2004 INFINITI QX56 instrument

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
SRS-7
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SRS
Revision: August 20072004 QX56
unit can disable the passenger front air bag completely. If this occurs the air bag diagnosis sensor unit will turn
on the PASS AIR BAG OFF indicator located in the center of the instrument panel (cluster lid C).
Direct-connect SRS Component ConnectorsEHS000W9
The following SRS components use direct-connect style harness connectors.

Driver front air bag module

Passenger front air bag module

LH side curtain air bag module

RH side curtain air bag module

Front LH seat belt pre-tensioner

Front RH seat belt pre-tensioner

Front LH seat belt buckle pre-tensioner assembly

Front RH seat belt buckle pre-tensioner assembly
Always pull up to release black locking tab prior to removing connector from SRS component.
Always push down to lock black locking tab after installing connector
to SRS component. When locked, the black locking tab is level with
the connector housing.
WHIA0187E
WHIA0103E

SRS-50
FRONT PASSENGER AIR BAG MODULE
Revision: August 20072004 QX56
FRONT PASSENGER AIR BAG MODULEPFP:K8515
Removal and InstallationEHS000WN
The passenger air bag module originally installed in the vehicle uses direct-connect style harness connectors.
Service replacement passenger air bag modules use tab-locking style harness connectors. If the passenger
air bag module is replaced or if the direct-connect harness connectors are damaged, the vehicle wiring har-
ness must be modified to allow connection of the service replacement passenger air bag module. Refer to
SRS-51, "
WIRING HARNESS MODIFICATION" for wiring harness modification procedure.
REMOVAL
CAUTION:

Do not attempt to repair or replace damaged direct-connect front passenger air bag module con-
nectors. If a direct-connect harness connector is damaged, the front passenger air bag must be
replaced and the wiring harness modified.

Before servicing SRS, turn the ignition switch off, disconnect both battery cables and wait at least
3 minutes.

Always work from the side of or under front passenger air bag module.
1. Remove the glove box. Refer to IP-10, "
INSTRUMENT PANEL ASSEMBLY" .
2. Remove 2 nuts (through glove box opening) retaining front pas-
senger air bag module to instrument panel crossmember.
3. Disconnect the air bag module electrical connectors.

For removal/installation of the direct-connect SRS connec-
tors, refer to SRS-7, "
Direct-connect SRS Component Con-
nectors" .
4. Remove the instrument panel assembly from the vehicle. Refer
to IP-10, "
INSTRUMENT PANEL ASSEMBLY" .
5. Remove front passenger air bag module nuts and remove air
bag module from the instrument panel assembly.
CAUTION:

When servicing the SRS, do not work from directly in front
of air bag module.

Always place front passenger air bag module with caution
label side facing upward.

Do not insert any foreign objects (screwdriver, etc.) into air
bag module or harness connectors.

Do not disassemble air bag module.

Do not use old nuts after removal; replace with new nuts.

Do not expose the front passenger air bag module to tem-
peratures exceeding 90°C (194°F).

Replace the air bag module if it has been dropped or sus-
tained an impact.

Do not allow oil, grease or water to come in contact with the
air bag module.

For removal/installation of the direct-connect SRS connec-
tors, refer to SRS-7, "
Direct-connect SRS Component Con-
nectors" .
INSTALLATION
Original Passenger Air Bag Module
To install, reverse the removal procedure.
WHIA0110E
W H I A 0111 E
SBF 8 14 E

FRONT PASSENGER AIR BAG MODULE
SRS-51
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SRS
Revision: August 20072004 QX56

For removal/installation of the direct-connect SRS connectors, refer to SRS-7, "Direct-connect SRS Com-
ponent Connectors" .
CAUTION:

Always work from the side of or under front passenger air bag module.

After the work is completed, perform self-diagnosis to check that no malfunction is detected.
Refer to SRS-20, "
SRS Operation Check" .
Service Replacement Passenger Air Bag Module
1. Install the front passenger air bag module to the instrument
panel pad assembly.
2. Install the instrument panel assembly. Refer to IP-10, "
INSTRUMENT PANEL ASSEMBLY" .
3. Connect the front passenger air bag module harness connector to yellow 4-pin service replacement air
bag connector and fasten connector to mounting bracket.
CAUTION:

Always work from the side of or under front passenger air bag module.

After the work is completed, perform self-diagnosis to check that no malfunction is detected.
Refer to SRS-20, "
SRS Operation Check" .
WIRING HARNESS MODIFICATION
The passenger air bag module originally installed in the vehicle uses direct-connect style harness connectors.
Service replacement passenger air bag modules use tab-locking style harness connectors. If the passenger
air bag module is replaced or if the direct-connect harness connectors are damaged, the vehicle wiring har-
ness must be modified to allow connection of the service replacement passenger air bag module.
NOTE:
The wiring harness modification is to be performed only if the vehicle is equipped with the original passenger
air bag which uses direct-connect harness connectors. If the passenger air bag is to be replaced in a vehicle
that has already had the service replacement passenger air bag installed, the wiring harness modification is
not required.
CAUTION:

Do not attempt to repair or replace damaged direct-connect front passenger air bag module con-
nectors. If a direct-connect harness connector is damaged, the front passenger air bag must be
replaced and the wiring harness modified.

Before servicing SRS, turn the ignition switch off, disconnect both battery cables and wait at least
3 minutes.

Always work from the side of or under front passenger air bag module.

After the work is completed, perform self-diagnosis to check that no malfunction is detected.
Refer to SRS-20, "
SRS Operation Check" .
1. Locate the yellow and orange direct-connect passenger air bag module harness connectors.
2. Use wire cutters to cut back both previously used direct-connect passenger air bag module harness con-
nectors from the vehicle wiring harness approximately 50 mm (1.9 in) from the connectors.
3. Remove approximately 150 mm (5.9 in) of the vehicle harness covering from the cut end.
WHIA0110E

SRS-58
DIAGNOSIS SENSOR UNIT
Revision: August 20072004 QX56
DIAGNOSIS SENSOR UNITPFP:28556
Removal and InstallationEHS0 00 W T
REMOVAL
CAUTION:

Before servicing the SRS, turn the ignition switch off, disconnect both battery cables and wait at
least 3 minutes.
1. Disconnect the harness connectors for each air bag module and seat belt pre-tensioner.
2. Remove center console. Refer to IP-10, "
INSTRUMENT PANEL ASSEMBLY" .
3. Disconnect diagnosis sensor unit harness connectors.
4. Remove fixing bolts from the diagnosis sensor unit.
CAUTION:

Do not use old bolts; replace with new bolts.

Check diagnosis sensor unit bracket to ensure it is free of deformities, dents, cracks or rust. If it
shows any visible signs of damage, replace with new one.

Replace diagnosis sensor unit if it has been dropped or sustained an impact.
INSTALLATION
To install, reverse the removal procedure.

After the work is completed, perform self-diagnosis to check that no malfunction is detected. Refer to
SRS-20, "
SRS Operation Check" .
CAUTION:

The diagnosis sensor unit must always be installed with the arrow mark "⇐" pointing toward the
front of the vehicle for proper operation.
ECU DISCRIMINATED NO.
After replacing the diagnosis sensor unit, confirm that the diagnosis sensor unit identification is correct for the
vehicle as equipped. Refer to SRS-18, "
CONSULT-II Function (AIR BAG)" .
LHIA0053E

SRS-60
COLLISION DIAGNOSIS
Revision: August 20072004 QX56
COLLISION DIAGNOSISPFP:00015
For Frontal CollisionEHS000WW
Check the SRS components using the following table.

After the work is completed, perform self-diagnosis to check that no malfunction is detected. Refer to
SRS-20, "
SRS Operation Check" .
SRS INSPECTION (FOR FRONTAL COLLISION)
Part SRS is activated SRS is NOT activated
Air bag module
(driver and front pas-
senger air bag mod-
ule)REPLACE
Install with new fas-
teners.1. Remove air bag module. Check harness cover and connectors for damage, termi-
nals for deformities, and harness for binding.
2. Install driver air bag module into the steering wheel to check fit and alignment with
the wheel.
3. Install passenger air bag module into the instrument panel to check fit with the
instrument panel.
4. If no damage is found, reinstall with new fasteners.
5. If damaged—REPLACE. Install air bag modules with new fasteners.
Crash zone sensor REPLACE the crash
zone sensor and
bracket with new fas-
teners.1. Remove the crash zone sensor. Check harness connectors for damage, terminals
for deformities, and harness for binding.
2. Check for visible signs of damage (dents, cracks, deformation) of the crash zone
sensor and bracket.
3. Install the crash zone sensor to check fit.
4. If no damage is found, reinstall with new fasteners.
5. If damaged—REPLACE the crash zone sensor and bracket with new fasteners.
Seat belt pre-ten-
sioner assemblies
and seat belt buckle
pre-tensioner assem-
bliesREPLACE
Install seat belt pre-
tensioner and seat
belt buckle pre-ten-
sioner assemblies
with new fasteners.1. Remove seat belt pre-tensioners and seat belt buckle pre-tensioner assemblies.
Check harness cover and connectors for damage, terminals for deformities, and
harness for binding.
2. Check belts for damage and anchors for loose mounting.
3. Check retractor for smooth operation.
4. Check seat belt adjuster for damage.
5. If no damage is found, reinstall seat belt pre-tensioner assembly.
6. If damaged—REPLACE. Install the seat belt pre-tensioners or seat belt buckle pre-
tensioner assemblies with new fasteners.
Diagnosis sensor unit REPLACE
Install with new fas-
teners.1. Check case for dents, cracks or deformities.
2. Check connectors for damage, and terminals for deformities.
3. If no damage is found, reinstall with new fasteners.
4. If damaged—REPLACE. Install diagnosis sensor unit with new fasteners.
Steering wheel 1. Visually check steering wheel for deformities.
2. Check harness (built into steering wheel) and connectors for damage, and terminals for deformities.
3. Install driver air bag module into the steering wheel to check fit and alignment with the wheel.
4. Check steering wheel for excessive free play.
5. If no damage is found, reinstall.
6. If damaged—REPLACE.
Spiral cable REPLACE the spiral
cable.1. Visually check spiral cable and combination switch for damage.
2. Check connectors and protective tape for damage.
3. Check steering wheel for noise, binding or heavy operation.
4. If no damage is found, reinstall.
5. If damaged—REPLACE.
Occupant classifica-
tion system (Passen-
ger seat)1. Remove passenger seat.
2. Check control unit case for dents, cracks of deformities.
3. Check connectors and pressure sensor tube for damage, and terminals for deformities.
4. Check seat frame and cushion pan for dents or deformities.
5. If no damage is found, reinstall seat with new fasteners.
6. If damaged — REPLACE seat cushion assembly with new fasteners.

COLLISION DIAGNOSIS
SRS-61
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SRS
Revision: August 20072004 QX56
For Side CollisionEHS0 00 W X
Check the SRS components using the following table.

After the work is completed, perform self-diagnosis to check that no malfunction is detected. Refer to
SRS-20, "
SRS Operation Check" .
WHEN SRS IS ACTIVATED IN THE SIDE COLLISION
1. Replace the following components:
–Front seat back assembly (on the side on which side air bag is activated)
–Diagnosis sensor unit
–(LH or RH) side air bag (satellite) sensor (on the side on which side air bag is activated)
2. Check the SRS components and the related parts using the following table.
–Replace any SRS components and the related parts showing visible signs of damage (dents, cracks,
deformation).
3. Conduct self-diagnosis using CONSULT-II and “AIR BAG” warning lamp. Refer to SRS-20, "
SRS Opera-
tion Check" for details. Ensure entire SRS operates properly.
WHEN SRS IS NOT ACTIVATED IN THE SIDE COLLISION
1. Check the SRS components and the related parts using the following table.
–If the front seat back assembly is damaged, the front seat back assembly must be replaced.
2. Conduct self-diagnosis using CONSULT-II and “AIR BAG” warning lamp. Refer to SRS-20, "
SRS Opera-
tion Check" for details. Ensure entire SRS operates properly.
SRS INSPECTION (FOR SIDE COLLISION)
Harness and connec-
tors1. Check connectors for poor connection, damage, and terminals for deformities.
2. Check harness for binding, chafing, cuts, or deformities.
3. If no damage is found, reinstall the harness and connectors.
4. If damaged—REPLACE the damaged harness. Do not attempt to repair, splice or modify any SRS harness.
Instrument panel
REPLACE the instru-
ment panel assembly.1. Visually check instrument panel for damage.
2. If no damage is found, reinstall the instrument panel.
3. If damaged—REPLACE the instrument panel. Part SRS is activated SRS is NOT activated
Part SRS is activated SRS is NOT activated
(LH or RH) side cur-
tain air bag moduleReplace the side cur-
tain air bag module.
(Repair the center pil-
lar inner, etc. before
installing new one if
damaged.)1. Check for visible signs of damage (dents, tears, deformation) of the center pillar on
the collision side.
2. If damaged—Remove the side curtain air bag module.
3. Check for visible signs of damaged (tears etc.) of the side curtain air bag module.
4. Check harness and connectors for damage, and terminals for deformities.
5. If no damage is found, reinstall the side curtain air bag module with new fasteners.
6. If damaged—REPLACE the side curtain air bag module with new fasteners.
Front (LH or RH) side
air bag moduleREPLACE front seat-
back assembly.1. Check for visible signs of damage (dents, tears, deformation) of the seat back on
the collision side.
2. Check harness and connectors for damage, and terminals for deformities.
3. If damaged—REPLACE the front seatback assembly.
(LH or RH) side air
bag (satellite) sensor REPLACE the side
air bag (satellite) sen-
sor on the collision
side with new fasten-
ers.
(Repair the center pil-
lar inner, etc. before
installing new one if
damaged.)1. Remove the side air bag (satellite) sensor on the collision side. Check harness
connectors for damage, terminals for deformities, and harness for binding.
2. Check for visible signs of damage (dents, cracks, deformation) of the side air bag
(satellite) sensor.
3. Install the side air bag (satellite) sensor to check fit.
4. If no damage is found, reinstall the side sir bag (satellite) sensor with new fasten-
ers.
5. If damaged—REPLACE the side air bag (satellite) sensor with new fasteners.

TF-98
TRANSFER CONTROL UNIT
Revision: August 20072004 QX56
TRANSFER CONTROL UNITPFP:33084
Removal and InstallationEDS00314
REMOVAL
1. Set transfer state as 2WD when 4WD shift switch is at 2WD, or as AUTO when 4WD shift switch is at
AUTO.
CAUTION:
When removing transfer control unit, transfer state must be at 2WD or AUTO.
2. Turn the ignition switch OFF and disconnect negative battery terminal.
3. Remove the glove box assembly. Refer to IP-14, "
Instrument Lower Cover RH and Glove Box" .
4. Disconnect the two transfer control unit connectors.
5. Remove the transfer control unit bolts.
6. Remove the transfer control unit.
INSTALLATION
Installation is in the reverse order of removal.

When installing the transfer control unit, tighten bolts to the specified torque.
CAUTION:

Do not connect harness connector to transfer control unit when 4WD shift switch is at 4LO.

After the installation, check perform self-diagnosis. Refer to TF-28, "SELF-DIAGNOSTIC PROCEDURE"
. If NG, adjust position between transfer assembly and transfer control unit.
BDIA0014E
Transfer control unit bolts : 5.1 N·m (0.52 kg-m, 45 in-lb)