INFINITI QX4 2001 Factory Service Manual

DescriptionNBRS0009
SRS585-F
The air bag deploys if the diagnosis sensor unit activates while the ignition switch is in the ªONº or ªSTARTº
position.
The collision modes for which supplemental restraint systems are activated are different among the SRS sys-
tems. For example, the driver air bag module and passenger air bag module are activated in a frontal colli-
sion 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 air bag moduleqÐÐ
Passenger air bag moduleqÐÐ
Seat belt pre-tensioner (Driver side)qÐÐ
Seat belt pre-tensioner (Passenger side)qÐÐ
Side air bag module (LH) ÐqÐ
Side air bag module (RH) Ð Ðq
SRS444
Seat Belt Pre-tensioner with Load LimiterNBRS0032The seat belt pre-tensioner system with load limiter is installed to
both the driver's seat and the front passenger's seat. It operates
simultaneously with the SRS air bag system in the event of a fron-
tal collision with an impact exceeding a specified level.
When the frontal collision with an impact exceeding a specified
level occurs, seat belt slack resulting from clothing or other factors
is immediately taken up by the pre-tensioner. Vehicle passengers
are securely restrained.
When passengers in a vehicle are thrown forward in a collision and
the restraining force of the seat belt exceeds a specified level, the
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
Description
RS-12

load limiter permits the specified extension of the seat belt by the
twisting of the ELR shaft, and a relaxation of the chest-area seat
belt web tension while maintaining force.
SRS560
Built-in Type Side Air BagNBRS0033Front side air bag is built-in type.
The front seat backs with built-in type side air bag have the labels
shown in figures at left.
SRS Component Parts LocationNBRS0010
SRS874
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
BT
HA
SC
EL
IDX
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
Seat Belt Pre-tensioner with Load Limiter (Cont'd)
RS-13

SRS797-A
Maintenance ItemsNBRS0011CAUTION:
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, air bag 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, immediately check the air bag
or seat belt pre-tensioner system. Refer to RS-38 for details.
IThe ªAIR BAGº warning lamp does not illuminate when the
ignition switch is turned ªONº.
IThe ªAIR BAGº warning lamp does not go off about 7 seconds
after the ignition switch is turned ªONº.
IThe ªAIR BAGº warning lamp blinks after about 7 seconds after
the ignition switch is turned ªONº.
2. Visually check SRS components.
1) Diagnosis sensor unit
ICheck diagnosis sensor unit and bracket for dents, cracks and
deformities.
ICheck connectors for damage, and terminals for deformities.
2) Air bag module and steering wheel
IRemove air bag module from steering wheel, instrument panel
or seatback. Check harness cover and connectors for damage,
terminals for deformities, and harness for binding.
IInstall driver air bag module to steering wheel to check fit or
alignment with the wheel.
ICheck steering wheel for excessive free play.
IInstall passenger air bag module to instrument panel to check
fit or alignment with the instrument panel.
IInstall side air bag module to seatback to check fit and align-
ment with the seat.
3) Spiral cable
ICheck spiral cable for dents, cracks, or deformities.
ICheck connectors and protective tape for damage.
ICheck steering wheel for noise, binding or heavy operation.
4) Main harness, air bag harness, body harness, side air bag
module sub-harness
ICheck connectors for poor connections, damage, and termi-
nals for deformities.
ICheck harnesses for binding, chafing or cut.
5) Seat belt pre-tensioner
ICheck harness cover and connectors for damage, terminals
for deformities, and harness for binding.
ICheck belts for damage and anchors for loose mounting.
ICheck retractor for smooth operation.
IPerform self-diagnosis for seat belt pre-tensioner using air bag
warning lamp or CONSULT-II. Refer to ªSRS Operation Checkº
for details. (RS-38)
6) Satellite sensor
ICheck satellite sensor (including bracket portion) for dents,
cracks or deformities.
ICheck connectors for damage, and terminals for deformities.
CAUTION:
Replace previously used special bolts and ground bolt with
new ones.
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
Maintenance Items
RS-14

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.
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
BT
HA
SC
EL
IDX
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.
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
BT
HA
SC
EL
IDX
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

SBF812EH
8. Position air bag module and tighten with new special bolts.
9. Connect air bag module connector.
10. Install steering switches and lids.
11. Conduct self-diagnosis to ensure entire SRS operates prop-
erly. (Use CONSULT-II or warning lamp check.)
Before performing self-diagnosis, connect both battery cables.
12. Turn steering wheel to the left end and then to the right end
fully to make sure that spiral cable is set in the neutral posi-
tion.
If air bag warning lamp blinks or stays ON (at the user mode),
it shows the spiral cable may be snapped due to its improper
position. Perform self-diagnosis again (use CONSULT-II or
warning lamp). If a malfunction is detected, replace the spiral
cable with a new one.
13. Perform self-diagnosis again to check that no malfunction is
detected.
SRS162
Front Passenger Air Bag Module
REMOVALNBRS0016CAUTION:
IBefore servicing SRS, turn the ignition switch off, discon-
nect both battery cables and wait for at least 3 minutes.
IAlways work from the side of or under air bag module.
1. Remove glove box assembly. Refer to BT-21, ªINSTRUMENT
PANEL ASSEMBLYº for details.
2. Disconnect front passenger air bag module connector from air
bag harness connector.
3. Remove instrument lower panel on passenger side. Refer to
BT-21, ªINSTRUMENT PANEL ASSEMBLYº for details.
SRS948
4. Remove hex bolts or special bolts using the TAMPER RESIS-
TANT TORX (Size T50) from front passenger air bag module.
5. Remove instrument panel assembly. Refer to BT-21, ªINSTRU-
MENT PANEL ASSEMBLYº for details.
6. Remove the bolts from left and right sides of front passenger
air bag module. Then remove the air bag module from the
instrument panel assembly.
IThe air bag module is heavy and should be supported using
both hands during removal.
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
BT
HA
SC
EL
IDX
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
Driver Air Bag Module and Spiral Cable (Cont'd)
RS-19

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

SRS162
4. Install instrument lower panel on passenger side.
5. Connect air bag module connector to air bag harness connec-
tor.
6. Install glove box assembly.
7. Connect both battery cables.
8. Conduct self-diagnosis to ensure entire SRS operates prop-
erly. (Use CONSULT-II or warning lamp check.)
SRS682
Side Air Bag Module
REMOVALNBRS0036CAUTION:
IBefore servicing SRS, turn the ignition switch OFF, dis-
connect both battery cables and wait at least 3 minutes.
IAlways work from the rear of the air bag module.
1. Remove seatback board.
IWhen using a clip removal tool to remove the seatback
board, take care not to damage the air bag harness.
2. Disconnect side air bag module connector by sliding tab.
SRS683
3. Pull up the seatback trim.
4. Remove the nuts securing the inner cloth with seatback frame.
Then pull up the inner cloth.
5. Remove seatback trim. Refer to BT-41, ªFRONT SEATº for
details.
SRS684
6. Remove the torx nuts coated with bonding agent from the side
air bag module.
7. Remove side air bag connector. Side air bag module can then
be removed.
SRS623
CAUTION:
IAlways place the air bag module stading with the stud bolt
side setting bottom.
IDo not attempt to disassemble air bag module.
IThe torx nuts are coated with bonding agent. Do not use
old nuts after removal; replace with new coated nuts.
IDo not insert any foreign objects (screwdriver, etc.) into
air bag module connector.
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
BT
HA
SC
EL
IDX
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
Front Passenger Air Bag Module (Cont'd)
RS-21