sensor NISSAN PRIMERA 1999 Electronic Repair Manual

RESTRAINT SYSTEM
SECTION
RS
CONTENTS
PRECAUTION................................................................ 2
Supplemental Restraint System (SRS)²AIR
BAG²and²SEAT BELT PRE-TENSIONER²............. 2
SEAT BELT.................................................................... 3
Front Seat Belt........................................................... 3
Rear Seat Belt (4-door models) ................................ 4
Rear Seat Belt (Wagon and 5-door models)............. 6
SUPPLEMENTAL RESTRAINT SYSTEM (SRS).......... 8
Precautions for SRS²AIR BAG²and²SEAT
BELT PRE-TENSIONER²Service ............................. 8
Special Service Tools ................................................ 8
Description ............................................................... 10
SRS Component Parts Location .............................. 11
Maintenance Items .................................................. 12
Removal and Installation - Diagnosis Sensor
Unit, Seat Belt Pre-tensioner and Satellite
Sensor...................................................................... 13
Removal - Air Bag Module and Spiral Cable .......... 14
Installation - Air Bag Module and Spiral Cable ....... 16Removal - Front Passenger's Air Bag Module ........ 17
Installation - Front Passenger's Air Bag Module ..... 18
Removal - Side Air Bag Module .............................. 19
Installation - Side Air Bag Module ........................... 20
Disposal of Air Bag Module and Seat Belt Pre-
tensioner .................................................................. 22
TROUBLE DIAGNOSES - SUPPLEMENTAL
RESTRAINT SYSTEM (SRS)...................................... 28
Trouble Diagnoses Introduction............................... 28
How to Perform Trouble Diagnoses for Quick
and Accurate Repair ................................................ 30
Schematic ................................................................ 32
Wiring Diagram - SRS -........................................... 33
SRS-Operation Check ............................................. 37
Trouble Diagnoses with CONSULT-II................. 38
Trouble Diagnoses without CONSULT-II............ 48
Trouble Diagnoses for Air Bag Warning Lamp........ 56
COLLISION DIAGNOSIS............................................. 57
When you read wiring diagrams:
lRead GI section, ªHOW TO READ WIRING DIAGRAMSº.
lSee EL section, ªPOWER SUPPLY ROUTINGº for power distribution circuit.
lSee EL section for NATS information and wiring diagram.
When you perform trouble diagnoses, read GI section, ªHOW TO FOLLOW FLOW
CHART IN TROUBLE DIAGNOSESº and ªHOW TO PERFORM EFFICIENT DIAGNOSIS
FOR AN ELECTRICAL INCIDENTº.
RS

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, help to reduce the risk or severity of injury to the driver and front passenger in certain types
of collision. The SRS system composition which is available to NISSAN MODEL P11 is as follows (The
composition varies according to the destination and optional equipment):
lFor a frontal collision
The Supplemental Restraint System consists of driver's air bag module (located in the center of the
steering wheel), front passenger's air bag module (located on the instrument panel on passenger's side),
seat belt pre-tensioners, a diagnosis sensor unit, warning lamp, wiring harness and spiral cable.
lFor a side collision
The Supplemental Restraint System consists of air bag modules (located in the outer side of front seats),
satellite sensor, diagnosis sensor unit (one of components of supplemental air bags for a frontal collision),
wiring harness, warning lamp (one of components of supplemental air bags for a frontal collision).
WARNING:
lTo 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 dealer.
lImproper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system.
lDo not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. Spiral cable and SRS wiring harnesses except ªSEAT BELT PRE-TENSIONERº
connectors can be identified by yellow harness connector (and with yellow harness protector or
yellow insulation tape before the harness connectors).
CAUTION:
lBefore removing the seat belt pre-tensioner assembly, turn the ignition switch OFF, disconnect
both battery cables and wait at least 3 minutes.
lDo not use electrical test equipment for seat belt pre-tensioner connector.
lAfter replacing or installing seat belt pre-tensioner assembly, or reconnecting seat belt pre-ten-
sioner connector, check the system function. Refer to ªSRS Operation Checkº (RS-37) for details.
lDo not disassemble buckle or seat belt assembly.
lReplace anchor bolts if they are deformed or worn out.
lNever oil tongue and buckle.
lIf any component of seat belt assembly is questionable, do not repair. Replace the whole seat
belt assembly.
lIf webbing is cut, frayed, or damaged, replace seat belt assembly.
lWhen replacing seat belt assembly, use a genuine seat belt assembly.
lAfter any collision, inspect all seat belt assemblies, including retractors and other attached
hardwares (i.e., guide rail set).
PRECAUTION
RS-2

Precautions for SRS ªAIR BAGº and ªSEAT
BELT PRE-TENSIONERº Service
lDo not use electrical test equipment to check the SRS unless instructed to do in this Service Manual.
lBefore servicing the SRS, turn ignition switch ªOFFº, disconnect both battery cables and wait at least 3
minutes.
For approximately 3 minutes after the cables are removed, it is still possible for the air bag and seat belt
pre-tensioner to deploy. Therefore, do not work on any SRS connectors or wires until at least 3 minutes
have passed.
lDiagnosis sensor unit must always be installed with their arrow marks ªSº pointing towards the front of
the vehicle for proper operation. Also check diagnosis sensor unit for cracks, deformities or rust before
installation and replace as required.
lThe spiral cable must be aligned with the neutral position since its rotations are limited. Do not attempt
to turn steering wheel or column after removal of steering gear.
lHandle air bag module carefully. Always place driver's and passenger's air bag modules with the pad
side facing upward and place side air bag module (built-in type) standing with stud bolt side setting bot-
tom.
lConduct self-diagnosis to check entire SRS for proper function after replacing any components.
lAfter air bag inflates, the front instrument panel assembly should be replaced if damaged.
Special Service Tools
Tool number
Tool nameDescription
KV99106400
Deployment tool
NT357
Disposing of air bag module
KV99105300
Air bag module bracket
NRS016
Anchoring air bag module
HT61961000 and
HT62152000 combined
*Special torx bit
NT361
Use for special bolts
[TAMPER RESISTANT TORX (Size T50)]
a: 3.5 (0.138) dia.
b: 8.5 - 8.6 (0.335 - 0.339) dia.
c: approx. 10 (0.39) sq.
Unit: mm (in)
Tamper resistant torx
socket
NT757
Size: T30
*: Special tool or commercial equivalent
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
RS-8

Description
The air bag deploys if the diagnosis sensor unit activates while the ignition switch is in ªONº or ªSTARTº
position.
The collision modes for which supplemental restraint systems are activated are different among the SRS
systems. For example, the driver's air bag module and passenger's air bag module are activated in a fron-
tal collision but not in a side collision.
SRS configurations which are activated for some collision modes are as follows;
SRS configuration Frontal collision Left side collision Right side collision
Driver's air bag moduleqÐÐ
Passenger's air bag moduleqÐÐ
Seat belt pre-tensioner (Driver's side)qÐÐ
Seat belt pre-tensioner (Passenger's side)qÐÐ
Side air bag module (LH) ÐqÐ
Side air bag module (RH) Ð Ðq
SRS585 Seat belt pre-tensioner
(Driver's side)
Satellite sensor (LH)
(G sensor for side
air bag LH)Diagnosis sensor unit
lAuxiliary power source (condenser)
lDrive circuit
lCPU
lG sensor
(for driver's and passenger's air bags,
seat belt pre-tensioner)
lSafing sensor
(for driver's and passenger's air bags,
seat belt pre-tensioner)
lSafing sensor
(for side air bag) Side air bag module (LH)
(Built-in type)Side air bag module
(RH) (Built-in type) Satellite sensor (RH)
(G sensor for side air bag
RH) Driver's air bag
modulePassenger's air bag
module
Seat belt pre-tensioner
(passenger's side)
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
RS-10

Built-in Type Side Air Bag
Front side air bag is built-in type.
The front seat back with built-in type side air bag has the labels
as shown on the left figure.
SRS Component Parts Location
NRS059
.Front seat back with front side air bag
(Built-in type)
NRS125 Passenger's air bag module
Driver's air bag module
Satellite sensors Spiral cable
Wiring harness
.Seat belt preten-
sioner retractors
.Diagnosis
sensor unit
.Side air bag modules
(Built-in type)
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
RS-11

Maintenance Items
CAUTION:
Do not use electrical test equipment to check SRS circuit.
1. Check operation of ªAIR BAGº warning lamp.
After turning ignition key to ªONº position, the ªAIR BAGº
warning lamp illuminates. The ªAIR BAGº warning lamp will
go off after about 7 seconds if no malfunction is detected.
If any of the following warning lamp conditions occur, imme-
diately check the air bag system. Refer to ªSRS-Operation
Checkº for details. (RS-37)
lThe ªAIR BAGº warning lamp does not come on when the
ignition switch is turned ªONº.
lThe ªAIR BAGº warning lamp does not go off about 7 sec-
onds after the ignition switch is turned ªONº.
lThe ªAIR BAGº warning lamp blinks about 7 seconds after
the ignition switch is turned ªONº.
2. Visually check SRS components.
(1) Diagnosis sensor unit
lCheck diagnosis sensor unit and bracket for dents, cracks or
deformities.
lCheck connectors for damage, and terminals for deformities.
(2) Air bag module and steering wheel
lRemove air bag module from steering wheel, instrument
panel or seat back. Check harness cover and connectors for
damage, terminals for deformities, and harness for binding.
lInstall driver's air bag module to steering wheel to check fit
or alignment with the wheel.
lCheck steering wheel for excessive free play.
lInstall passenger's air bag module to instrument panel to
check fit or alignment with the instrument panel.
lInstall side air bag module to seatback to check fit and align-
ment with the seat.
(3) Spiral cable
lCheck spiral cable for dents, cracks, or deformities.
lCheck connectors and protective tape for damage.
lCheck steering wheel for noise, binding or heavy operation.
(4) Main harness, body harness and air bag harness
lCheck connectors for poor connections, damage, and termi-
nals for deformities.
lCheck harnesses for binding, chafing or cuts.
(5) Seat belt pre-tensioner
lCheck harness cover and connectors for damage, terminals
for deformities, and harness for binding.
lCheck belts for damage and anchors for loose mounting.
lCheck retractor for smooth operation.
lPerform self-diagnosis for seat belt pre-tensioner using ªAIR
BAGº warning lamp or CONSULT-II. Refer to ªSRS Operation
Checkº for details. (RS-37)
(6) Side airbag (Satellite) sensor
lCheck Side airbag (Satellite) sensor (including bracket por-
tion) for dents, cracks or deformities.
lCheck connectors for damage, and terminals for deformities.
SRS797-A
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
RS-12

CAUTION:
Replace previously used special bolts, ground bolt and nuts
coated with bonding agent and also the anchor bolt with
new ones.
Removal and Installation Ð Diagnosis
Sensor Unit, Seat Belt Pre-tensioner and
Satellite Sensor
CAUTION:
lBefore servicing SRS, turn the ignition switch ªOFFº, disconnect both battery cables and wait at
least 3 minutes.
lThe special bolts are coated with bonding agent while the other bolt is for ground. Do not use
old bolts after removal; replace with new ones.
lCheck diagnosis sensor unit, seat belt pre-tensioner and satellite sensor for proper installation.
lCheck diagnosis sensor unit and satellite sensor to ensure they are free of deformities, dents,
cracks or rust. If it shows any visible signs of damage, replace them with new ones.
lCheck diagnosis sensor unit brackets to ensure they are free of deformities and rust.
lAfter replacement of diagnosis sensor unit, seat belt pre-tensioner and satellite sensor check
SRS function and perform self-diagnosis for SRS. Refer to ªSRS Operation Checkº for details.
(RS-37)
lDo not attempt to disassemble diagosis sensor unit,seat belt pre-tensioner and satellite sensor
lReplace diagnosis sensor unit, seat belt pre-tensioner and satellite sensor if it has been dropped
or sustained an impact.
lDo not expose seat belt pre-tensioner to temperatures exceeding 80ÉC (176ÉF).
REMOVAL OF DIAGNOSIS SENSOR UNIT
1. Disconnect driver's, passenger's- and side air bag module
connectors. Also, disconnect seat belt pre-tensioner connec-
tor.
2. Remove lower instrument center panel. Refer to ªINSTRU-
MENT PANELº in BT section.
3. Disconnect diagnosis sensor unit connector.
4. Remove ground bolt and the special bolts by using the
TAMPER RESISTANT TORX (Size T50), from diagnosis sen-
sor unit.
Then remove the diagnosis sensor unit.
NOTE:
lTo install, reverse the removal procedure sequence.
lDiagnosis sensor unit must always be installed with
their arrow marks ª
Sº pointing towards the front of the
vehicle for proper installation.
REMOVAL OF SEAT BELT PRE-TENSIONER
For removal of seat belt pre-tensioner, refer to ªFront Seat Beltº
for details. (RS-3)
NOTE:
lTo install, reverse the removal procedure sequence.
NRS061
Diagnosis sensor unit
.Forward mark
Ground
bolt
FRONTSpecial bolt15-25N´m
(1.5 - 2.5 kg-m, 11 - 18 ft-lb)
NRS062
.5.1 - 6.3 N´m
(0.52 - 0.64 kg-m,
45 - 56 in-lb)
.Seat belt
pre-tensioner
.Connector.Anchor bolt43-55N´m
(4.4 - 5.6 kg-m,
32 - 41 ft-lb)
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
RS-13

REMOVAL SATELLITE SENSOR
1. Remove seat belt pre-tensioner. Refer to ªFront Seat Beltº for
details. (RS-3)
2. Disconnect satellite sensor connector.
3. Remove bolt and nuts from satellite sensor unit. Then
remove the satellite sensor.
NOTE:
lTo install, reverse the removal procedure sequence.
Removal Ð Air Bag Module and Spiral Cable
NRS126
7-13
(0.8 - 1.3,
62 - 115)
14.5 - 24.5
(1.5 - 2.5,
11 - 18)
.Ground bolt2.94 - 4.9
(0.30 - 0.50,
26 - 43)
: N´m (kg-m, ft-lb)
: N´m (kg-m, in-lb)Connector
NRS123 Side lid RH
(where fitted) Audio steering switch
(where fitted)
Side lid RH
29-39N´m
(3.0 - 4.0 kg-m, 22 - 29 ft-lb) Spiral
cable
Combination switch
Side lid LHSpecial bolt
7.8 - 13.7 N´m (0.8 - 1.4 kg-m, 69 - 121 in-lb)Lower lid
SEC. 253×484
Air bag module Special bolt
7.8 - 13.7 N´m (0.8 - 1.4 kg-m, 69 - 121 in-lb)
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
Removal and Installation Ð Diagnosis
Sensor Unit, Seat Belt Pre-tensioner and
Satellite Sensor (Cont'd)
RS-14

Trouble Diagnoses Introduction
CAUTION:
lDo not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. Spiral cable and SRS wiring harnesses (except ªSEAT BELT PRE-TENSIONER
CONNECTORº) can be identified by yellow harness connector (and with yellow harness protec-
tor or yellow insulation tape before the harness connectors.
lDo not attempt to repair, splice or modify the SRS wiring harness. If the harness is damaged,
replace it with a new one.
lKeep ground portion clean.
DIAGNOSIS FUNCTION
The SRS self-diagnosis results can be read by using ªAIR BAGº warning lamp and/or CONSULT-II. The
reading of these results is accomplished using one of two modes Ð ªUser modeº and ªDiagnosis modeº.
The User mode is exclusively prepared for the customer (driver). This mode warns the driver of a system
malfunction through the operation of the ªAIR BAGº warning lamp.
The Diagnosis mode allows the technician to locate and inspect the malfunctioning part.
The mode applications for the ªAIR BAGº warning lamp and CONSULT-II are as follows:
User mode Diagnosis mode Display type
ªAIR BAGº warning lamp X XON-OFF operation
CONSULT-II Ð XMonitoring
lSeat belt pre-tensioner system can only be diagnosed by CONSULT-II.
DIAGNOSIS MODE FOR CONSULT-II
lSELF-DIAG [CURRENT]
A current Self-diagnosis result (also indicated by the number of warning lamp flashes in the Diagnosis
mode) is displayed on the CONSULT-II screen in real time. This refers to a malfunctioning part requir-
ing repairs.
lSELF-DIAG [PAST]
Diagnosis results previously stored in the memory (also indicated by the warning lamp flashes in the
Diagnosis mode) are displayed on the CONSULT-II screen. The stored results are not erased until
memory erasing is executed.
lTROUBLE DIAG RECORD
With TROUBLE DIAG RECORD, diagnosis results previously erased by a reset operation can be dis-
played on the CONSULT-II screen.
lªECU DISCRIMINATED NO.º
The diagnosis sensor unit for each vehicle model is assigned with its own, individual classification num-
ber (refer to the table below). This number will be displayed on the CONSULT-II screen. When replac-
ing the diagnosis sensor unit, refer to the part number for the compatibility. After installation, replace-
ment with a correct unit can be checked by confirming this classification number on the CONSULT-II
screen.
For NISSAN MODEL P11, the diagnosis sensor unit classification numbers are as follows:
MODEL ECU DISCRIMINATED NO.
Models with single air bag and seat belt pre-tensioner A914
Models with dual air bags and seat belt pre-tensioner A915
Models with dual air bags, side air bag and seat belt pre-tensioner A916
TROUBLE DIAGNOSES Ð Supplemental Restraint System (SRS)
RS-28

YRS049
DIAGNOSIS
SENSOR UNIT
SPIRAL
CABLE
AIR BAG MODULE
(DRIVER'S SIDE)AIR BAG MODULE
(PASSENGER'S SIDE)
: With dual air bag
: This connector is not shown in ªHARNESS LAYOUTº of EL section.
TROUBLE DIAGNOSES Ð Supplemental Restraint System (SRS)
Wiring Diagram Ð SRS Ð (Cont'd)
RS-34