Infiniti QX4 (R50). Manual — part 525
SEAT BELT RETRACTOR ON-VEHICLE CHECK
NBRS0029S03
Emergency Locking Retractors (ELR) and Automatic Locking Retractors (ALR)
NBRS0029S0301
NOTE:
All seat belt retractors are of the Emergency Locking Retractors (ELR) type. In an emergency (sudden stop)
the retractor will lock and prevent the belt from extending any further. All 3-point type seat belt retractors except
the driver’s seat belt also have an Automatic Locking Retractors (ALR) mode. The ALR mode (also called child
restraint mode) is used when installing child seats. The ALR mode is activated when the seat belt is fully
extended. When the belt is then retracted partially, the ALR mode automatically locks the seat belt in a spe-
cific position so the belt cannot be extended any further. To cancel the ALR mode, allow the seat belt to fully
wind back into the retractor.
Check the seat belt retractors using the following test(s) to determine if a retractor assembly is operating
properly.
ELR Function Stationary Check
NBRS0029S0302
Grasp the shoulder belt and pull forward quickly. The retractor should lock and prevent the belt from extend-
ing further.
ALR Function Stationary Check
NBRS0029S0304
1. Pull out entire length of seat belt from retractor until a click is heard.
2. Retract the belt partially. A clicking noise should be heard as the belt retracts indicating that the retractor
is in the Automatic Locking Retractors (ALR) mode.
3. Grasp the seat belt and try to pull out the retractor. The belt must lock and not extend any further. If NG,
replace the retractor assembly.
4. Allow the entire length of the belt to retract to cancel the automatic locking mode.
ELR Function Moving Check
NBRS0029S0303
WARNING:
Perform the following test in a safe, open area clear of other vehicles and obstructions (for example,
a large, empty parking lot). Road surface must be paved and dry. DO NOT perform the following test
on wet or gravel roads or on public streets and highways. This could result in an accident and seri-
ous personal injury. The driver and passenger must be prepared to brace themselves in the event the
retractor does not lock.
1. Fasten driver’s seat belt. Buckle a passenger into the seat for the belt that is to be tested.
2. Proceed to the designated safe area.
3. Drive the vehicle at approximately 16 km/h (10 MPH). Notify any passengers of a pending sudden stop
and the driver and passenger must be prepared to brace themselves in the event the retractor does not
lock, apply brakes firmly and make a very hard stop.
During stop, seat belts should lock and not be extended. If the seat belt retractor assembly does not lock,
perform the retractor off-vehicle check.
SEAT BELT RETRACTOR OFF-VEHICLE CHECK
NBRS0029S04
1. Remove the seat belt retractor assembly.
2. Slowly pull out belt while tilting the retractor assembly forward from the mounted position without twisting
the retractor assembly as shown in the illustration.
15 degrees or less tilt: Belt can be pulled out.
35 degrees or more tilt: Belt locks and cannot be pulled out.
SEAT BELTS
Seat Belt Inspection (Cont’d)
RS-8
SRS361
If NG, replace the retractor assembly.
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SEAT BELTS
Seat Belt Inspection (Cont’d)
RS-9
Precautions
SUPPLEMENTAL RESTRAINT SYSTEM (SRS) “AIR BAG” AND “SEAT BELT
PRE-TENSIONER”
NBRS0005
The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER” 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:
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For 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.
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For 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:
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To 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.
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Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system.
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Do 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 “AIR BAG” AND “SEAT BELT PRE-TENSIONER” SERVICE
NBRS0006
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Do not use electrical test equipment to check SRS circuits unless instructed to in this Service Manual.
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Before servicing the SRS, turn ignition switch “OFF”, 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.
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Diagnosis sensor unit must always be installed with their arrow marks “
g
” 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.
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The 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.
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Handle 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.
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Conduct self-diagnosis to check entire SRS for proper function after replacing any components.
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After air bag inflates, the front instrument panel assembly should be replaced if damaged.
WIRING DIAGRAMS AND TROUBLE DIAGNOSIS
NBRS0007
When you read wiring diagrams, refer to the following:
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GI-11, “HOW TO READ WIRING DIAGRAMS”
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EL-9, “POWER SUPPLY ROUTING” for power distribution circuit
When you perform trouble diagnosis, refer to the following:
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GI-35, “HOW TO FOLLOW TEST GROUPS IN TROUBLE DIAGNOSES”
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GI-24, “HOW TO PERFORM EFFICIENT DIAGNOSIS FOR AN ELECTRICAL INCIDENT”
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
Precautions
RS-10
Preparation
SPECIAL SERVICE TOOLS
=NBRS0008
The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.
Tool number
(Kent-Moore No.)
Tool name
Description
KV99106400
(J38381)
Deployment tool
NT357
Disposing of air bag module
KV991065S0
(J38381-30)
Deployment tool adapters
NT762
* Deployment tool adapters for seat belt
pre-tesioner and for passenger air bag
module with black connector are not nec-
essary for servicing INFINITI QX4.
KV99105300
(J41246)
Air bag module bracket
NT354
Anchoring air bag module
HT61961000 and
HT62152000 combined
(J38219)
*Special torx bit
NT361
Use for special bolts [TAMPER RESIS-
TANT 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)
KV99109000
(J44230)
Deployment tool adapter for
built-in side air bags
NT827
KV99108200
(J38381-50 )
Deployment tool adapter for seat
belt pre-tensioner
NT721
*: Special tool or commercial equivalent
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
Preparation
RS-11
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