INSTALLATION INFINITI QX4 2001 Factory Service Manual

Precautions
SUPPLEMENTAL RESTRAINT SYSTEM (SRS) ªAIR BAGº AND ªSEAT BELT
PRE-TENSIONERº
NBRS0001The 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 composition which is available to INFINITI QX4 is as follows:
IFor a frontal collision
The Supplemental Restraint System consists of driver air bag module (located in the center of the steer-
ing 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.
IFor a side collision
The Supplemental Restraint System consists of 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).
WARNING:
ITo 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 performed
by an authorized INFINITI dealer.
IImproper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system.
IDo 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.
PRECAUTION FOR SEAT BELT SERVICENBRS0002CAUTION:
IBefore removing the seat belt pre-tensioner assembly, turn the ignition switch off, disconnect both
battery cables and wait at least 3 minutes.
IDo not use electrical test equipment for seat belt pre-tensioner connector.
IAfter replacing or reinstalling seat belt pre-tensioner assembly, or reconnecting seat belt pre-ten-
sioner connector, check the system function. Refer to ªSRS Operation Checkº (RS-38) for details.
IDo not use disassemble buckle or seat belt assembly.
IReplace anchor bolts if they are deformed or worn out.
INever oil tongue and buckle.
IIf any component of seat belt assembly is questionable, do not repair. Replace the whole seat belt
assembly.
IIf webbing is cut, frayed, or damaged, replace seat belt assembly.
IWhen replacing seat belt assembly, use a genuine seat belt assembly.
After A CollisionNBRS0002S01WARNING:
Inspect all seat belt assemblies including retractors and attaching hardware after any collision.
NISSAN recommends that all seat belt assemblies in use during a collision be replaced unless the
collision was minor and the belts show no damage and continue to operate properly. Failure to do so
could result in serious personal injury in an accident. Seat belt assemblies not in use during a colli-
sion should also be replaced if either damage or improper operation is noted. Seat belt pre-tensioner
should be replaced even if the seat belts are not in use during a frontal collision in which the air bags
are deployed.
Replace any seat belt assembly if:
IThe seat belt was in use at the time of a collision (except for minor collisions and the belts, retractors and
buckles show no damage and continue to operate properly).
IThe seat belt was damaged in an accident. (i.e. torn webbing, bent retractor or guide, etc.)
IThe seat belt attaching point was damaged in an accident. Inspect the seat belt attaching area for dam-
age or distortion and repair as necessary before installing a new seat belt assembly.
IAnchor bolts are deformed or worn out.
IThe seat belt pre-tensioner should be replaced even if the seat belts are not in use during the collision in
which the air bags are deployed.
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SEAT BELTS
Precautions
RS-3

Front Seat Belt
REMOVAL AND INSTALLATION=NBRS00031. Slide the seat all the way forward and tilt the seatback toward the front.
2. Remove adjuster cover.
3. Remove floor anchor bolt.
4. Remove shoulder anchor bolt.
5. Remove center pillar upper and lower garnish. Refer to BT-28, ªSIDE AND FLOOR TRIMº for details.
6. Disconnect seat belt pre-tensioner connector.
7. Remove the bolt securing seat belt retractor, then remove seat belt and seat belt retractor.
8. Remove bolts securing seat belt adjuster, then remove seat belt adjuster.
SRS873
SEAT BELTS
Front Seat Belt
RS-4

Rear Seat Belt
REMOVAL AND INSTALLATION=NBRS00041. Raise up rear seat cushion.
2. Remove outer anchor bolt.
3. Remove rear side upper and lower garnish. Refer to BT-28, ªSIDE AND FLOOR TRIMº for details.
4. Remove anchor through-bolt.
5. Remove anchor bolt and bolt securing rear seat belt retractor, then remove seat belt and seat belt
retractor.
6. Remove each anchor bolt.
SRS654-A
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SEAT BELTS
Rear Seat Belt
RS-5

Precautions
SUPPLEMENTAL RESTRAINT SYSTEM (SRS) ªAIR BAGº AND ªSEAT BELT
PRE-TENSIONERº
NBRS0005The 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 composition which is available to INFINITI QX4 is as follows:
IFor a frontal collision
The Supplemental Restraint System consists of driver air bag module (located in the center of the steer-
ing 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.
IFor a side collision
The Supplemental Restraint System consists of 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).
WARNING:
ITo 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 performed
by an authorized INFINITI dealer.
IImproper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system.
IDo 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 FOR SRS ªAIR BAGº AND ªSEAT BELT PRE-TENSIONERº SERVICENBRS0006IDo not use electrical test equipment to check SRS circuits unless instructed to in this Service Manual.
IBefore 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.
IDiagnosis sensor unit must always be installed with their arrow marks ªgº 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.
IThe 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.
IHandle air bag module carefully. Always place driver and passenger air bag modules with the pad side
facing upward and side air bag module (built-in type) standing with the stud bolt side setting bottom.
IConduct self-diagnosis to check entire SRS for proper function after replacing any components.
IAfter air bag inflates, the front instrument panel assembly should be replaced if damaged.
WIRING DIAGRAMS AND TROUBLE DIAGNOSISNBRS0007When you read wiring diagrams, refer to the following:
IGI-11, ªHOW TO READ WIRING DIAGRAMSº
IEL-9, ªPOWER SUPPLY ROUTINGº for power distribution circuit
When you perform trouble diagnosis, refer to the following:
IGI-35, ªHOW TO FOLLOW TEST GROUPS IN TROUBLE DIAGNOSESº
IGI-24, ªHOW TO PERFORM EFFICIENT DIAGNOSIS FOR AN ELECTRICAL INCIDENTº
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
Precautions
RS-10

Diagnosis Sensor Unit
REMOVAL AND INSTALLATIONNBRS0012CAUTION:
IBefore servicing SRS, turn the ignition switch off, discon-
nect both battery cables and wait for at least 3 minutes.
IThe 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.
ICheck diagnosis sensor unit for proper installation.
ICheck diagnosis sensor unit to ensure it is free of
deformities, dents, cracks or rust. If they show any visible
signs of damage, replace them with new ones.
ICheck diagnosis sensor unit brackets to ensure they are
free of deformities or rust.
IReplace diagnosis sensor unit if it has been dropped or
sustained an impact.
IAfter replacement of diagnosis sensor unit, perform self-
diagnosis for SRS. Refer to ªSRS Operation Checkº for
details (RS-38).
SRS636-A
1. Disconnect connectors for driver and passenger air bag mod-
ules and seat belt pre-tensioner.
2. Remove console box. Refer to BT-21, ªINSTRUMENT PANEL
ASSEMBLYº.
3. Disconnect diagnosis sensor unit connector.
4. Remove ground bolt and also remove special bolts using the
TAMPER RESISTANT TORX (Size T50), from diagnosis sen-
sor unit.
Then remove the diagnosis sensor unit.
NOTE:
ITo install, reverse the removal procedure sequence.
SRS651-C
Seat Belt Pre-tensioner
REMOVAL AND INSTALLATIONNBRS0034CAUTION:
IBefore servicing SRS, turn the ignition switch off, discon-
nect both battery cables and wait at least 3 minutes.
ICheck seat belt pre-tensioner with load limiter for proper
installation.
IAfter replacement of seat belt pre-tensioner, check SRS
function and perform self-diagnosis for SRS. Refer to
ªSRS Operation Checkº for details. (RS-38)
IDo not attempt to disassemble seat belt pre-tensioner with
load limiter.
IReplace seat belt pre-tensioner if it has been dropped or
sustained an impact.
IDo not expose seat belt pre-tensioner to temperatures
exceeding 80ÉC (176ÉF).
For removal of seat belt pre-tensioner, refer to ªFront Seat Beltº for
details. (RS-4)
NOTE:
ITo install, reverse the removal procedure sequence.
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
Diagnosis Sensor Unit
RS-15

Satellite Sensor
REMOVAL AND INSTALLATIONNBRS0035CAUTION:
IBefore servicing SRS, turn the ignition switch off, discon-
nect both battery cables and wait at least 3 minutes.
IDo not use old bolts coated with bonding agent after
removal; replace with new ones.
ICheck satellite sensor for proper installation.
ICheck satellite sensor to ensure they are free of
deformities, dents, cracks or rust. If it shows any visible
signs of damage, replace it with new one.
IAfter replacement of satellite sensor, check SRS function
and perform self-diagnosis for SRS. Refer to ªSRS Opera-
tion Checkº for details. (RS-38)
IDo not attempt to disassemble satellite sensor.
IReplace satellite sensor if it has been dropped or sus-
tained an impact.
SRS642-A
1. Remove seat belt pre-tensioner with load limiter. Refer to
ªFront Seat Beltº for details. (RS-4)
2. Disconnect satellite sensor connector.
3. Remove bolt and nuts from satellite sensor unit.
Then remove the satellite sensor.
NOTE:
ITo install, reverse the removal procedure sequence.
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
Satellite Sensor
RS-16

Driver Air Bag Module and Spiral Cable
REMOVAL AND INSTALLATIONNBRS0013
SRS782-A
SBF811E
REMOVALNBRS0014CAUTION:
IBefore servicing SRS, turn the ignition switch off, discon-
nect both battery cables and wait at least 3 minutes.
IAlways work from the side of air bag module.
1. Remove lower lid from steering wheel, and disconnect air bag
module connector.
SBF812E
2. Remove side lids, ASCD steering switch and Audio steering
switch (or TEL switch). Using the TAMPER RESISTANT TORX
(Size T50), remove left and right special bolts. Air bag module
can then be removed.
SRS161
CAUTION:
IAlways place air bag module with pad side facing upward.
IDo not attempt to disassemble air bag module.
IThe special bolts are coated with bonding agent. Do not
use old bolts after removal; replace with new ones.
IDo not insert any foreign objects (screwdriver, etc.) into
air bag module connector.
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
Driver Air Bag Module and Spiral Cable
RS-17

SBF814E
IReplace air bag module if it has been dropped or sus-
tained an impact.
IDo not expose the air bag module to temperatures exceed-
ing 90ÉC (194ÉF).
IDo not allow oil, grease or water to come in contact with
the air bag module.
SBF239F
3. Set steering wheel in the neutral position.
4. Disconnect horn connector and remove nuts.
5. Remove dynamic damper. Then using steering wheel puller,
remove steering wheel. Be careful not to over-tighten puller
bolt on steering wheel.
CAUTION:
IDo not tap or bump the steering wheel.
6. Remove steering column cover.
SRS384
7. Unlock the spiral cable connector. Then disconnect connectors
and remove the four screws. The spiral cable can then be
removed.
CAUTION:
IDo not attempt to disassemble spiral cable.
IDo not apply lubricant to the spiral cable.
SRS276
INSTALLATIONNBRS00151. Set the front wheels in the straight-ahead position.
2. Make sure that the spiral cable is in the neutral position.
The neutral position is detected by turning left about 2.5 revo-
lutions from the right end position. Align the two marks (
).
CAUTION:
IThe spiral cable may snap due to steering operation if the
cable is installed in an improper position.
IAlso, with the steering linkage disconnected, the cable
may snap by turning the steering wheel beyond the limited
number of turns. The spiral cable can be turned to the left
about 2.5 turns from the right end position.
3. Connect spiral cable connector and tighten with screws. Install
steering column cover.
4. Install steering wheel, aligning with spiral cable pin guides, and
pull spiral cable through.
5. Connect horn connector and engage spiral cable with pawls in
steering wheel. Move air bag module connector away from
steering wheel lower lid opening.
6. Tighten nut.
: 29.4 - 39.2 N´m (3.0 - 4.0 kg-m, 22 - 28 ft-lb)
7. Install dynamic damper.
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
Driver Air Bag Module and Spiral Cable (Cont'd)
RS-18

SRS949
SRS164
CAUTION:
IAlways place air bag module with pad side facing upward.
IDo not attempt to disassemble air bag module.
IThe special bolts are coated with bonding agent. Do not
use old bolts after removal; replace with new coated bolts.
IDo not insert any foreign objects (screwdriver, etc.) into
air bag module connector.
SBF814E
IReplace air bag module if it has been dropped or sus-
tained an impact.
IDo not expose the air bag module to temperatures exceed-
ing 90ÉC (194ÉF).
IDo not allow oil, grease or water to come in contact with
the air bag module.
IAfter air bag inflates, the front instrument panel assembly
should be replaced if damaged.
SRS948
INSTALLATIONNBRS0017CAUTION:
IAlways work from the side of or under air bag module.
1. Install front passenger air bag module to instrument panel
assembly.
2. Install instrument panel.
IEnsure harness is not caught between rear of air bag module
and steering member.
3. Install front passenger air bag module to steering member.
SRS949
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
Front Passenger Air Bag Module (Cont'd)
RS-20

SBF814E
IReplace air bag module if it has been dropped or sus-
tained an impact.
IDo not expose the air bag module to temperatures exceed-
ing 90ÉC (194ÉF).
IDo not allow oil, grease or water to come in contact with
the air bag module.
IAfter air bag inflates, all parts of front seatback (including
front seatback frame) should be replaced.
SRS684
INSTALLATIONNBRS00371. Install side air bag module on seatback frame with new torx
nuts coated with bonding agent.
2. Install side air bag connector.
3. Install seatback trim. Refer to BT-41, ªFRONT SEATº for details.
SRS683
4. Secure the inner cloth which covers the side air bag module
with nuts.
SRS725
5. Connect side air bag module connector.
6. Install seatback board with new clips.
7. Connect both battery cables.
8. Go to ªSRS Operation Checkº, RS-38 and perform self-diag-
nosis to ensure entire SRS operates properly. (Use CON-
SULT-II or air bag warning lamp.)
Disposal of Air Bag Module and Seat Belt Pre-
tensioner
NBRS0018IBefore disposing of air bag module and seat belt pre-tensioner,
or vehicles equipped with such systems, deploy the systems.
If such systems have already been deployed due to an
accident, dispose of them as indicated in ªDISPOSING OF AIR
BAG MODULE AND SEAT BELT PRE-TENSIONERº (RS-28).
IWhen deploying the air bag module and seat belt pre-
tensioner, always use the Special Service Tool; Deployment
tool KV99106400 (Kent-Moore No. J38381).
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
Side Air Bag Module (Cont'd)
RS-22