symptom" .
4. Does power seat system operate normally? If Yes, GO TO 5, If No, GO TO 3.
5. INSPECTION END.
Trouble Diagnosis Chart by SymptomEHS000GS
NOTE:
Always check the “Work Flow” before troubleshooting. Refer to SB-16, "
Work Flow" .
Time Control Unit Power Supply and Ground Circuit CheckEHS001FV
1. CHECK FUSE
Check the following.

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

Check 10A fuse [No. 28, located in the fuse block (J/B)].
OK or NG
OK >> GO TO 2.
NG >> Replace fuse.
2. CHECK POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect time control unit connector.
3. Check voltage between time control unit and ground.
OK or NG
OK >> GO TO 3.
NG >> Repair or replace time control unit power supply circuit.
Symptom Diagnoses/Service procedure Reference page
Seat belt warning system do not operate. Time control unit power supply and ground checkSB-16
Seat belt warning lamp (driver side) do not
illuminated.1. Seat belt warning lamp check (driver side)SB-172. Seat belt buckle switch checkSB-20
3. If the above system are normal, replace time control unit. —
Seat belt warning lamp (passenger side) do
not illuminated.1. Seat belt warning lamp check (passenger side)SB-19
2. Seat belt buckle switch and seat pressure switch checkSB-22
3. If the above system are normal, replace time control unit. —
Seat belt warning lamp does not illuminated
(both driver side and passenger side) Seat belt warning lamp power supply checkSB-17
Seat belt chime does not activate.(Seat belt
warning lamp is operated) Vehicle speed signal checkSB-24
ConnectorTerminals
(Wire color)
ConditionVoltage (V)
(Approx.)
(+) (–)
M30 1 (L)
GroundIgnition switch OFF Battery voltage
M31 17 (G) Ignition switch ON Battery voltage
PHIA0649E

SEAT BELT WARNING SYSTEM
SB-17
C
D
E
F
G
I
J
K
L
MA
B
SB

3. CHECK GROUND CIRCUIT
Check continuity between time control unit harness connector M30
terminal 16 (B/R) and ground.
OK or NG
OK >> Replace time control unit.
NG >> Replace harness or connector.
Seat Belt Warning Lamp Power Supply CheckEHS000GT
1. CHECK FUSE
Check 10A fuse [No.11, located in fuse block (J/B)].
Refer to PG-2, "
POWER SUPPLY ROUTING" .
OK or NG
OK >> GO TO 2.
NG >> If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse. Refer to PG-
2, "POWER SUPPLY ROUTING" .
2. CHECK POWER SUPPLY CIRCUIT
1. Disconnect combination meter connector.
2. Turn ignition switch “ON”.
3. Check voltage between combination meter connector M44 ter-
minal 2 (Y/G) and ground.
OK or NG
OK >> Replace combination meter.
NG >> Repair or replace harness between combination meter
and fuse block (J/B).
Seat Belt Warning Lamp Check (Driver side)EHS001DO
1. CHECK SEAT BELT BUCKLE SWITCH GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect combination meter connector.
3. Connect battery power supply to combination meter connector
M44 terminals 2 and 10 (LHD models) 37 (RHD models), and
check the illumination.
OK or NG
OK >> GO TO 2.
NG >> Replace combination meter.16 (B/R) - Ground : Continuity should exist.
PIIA8641E
2 (Y/G) – Ground : Battery voltage.
PHIA0641E
LHD models
2 (BAT+) – 10 (BAT-)
RHD models
2 (BAT+) – 37 (BAT-)
PHIA0642E

SEAT BELT WARNING SYSTEM
SB-19
C
D
E
F
G
I
J
K
L
MA
B
SB

Seat belt Warning Lamp Check (Passenger Side)EHS000GU
1. CHECK SEAT BELT WARNING LAMP CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect combination meter connector.
3. Connect battery power supply to combination meter connector
M44 terminals 2 and 37 (LHD models) 10 (RHD models), and
check the illumination.
OK or NG
OK >> GO TO 2.
NG >> Replace combination meter.
2. CHECK SEAT BELT WARNING LAMP CIRCUIT HARNESS CONTINUITY
1. Disconnect time control unit connector.
2. Check the following.
LHD models
–Check continuity between combination meter connector M44
terminal 37 (W/G) and time control unit connector M30 terminal
15 (W/G).
–Check continuity between combination meter connector M44
terminal 37 (W/G) and ground.
RHD models
–Check continuity between combination meter connector M44 terminal 10 (W/G) and time control unit con-
nector M30 terminal 15 (W/G).
–Check continuity between combination meter connector M44 terminal 10 (W/G) and ground.
OK or NG
OK >> Seat belt warning lamp (Passenger side) is OK.
NG >> Repair or replace harness between combination meter and time control unit.LHD models
2 (BAT+) – 37 (BAT-)
RHD models
2 (BAT+) – 10 (BAT-)
PHIA0642E
37 (W/G) – 15 (W/G) : Continuity should exist.
37 (W/G) – Ground : Continuity should not exist.
10 (W/G) – 15 (W/G) : Continuity should exist.
10 (W/G) – Ground : Continuity should not exist.
PHIA0643E