NISSAN X-TRAIL 2005 Service Repair Manual

SEAT BELT WARNING SYSTEM
SB-13
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THWB0006E

SB-14
SEAT BELT WARNING SYSTEM

THWB0007E

SEAT BELT WARNING SYSTEM
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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
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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

SB-18
SEAT BELT WARNING SYSTEM

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 10 (R) and time control unit connector M30 terminal 8
(R).
–Check continuity between combination meter connector M44
terminal 10 (R) and ground.
RHD models
–Check continuity between combination meter connector M44 terminal 37 (R) and time control unit connec-
tor M30 terminal 8 (R).
–Check continuity between combination meter connector M44 terminal 37 (R) and ground.
OK or NG
OK >> Seat belt warning lamp (Driver side) is OK.
NG >> Repair or replace harness between combination meter and time control unit.10 (R) – 8 (R) : Continuity should exist.
10 (R) – Ground : Continuity should not exist.
37 (R) – 8 (R) : Continuity should exist.
37 (R) – Ground : Continuity should not exist.
PHIA0648E

SEAT BELT WARNING SYSTEM
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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

SB-20
SEAT BELT WARNING SYSTEM

Seat Belt Buckle Switch CheckEHS000GW
1. CHECK SEAT BELT BUCKLE SWITCH (DRIVER SIDE) INPUT SIGNAL
1. Turn ignition switch “ON”.
2. Check voltage between time control unit connector M31 terminal
21 (BR/W) and ground.
OK or NG
OK >> Seat belt buckle switch (driver side) is OK.
NG >> GO TO 2.
2. CHECK SEAT BELT BUCKLE SWITCH HARNESS CONTINUITY
1. Turn ignition switch “OFF”.
2. Disconnect time control unit connector and seat belt buckle
switch (driver side) connector.
3. Check the following.
with power seat
–Check continuity between time control unit connector M31 termi-
nal 21 (BR/W) and seat belt buckle switch (driver side) connec-
tor B302 terminal 13 (R).
–Check continuity between time control unit connector M31 termi-
nal 21 (BR/W) and ground.
without power seat
–Check continuity between time control unit connector M31 termi-
nal 21 (BR/W) and seat belt buckle switch (driver side) connec-
tor B10 terminal 1 ( * ).
–Check continuity between time control unit connector M31 termi-
nal 21 (BR/W) and ground.
NOTE:
* :

OK or NG
OK >> GO TO 3.
NG >> Repair or replace harness between time control unit and seat belt buckle switch.
Terminal (Wire color)
ConditionVoltage (V)
(Approx.)
(+) (–)
21 (BR/W) GroundDriver side seat belt buckle switch
FastenBattery voltage
Driver side seat belt buckle switch
Unfasten0
PHIA0632E
21 (BR/W) – 13 (R) : Continuity should exist.
21 (BR/W) – Ground : Continuity should not exist.
21 (BR/W) – 1 ( * ) : Continuity should exist.
21 (BR/W) – Ground : Continuity should not exist.
LHD models :BR/W
RHD models :W/B
PHIA0633E

SEAT BELT WARNING SYSTEM
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3. CHECK SEAT BELT BUCKLE SWITCH (DRIVER SIDE)
Check continuity between seat belt buckle switch (driver side) termi-
nals 13 (1) and 14 (2).
( ): without power seat
OK or NG
OK >> GO TO 4.
NG >> Replace seat belt buckle switch (driver side).
4. CHECK SEAT BELT BUCKLE SWITCH GROUND CIRCUIT
1. Check the following.
with power seat
–Check harness continuity between seat belt buckle switch
(driver side) connector B302 terminal 14 (OR) and ground.
without power seat
–Check harness continuity between seat belt buckle switch
(driver side) connector B10 terminal 2 (B) and ground.
OK or NG
OK >> Check the condition of the harness and connector.
NG >> Repair or replace harness between seat belt buckle
switch and ground.
Terminal Condition Continuity
13 (1) 14 (2)Driver side seat belt buckle switch
Fasten No
Driver side seat belt buckle switch
UnfastenYe s
PHIA0634E
14 (OR) – Ground : Continuity should exist.
2 (B) – Ground : Continuity should exist.
PHIA0629E

SB-22
SEAT BELT WARNING SYSTEM

Seat Belt Buckle Switch and Seat Pressure Switch CheckEHS000GX
1. CHECK TIME CONTROL UNIT INPUT SIGNAL
1. Turn ignition switch “ON”.
2. Check voltage between time control unit connector M31 terminal
22 (G/OR) and ground.
NOTE:
When performing the following procedure, a person is sitting on the
passenger side seat. (As a result, the seat pressure sensor is turned
ON.)
OK or NG
OK >> Seat belt buckle switch (passenger side) is OK.
NG >> GO TO 2.
2. CHECK SEAT BELT BACKLE SWITCH CIRCUIT HARNESS CONTINUITY
1. Turn ignition switch “OFF”.
2. Disconnect time control unit connector and seat belt buckle
switch (passenger side) connector.
3. Check the following.
with power seat
–Check continuity between time control unit connector M31 termi-
nal 22 (G/OR) and seat belt buckle switch (passenger side) con-
nector B352 terminal 13 (R).
–Check continuity between time control unit connector M31 termi-
nal 22 (G/OR) and ground.
without power seat
–Check continuity between time control unit connector M31 termi-
nal 22 (G/OR) and seat belt buckle switch (passenger side) con-
nector B113 terminal 1 (G/OR).
–Check continuity between time control unit connector M31 termi-
nal 22 (G/OR) and ground.
OK or NG
OK >> GO TO 3.
NG >> Repair or replace harness between time control unit and seat belt buckle switch.
Terminal
(wire color)
Condition Voltage (V)
(+) (–)
22 (G/OR) GroundPassenger side seat belt buckle
switch Fasten and seat pressure
switch ON.Battery voltage
Passenger side seat belt buckle
switch Unfasten and seat pres-
sure switch OFF.0
PHIA0630E
22 (G/OR) – 13 (R) : Continuity should exist.
22 (G/OR) – Ground : Continuity should not exist.
22 (G/OR) – 1 (G/OR) : Continuity should exist.
22 (G/OR) – Ground : Continuity should not exist.
PHIA0631E