2001 INFINITI QX4 ECU

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

SBF266H
Deployment Tool CheckNBRS0018S0102Press the deployment tool switch to the ªONº position. The left side
lamp in the tool, marked ªair bag connector voltageº should illumi-
nate. If it does not illuminate, replace the tool.
Air Bag Deployment Tool Lamp Illumination Chart
(Battery connected)
NBRS0018S0103
Switch operationLeft side lamp, green*
ªAIR BAG CONNECTOR
VOLTAGEºRight side lamp, green*
ªDEPLOYMENT TOOL
POWERº
OFF OFF ON
ON ON ON
*: If this lamp glows red, the tool is connected to the battery incorrectly. Reverse
the connections and make sure the lamp glows green.
SRS144-E
SRS142-E
DEPLOYMENT PROCEDURES FOR AIR BAG MODULE
(OUTSIDE OF VEHICLE)
NBRS0018S02Unless the vehicle is being scrapped, deploying the air bag in the
vehicle is not recommended. This may cause damage to the
vehicle interior.
Anchor air bag module bracket [KV99105300 (J41246)] in a vise
secured to a firm foundation during deployment.
Deployment of Driver's Air Bag Module (Outside of
vehicle)
NBRS0018S02011. Make an 8.5 mm (0.335 in) diameter hole in air bag module
bracket [SST: KV99105300 (J41246)] at the position shown in
figure at left.
2. Using wire, secure air bag module to air bag module bracket
[SST: KV99105300 (J41246)] at two places.
CAUTION:
Use wire of at least 1 mm (0.04 in) diameter.
3. Firmly secure air bag module bracket [SST: KV99105300
(J41246)] with air bag module attached, in a vise.
SRS143-E
4. Connect deployment tool [SST: KV99106400 (J38381)] to air
bag module connector.
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
Disposal of Air Bag Module and Seat Belt Pre-tensioner (Cont'd)
RS-24

SRS020-B
5. Connect red clip of deployment tool to battery positive termi-
nal and black clip to negative terminal.
6. The lamp on the right side of the tool, marked ªdeployment tool
powerº, should glow green, not red.
7. Press the button on the deployment tool. The left side lamp on
the tool, marked ªair bag connector voltageº, will illuminate and
the air bag module will deploy.
CAUTION:
When deploying the air bag module, stand at least 5 m (16 ft)
away from the air bag module.
SRS141-G
Deployment of Passenger Air Bag Module (Outside of
vehicle)
NBRS0018S02021. Make an 8.5 mm (0.335 in) diameter hole in air bag module
bracket [SST: KV99105300 (J41246)] at the position shown in
figure at left.
SRS145-C
2. Firmly secure air bag module bracket [SST: KV99105300
(J41246)] in a vise.
SRS146-C
3. Match the two holes in air bag module bracket (held in vise)
and passenger air bag module and fix them with two bolts [M8
´25 - 30 mm (0.98 - 1.18 in)].
CAUTION:
If a gap exists between passenger air bag module and air bag
module bracket, use a piece of wood inserted in the gap to
stabilize the air bag module.
SRS147-A
4. Connect deployment tool adapter [SST: KV991065S0 (J38381-
30)] to deployment tool [SST: KV99106400 (J38381)] connec-
tor and air bag module connector.
5. Connect red clip of deployment tool to battery positive termi-
nal and black clip to negative terminal.
6. The lamp on the right side of the tool, marked ªdeployment tool
powerº, should glow green, not red.
7. Press the button on the deployment tool. The left side lamp on
the tool, marked ªair bag connector voltageº, will illuminate and
the air bag module will deploy.
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
BT
HA
SC
EL
IDX
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
Disposal of Air Bag Module and Seat Belt Pre-tensioner (Cont'd)
RS-25

SRS020-B
CAUTION:
IWhen deploying the air bag module, do not stand on the
deploying side.
IStand at least 5 m (16 ft) away from the air bag module.
SRS490-A
Deployment of Side Air Bag Module (Built-in type)
(Outside of vehicle)
NBRS0018S02031. Make 6.5 mm (0.256 in) diameter holes in air bag module
bracket [SST: KV99105300 (J41246)] at the position shown in
figure at left.
SRS628
2. Firmly secure air bag module bracket [SST: KV99105300
(J41246)] in a vise.
3. Insert the stud bolts of side air bag module (built-in type) into
the two holes in air bag module bracket (held in vise) and fix
them with two M6 nuts.
CAUTION:
Side air bag module should be secured to air bag module
bracket [SST: KV99105300 (J41246)] in a vise with metal por-
tion facing down.
SRS688
4. Connect deployment tool adapter [SST: KV99109000
(J44230)] to deployment tool [SST: KV99106400 (J38381)]
connector and connector on air bag module.
SRS020-B
5. Connect red clip of deployment tool to battery positive termi-
nal and black clip to negative terminal.
6. The lamp on the right side of the tool, marked ªdeployment tool
powerº, should glow green, not red.
7. Press the button on the deployment tool. The left side lamp on
the tool, marked ªair bag connector voltageº, will illuminate and
the air bag module will deploy.
CAUTION:
When deploying the air bag module, stand at least 5 m (16 ft)
away from the air bag module.
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
Disposal of Air Bag Module and Seat Belt Pre-tensioner (Cont'd)
RS-26

Trouble Diagnoses Introduction=NBRS0040CAUTION:
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.
IDo not attempt to repair, splice or modify the SRS wiring harness. If the harness is damaged,
replace it with a new one.
IKeep ground portion clean.
DIAGNOSIS FUNCTIONNBRS0040S01The SRS self-diagnosis results can be read by using ªAIR BAGº warning lamp and/or CONSULT-II. The read-
ing of these results is accomplished using one of two modes Ð ªUser modeº and ªDiagnosis modeº.
The User mode is exclusively prepared for the customer (driver). This mode warns the driver of a system
malfunction through the operation of the ªAIR BAGº warning lamp.
The Diagnosis mode allows the technician to locate and inspect the malfunctioning part.
The mode applications for the ªAIR BAGº warning lamp and CONSULT-II are as follows:
User mode Diagnosis mode Display type
ªAIR BAGº warning lamp X X ON-OFF operation
CONSULT-II Ð X Monitoring
NOTE:
Seat belt pre-tensioner malfunction is indicated by ªAIR BAGº warning lamp.
DIAGNOSIS MODE FOR CONSULT-IINBRS0040S02IªSELF-DIAG [CURRENT]º
A current Self-diagnosis result (also indicated by the number of warning lamp flashes in the Diagnosis
mode) is displayed on the CONSULT-II screen in real time. This refers to a malfunctioning part requiring
repairs.
IªSELF-DIAG [PAST]º
Diagnosis results previously stored in the memory are displayed on the CONSULT-II screen. The stored
results are not erased until memory erasing is executed.
IªTROUBLE DIAG RECORDº
With TROUBLE DIAG RECORD, diagnosis results previously erased by a reset operation can be displayed
on the CONSULT-II screen.
IªECU DISCRIMINATED NO.º
The diagnosis sensor unit for each vehicle model is assigned with its own, individual classification num-
ber. This number will be displayed on the CONSULT-II screen, as shown below. When replacing the diag-
nosis sensor unit, refer to the part number for the compatibility. After installation, replacement with a cor-
rect unit can be checked by confirming this classification number on the CONSULT-II screen.
SRS851
For INFINITI QX4, the diagnosis sensor unit classification numbers assigned is A540.
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
BT
HA
SC
EL
IDX
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
Trouble Diagnoses Introduction
RS-29

Part SRS is activated SRS is NOT activated
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. DamagedÐREPLACE damaged section of harness. Do not attempt to repair, splice or modify any SRS
harness.
Instrument panel 1. When passenger air bag inflates, check the following points for bending, deformities or cracks.
IOpening portion for passenger air bag
SRS366
IPassenger air bag module brackets
SRS367
IThe portions securing the instrument panel
SRS876
2. If no damage is found, reinstall the instrument panel.
3. If damagedÐREPLACE the instrument panel with bolts.
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
Collision Diagnosis (Cont'd)
RS-60

SRS266
2. Align spiral cable correctly when installing steering wheel.
a. Set the front wheels in the straight-ahead position.
b. 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.
SST818C
3. Remove steering wheel with Tool.
SST329C
4. Remove key interlock cable.
SST844C
STEERING COLUMNNBST0017S02IWhen installing steering column, fingertighten all lower bracket
and clamp retaining bolts; then tighten them securely. Do not
apply undue stress to steering column.
IWhen attaching coupling joint, be sure tightening bolt faces
cutout portion.
STEERING WHEEL AND STEERING COLUMN
Removal and Installation (Cont'd)
ST-12

in high-pressure connector. Take care to install the proper
O-ring.
SST616C
IInitially, tighten nut on tie-rod outer socket and knuckle arm to
64 to 69 N´m (6.5 to 7.0 kg-m, 47 to 51 ft-lb). Then tighten fur-
ther to align nut groove with first pin hole so that cotter pin can
be installed.
CAUTION:
Tightening torque must not exceed 108 N´m (11.0 kg-m, 80 ft-
lb).
SST819A
IBefore removing steering column lower joint from gear, set
gear in neutral (wheels in straight-ahead position). After
removing steering column lower joint, put matching mark on
pinion shaft and pinion housing to record neutral position.
ITo install, set left and right dust boots to equal deflection.
Attach steering column lower joint by aligning matching marks
of pinion shaft and pinion housing.
SST617C
ITighten gear housing mounting bracket bolts in the order
shown.
Secure tightening torque:
118 - 137 N´m (12 - 14 kg-m, 87 - 101 ft-lb)
SST718CA
DisassemblyNBST00281. Prior to disassembling, measure pinion rotating torque. Record
the pinion rotating torque as a reference.
IBefore measuring, disconnect cylinder tube and drain
fluid.
IUse soft jaws when holding steering gear housing. Handle
gear housing carefully, as it is made of aluminum. Do not
grip cylinder in a vise.
2. Remove pinion gear.
Be careful not to damage pinion gear when removing pinion
seal ring.
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
RS
BT
HA
SC
EL
IDX
POWER STEERING GEAR AND LINKAGE
Removal and Installation (Cont'd)
ST-19