1998 NISSAN PICK-UP Repair Manual

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

SRS Component Parts Location
SRS394
SRS395
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
RS-8

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

Removal and Installation Ð Air Bag Module
and Spiral Cable (4WD models)
Removal and Installation Ð Air Bag Module
and Spiral Cable (2WD models)
SRS397
SRS398
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
RS-11

Removal Ð Air Bag Module and Spiral Cable
CAUTION:
lBefore servicing SRS, turn the ignition switch off, dis-
connect both battery cables and wait for at least 3 min-
utes.
lAlways work from the side of air bag module.
1. Remove lower lid from steering wheel, and disconnect air
bag module connector.
2. Remove side lids. Using the TAMPER RESISTANT TORX
(Size T50), remove left and right special bolts. Air bag mod-
ule can then be removed.
CAUTION:
lAlways place air bag module with pad side facing
upward.
lDo not attempt to disassemble air bag module.
lThe special bolts are coated with bonding agent. Do not
use old bolts after removal; replace with new ones.
lReplace air bag module if it has been dropped or sus-
tained an impact.
lDo not expose the air bag module to temperatures
exceeding 90ÉC (194ÉF).
lDo not allow oil, grease or water to come in contact with
the air bag module.
3. Set steering wheel in the neutral position.
4. Disconnect horn connector (Dual Air Bag System)/spiral
cable steering connector (Single Air Bag System) and
remove nuts.
5. Using steering wheel puller, remove steering wheel. Be care-
ful not to over-tighten puller bolt on steering wheel.
CAUTION:
lDo not tap or bump the steering wheel.
6. Remove steering column cover.
7. Disconnect connectors and remove the four screws. The spi-
ral cable can then be removed.
SBF811E
SBF812E
MRS120A
SBF814E
SBF239F
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
RS-12

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