1998 NISSAN PICK-UP sensor

RESTRAINT SYSTEM
SECTION
RS
CONTENTS
PRECAUTION............................................................ 1
Supplemental Restraint System (SRS) ``AIR
BAG'' (4WD models).............................................. 1
Supplemental Restraint System (SRS) ``AIR
BAG'' (2WD models).............................................. 1
SEAT BELTS............................................................. 2
Front Seat Belt ....................................................... 3
Rear Seat Belt ....................................................... 4
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)..... 6
Precautions for SRS ``AIR BAG'' Service .............. 6
Special Service Tools ............................................ 6
Description ............................................................. 7
SRS Component Parts Location............................ 8
Maintenance Items................................................. 9
Removal and Installation - Diagnosis Sensor
Unit (4WD models) .............................................. 10
Removal and Installation - Air Bag Module and
Spiral Cable (4WD models) ................................. 11
Removal and Installation - Air Bag Module and
Spiral Cable (2WD models) ................................. 11
Removal - Air Bag Module and Spiral Cable ...... 12
Installation - Air Bag Module and Spiral Cable ... 13
Disposal of Air Bag Module ................................. 14TROUBLE DIAGNOSES - Supplemental
Restraint System (SRS) - 2WD models................ 17
How to Perform Trouble Diagnoses for Quick
and Accurate Repair ............................................ 17
Wiring Diagram - SRS - ....................................... 18
Self-diagnosis....................................................... 19
COLLISION DIAGNOSIS - 2WD models............... 21
TROUBLE DIAGNOSES - Supplemental
Restraint System (SRS) -....................................... 22
Trouble Diagnoses Introduction ........................... 22
How to Perform Trouble Diagnoses for Quick
and Accurate Repair ............................................ 24
Wiring Diagram - SRS - ....................................... 26
SRS Operation Check ......................................... 28
Trouble Diagnoses with CONSULT ..................... 29
Trouble Diagnoses without CONSULT ................ 37
Trouble Diagnoses: Air Bag Warning Lamp
Does Not Turn OFF ............................................. 40
Trouble Diagnoses: Air Bag Warning Lamp
Does Not Turn ON ............................................... 41
Trouble Diagnoses: SRS Does Not Enter
Diagnosis Mode Using Door Switch .................... 41
COLLISION DIAGNOSIS - 4WD models............... 42
When you read wiring diagrams:
lRead GI section, ``HOW TO READ WIRING DIAGRAMS''.
lSee EL section, ``POWER SUPPLY ROUTING'' for power distribution circuit.
When you perform trouble diagnoses, read GI section, ``HOW TO FOLLOW FLOW CHART
IN TROUBLE DIAGNOSES'' and ``HOW TO PERFORM EFFICIENT DIAGNOSIS FOR AN
ELECTRICAL INCIDENT''.
RS

Supplemental Restraint System (SRS) ``AIR
BAG'' (4WD models)
The Supplemental Restraint System ``AIR BAG'', used along with a seat belt, helps to reduce the risk or
severity of injury to the driver in a frontal collision. The Supplemental Restraint System consists of air bag
module (located in the center of the steering wheel), diagnosis sensor unit, warning lamp, wiring harness
and spiral cable.
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. SRS wiring harnesses are covered with yellow insulation either just before the
harness connectors or for the complete harness, for easy identification.
Supplemental Restraint System (SRS) ``AIR
BAG'' (2WD models)
The Supplemental Restraint System ``AIR BAG'', used along with a seat belt, helps to reduce the risk or
severity of injury to the driver in a frontal collision. The Supplemental Restraint System consists of air bag
module (located in the center of the steering wheel), diagnosis sensor unit, warning lamp, wiring harness
and spiral cable.
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.
PRECAUTION
RS-1

Precautions for SRS ``AIR BAG'' Service
lDo not use a circuit tester to check SRS circuits unless instructed to in this Service Manual.
lBefore servicing the SRS, turn ignition switch ``OFF'', disconnect both battery cables and wait for at least
3 minutes.
For approximately 3 minutes after the cables are removed, it is still possible for the air bag to deploy.
Therefore, do not work on any SRS connectors or wires until at least 3 minutes have passed.
lFor 2WD models, do not separate diagnosis sensor unit from steering wheel.
lFor 4WD models, diagnosis sensor unit must always be installed with their arrow marks ``S'' 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 it with the pad side facing upward.
lConduct self-diagnosis to check entire SRS for proper function after replacing any components.
Special Service Tools
Tool number
Tool nameDescription
KV99106400
Deployment tool
NT357
Disposing of air bag module
KV99105300
Air bag module bracket
NT354
Anchoring air bag module
HT61961000 and
HT62152000 combined
*1 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)
*1: Special tool or commercial equivalent
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
RS-6

Description
The air bag deploys if the diagnosis sensor unit activates while the ignition switch is in the ``ON'' or ``START''
position.
SRS314
SRS293-A
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
RS-7

Maintenance Items
CAUTION:
Do not use a circuit tester to check SRS circuit.
1. Check ``AIR BAG'' warning lamp operation.
After turning ignition key to ``ON'' position, ``AIR BAG'' warn-
ing lamp illuminates. The ``AIR BAG'' warning lamp will turn
off after about 7 seconds if no malfunction is detected.
If any of the following air bag warning lamp conditions occur,
immediately check the air bag system. Refer to RS-28 (4WD
models), RS-19 (2WD models) for details.
lThe warning lamp does not illuminate when the ignition
switch is turned ``ON''.
lThe warning lamp does not turn off about 7 seconds after the
ignition switch is turned ``ON''.
lThe warning lamp blinks about 7 seconds after the ignition
switch is turned ``ON''.
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. Check harness
cover and connectors for damage, terminals for deformities,
and harness for binding.
lInstall driver side air bag module to steering wheel to check
fit and alignment with the wheel.
lCheck steering wheel for excessive free play.
(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 and air bag harness
lCheck connectors for poor connections, damage, and termi-
nals for deformities.
lCheck harnesses for binding, chafing or cut.
CAUTION:
Replace previously used special bolts and ground bolt with
new ones.
SRS296
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
RS-9

Removal and Installation Ð Diagnosis
Sensor Unit (4WD models)
CAUTION:
lBefore servicing SRS, turn the ignition switch off, disconnect both battery cables and wait for 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 for proper installation.
lCheck diagnosis sensor unit to ensure they are free of deformities, dents, cracks or rust. If they
show any visible signs of damage, replace them with new ones.
lCheck diagnosis sensor unit brackets to ensure they are free of deformities or rust.
lReplace diagnosis sensor unit if it has been dropped or sustained an impact.
lAfter replacement of diagnosis sensor unit, perform self-diagnosis for SRS. Refer to ``Self-diag-
nosis'' for details (RS-28).
REMOVAL OF DIAGNOSIS SENSOR UNIT
1. Disconnect air bag module connector.
2. Remove console box. Refer to ``INSTRUMENT PANEL'' in
BT section. (4WD Double Cab models)
3. Remove console bracket.
4. Disconnect diagnosis sensor unit connector.
5. Remove bolt and also remove special bolts using the
TAMPER RESISTANT TORX (Size T50), from diagnosis
sensor unit.
Then remove the diagnosis sensor unit.
NOTE:
lTo install, reverse the removal procedure sequence.
SRS396
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
RS-10

CAUTION:
lDo not attempt to disassemble spiral cable.
lDo not apply lubricant to the spiral cable.
lFor 2WD models, do not separate diagnosis sensor unit
from steering wheel.
Installation Ð Air Bag Module and Spiral
Cable
1. Set the front wheels in the straight-ahead position.
2. Connect spiral cable connector and tighten spiral cable with
screws. Install steering column cover.
CAUTION:
lThe spiral cable may snap due to steering operation if
the cable is installed in an improper position.
lAlso, with the steering linkage disconnected, the cable
may snap by turning the steering wheel beyond the lim-
ited number of turns. The spiral cable can be turned left
about 2.5 turns from the right end position.
3. Make sure that the spiral cable is in the neutral position.
The neutral position is detected by turning left about 2.5
revolutions from the right end position. Align the two marks
(
,
m).
4WD MODELS
4. Install steering wheel setting spiral cable pin guide, and pull
spiral cable through.
5. Connect horn connector and engage spiral cable with pawls
in steering wheel.
6. Tighten nut.
:29-39Nzm (3.0 - 4.0 kg-m, 22 - 29 ft-lb)
2WD MODELS
4. Install steering wheel setting spiral cable pin guide, and pull
spiral cable through.
5. Connect spiral cable steering connector to diagnosis sensor
unit in steering wheel.
6. Tighten nut.
:29-39Nzm (3.0 - 4.0 kg-m, 22 - 29 ft-lb)
SRS399
SRS166-B
MBF648BB
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
Removal Ð Air Bag Module and Spiral Cable
(Cont'd)
RS-13

REPAIR PROCEDURES
CAUTION:
Before servicing air bag, turn the ignition switch off and disconnect both battery cables and wait at
least 3 minutes.
Warning lamp operation Explanation Repair order
Warning lamp blinks.*Open or short in the air bag module cir-
cuit.1. Visually check the wiring harness and connectors.
2. Replace air bag module.
3. Replace steering wheel assembly (including diagnosis
sensor unit). Malfunctioning diagnosis sensor unit
Warning lamp does not illu-
minate at all.Meter fuse is blown.
1. Check meter fuse.
2. Visually check the wiring harnesses and connectors.
3. Check warning lamp LED.
4. Replace spiral cable.
5. Replace steering wheel assembly (including diagnosis
sensor unit).
6. Replace combination meter. Open in the warning lamp power supply
circuit
Short circuit between the warning lamp
and diagnoses sensor unit.
Malfunctioning LED
Malfunctioning combination meter
Malfunctioning diagnosis sensor unit
Warning lamp is continu-
ously ON.SRS air bag fuse is blown.1. Check air bag fuse.
2. Visually check the wiring harnesses and connectors for
combination meter, diagnosis sensor unit and spiral
cable.
3. Replace spiral cable.
4. Replace steering wheel assembly (including diagnosis
sensor unit). Open in circuit between the warning
lamp and diagnoses sensor unit.
Malfunctioning diagnosis sensor unit
*: After air bag is deployed, the warning lamp might blink due to an open circuit in the air bag module.
Follow the procedures in numerical order when repairing malfunctioning parts. Confirm whether malfunction is eliminated
using the air bag warning lamp each time repair is finished. If malfunction is still observed, proceed to the next step. When
malfunction is eliminated, further repair work is not required.
TROUBLE DIAGNOSES Ð Supplemental Restraint System (SRS) Ð
2WD models
Self-diagnosis (Cont'd)
RS-20