2000 NISSAN PATROL sensor

Supplemental Restraint System (SRS) ªAIR
BAGº and ªSEAT BELT PRE-TENSIONERº
The Supplemental Restraint System such as ªAIR BAGº and ªSEAT BELT PRE-TENSIONERº used along
with a seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. The SRS system composition which is available to NISSAN MODEL Y61 is as follows (The
composition varies according to the destination and optional equipment.):
+For a frontal collision
The Supplemental Restraint System consists of driver air bag module (located in the center of the
steering wheel), front passenger air bag module (located on the instrument panel on passenger side),
seat belt pre-tensioners, a diagnosis sensor unit, warning lamp, wiring harness and spiral cable.
+For a side collision
The Supplemental Restraint System consists of front side air bag module (located in the outer side of
front seat), satellite sensor, diagnosis sensor unit (one of components of air bags for a frontal collision),
wiring harness, warning lamp (one of components of air bags for a frontal collision).
Information necessary to service the system safely is included in theRS sectionof 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 should be per-
formed by an authorized NISSAN 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 RS section.
+Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. Spiral cable and wiring harnesses covered with yellow insulation tape either just
before the harness connectors or for the complete harness are related to the SRS.
PRECAUTIONS AND PREPARATION
EL-1003

System Description
POWER SUPPLY AND GROUND
Power is supplied at all times:
+through 10A fuse [No.
20, located in the fuse block (J/B)]
+to front and rear interior room lamp terminal
V1
+through 7.5A fuse [No.24, located in the fuse block (J/B)]
+to key switch terminal
V2and
+to super lock control unit terminal
V1.
When the key is removed from ignition key cylinder, power is interrupted:
+through key switch terminal
V1
+to super lock control unit terminalV18.
With the ignition key switch in the ON or START position, power is supplied:
+through 10A fuse [No.
25, located in the fuse block (J/B)]
+to super lock control unit terminal
V17.
Ground is supplied:
+to super lock control unit terminal
V16
+through body grounds terminalsM30andM19(LHD models) orM98(RHD models).
When the front driver side door is opened, ground is supplied:
+through body grounds
B23andM19(LHD models) orM98(RHD models).
+to front door switch (driver side) terminal
V3
+from front door switch (driver side) terminalV1
+to super lock control unit terminalV30.
When any other door is opened, ground is supplied to super lock control unit terminal
V31in the same man-
ner as the driver door switch.
When the front driver side door is unlocked, the super lock control unit receives a ground signal:
+through body grounds terminals
M30andM19(LHD models) orM98(RHD models).
+to front door lock actuator (driver side) (door unlock sensor) terminal
V5
+from front door lock actuator (driver side) (door unlock sensor) terminalV2
+to super lock control unit terminalV28.
When a signal, or combination of signals is received by the super lock control unit, ground is supplied:
+through super lock control unit terminal
V26
+to front interior room lamp terminalV2.
With power and ground supplied, the front interior room lamp illuminates.
INTERIOR ROOM LAMP TIMER OPERATION
When front interior room lamp switch is in the ªDOORº position, the super lock control unit keeps the front
interior room lamp illuminated for about 30 seconds when:
+unlock signal is supplied from driver's door unlock sensor while all doors are closed and key is out of
ignition key cylinder
+key is removed from ignition key cylinder while all doors are closed
+driver's door is opened and then closed while key is out of the ignition key cylinder. (However, if the
driver's door is closed with the key inserted in the ignition key cylinder after the driver's door is opened
with the key removed, the timer is operated.)
The timer is canceled when:
+driver's door is locked or
+ignition switch is turned ON.
ON-OFF CONTROL
When the driver side door, front passenger door, rear LH or RH door, back door LH or RH is opened, the
interior room lamp turns on while the interior room lamp switch is in the ªDOORº position.
INTERIOR ROOM LAMP
EL-1067

System Description
The warning chime is combined with the super lock control unit.
Both the ignition key and light warning chime will not sound, when ignition switch in the ON or START posi-
tion (when power supply exists at super lock control unit terminal
V17).
IGNITION KEY WARNING CHIME
With the key in the ignition key cylinder, the ignition switch in the OFF or ACC position, and the driver's door
open and locked, the warning chime will sound. Power is supplied
+from key switch terminal
V1
+to super lock control unit terminalV18.
Ground is supplied
+through driver front door switch terminal
V1
+to super lock control unit terminalV30, and
+through front door lock actuator assembly (driver side) (unlock sensor) terminal
V2
+to super lock control unit terminalV28.
LIGHT WARNING CHIME
With ignition switch in the OFF or ACC position, driver's door open, and lighting switch in 1ST or 2ND
position, warning chime will sound. Power is supplied
+from combination switch terminal
V12
+to super lock control unit terminalV19.
Ground is supplied
+through driver front door switch terminal
V1
+to super lock control unit terminalV30.
WARNING CHIME
EL-1091

Trouble Diagnoses
SYMPTOM CHART
REFERENCE PAGE EL-1094 EL-1095 EL-1095 EL-1096
SYMPTOM
DIAGNOSTIC PROCEDURE 1
(Lighting switch input signal check)
DIAGNOSTIC PROCEDURE 2
(Key switch input signal check)
DIAGNOSTIC PROCEDURE 3
(Door unlock sensor check)
DIAGNOSTIC PROCEDURE 4
Light warning chime does not acti-
vate.XX
Ignition key warning chime does not
activate.XXX
All warning chimes do not activate.X
DIAGNOSTIC PROCEDURE 1
(Lighting switch input signal check)
CHECK LIGHTING SWITCH INPUT SIG-
NAL.
Check voltage between super lock control
unit terminal
V19and ground.
OK
cNG
Check the following.
+Harness for open or
short between super
lock control unit and
combination switch
(RHD models)
+Harness for open or
short between super
lock control unit and
7.5A fuse (LHD models)
Go to DIAGNOSTIC PROCEDURE 4.
Condition of lighting
switchVoltage [V]
1ST or 2ND Approx. 12
OFF 0
SEL122X
.
WARNING CHIME
EL-1094

DIAGNOSTIC PROCEDURE 2
(Key switch input signal check)
CHECK KEY SWITCH INPUT SIGNAL.
Check voltage between super lock control
unit terminal
V18and ground.
OK
cNG
Check the following.
+Key switch
Refer to ªElectrical Com-
ponents Inspectionº (EL-
1097).
+7.5A fuse [No.
24,
located in fuse block
(J/B)]
+Harness for open or
short between key
switch and fuse
+Harness for open or
short between super
lock control unit and key
switch
Go to DIAGNOSTIC PROCEDURE 4.
Condition of key switch Voltage [V]
Key is inserted. Approx. 12
Key is withdrawn. 0
DIAGNOSTIC PROCEDURE 3
(Door unlock sensor check)
CHECK DOOR UNLOCK SENSOR
INPUT SIGNAL.
Check voltage between super lock control
unit terminal
V28and ground.
OK
cNG
Check the following.
+Door unlock sensor
Refer to ªElectrical Com-
ponents Inspectionº (EL-
1097).
+Harness for open or
short between super
lock control unit and
door unlock sensor
Go to DIAGNOSTIC PROCEDURE 4.
Terminals
ConditionVoltage
[V]
Å@
V28GroundLocked Approx. 5
Unlocked 0
SEL123X
SEL175X
.
.
WARNING CHIME
Trouble Diagnoses (Cont'd)
EL-1095

Electrical Components Inspection
KEY SWITCH (insert)
Check continuity between terminals when key is inserted in igni-
tion key cylinder and key is removed from ignition key cylinder.
Terminal No. Condition Continuity
V1-V2Key is inserted. Yes
Key is removed. No
DRIVER SIDE DOOR SWITCH
Check continuity between terminals when door switch is pushed
and released.
Terminal No. Condition Continuity
V1-V3Door switch is pushed. No
Door switch is released. Yes
DRIVER SIDE DOOR UNLOCK SENSOR
Check continuity between door unlock sensor terminals with the
door locked and unlocked.
Terminal No. Condition Continuity
V2-V5Locked No
Unlocked Yes
SEL015WB
SEL039X
SEL814UD
WARNING CHIME
EL-1097

Key reminder system
+If the ignition key is in the ignition key cylinder and the driver door is open, setting lock knob on driver door,
key or multi-remote controller to ªLOCKº locks the door once but then immediately unlocks all doors. (Sig-
nal from unlock sensor driver side)
System initialization
+System initialization is required when battery cables are reconnected. Conduct one of the followings to
release super lock once;
Ð insert the key into ignition key cylinder and turn it to ON.
Ð LOCK/UNLOCK operation using door key cylinder or multi-remote controller.
POWER DOOR LOCK Ð Super Lock Ð
System Description (Cont'd)
EL-1126

Before starting trouble diagnoses below, perform preliminary check, EL-1138.
Symptom numbers in the symptom chart correspond with those of Preliminary check.
SYMPTOM CHART
REFERENCE PAGE EL-1140 EL-1141 EL-1142 EL-1143 EL-1144 EL-1145 EL-1146 EL-1147 EL-1148 EL-1148
SYMPTOM
Power supply and ground circuit check
Procedure 1
(Door unlock sensor check)
Procedure 2
(Door key cylinder switch check)
Procedure 3
(Door lock and unlock switch check)
Procedure 4
(Door lock actuator check)
Procedure 5
(Super lock actuator check)
Procedure 6
(Driver's door switch check)
Procedure 7
(NATS release signal check)
Procedure 8
(Key switch check)
Procedure 9
(Ignition switch ªONº circuit check)
1Power door lock does not operate
using any switch.XX
2Power door lock does not operate
with both door key cylinders.X
3Power door lock does not operate
with door lock and unlock switch.X
4Specific door lock actuator does
not operate.X
5Super lock cannot be set by both
door key cylinders.XXXXX
6Super lock cannot be set by one of
door key cylinders.X
7*Super lock cannot be released by
one or both door key cylinders.X
8*Super lock cannot be released by
ignition key switch. (Signal from
NATS IMMU and ignition switch)XXX
9Specific super lock actuator does
not operate.X
10*Key reminder system does not
operate.XXX
X: Applicable
*: Make sure the power door lock system operates properly.
POWER DOOR LOCK Ð Super Lock Ð
Trouble Diagnoses (Cont'd)
EL-1139