Infiniti QX4 (R50). Manual — part 539
Supplemental Restraint System (SRS) “AIR
BAG” and “SEAT BELT PRE-TENSIONER”
NBSC0001
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 system 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).
Information necessary to service the system safely is included in the RS section of this Service Manual.
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. For removal of Spiral Cable and Air
Bag Module, see the RS section.
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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.
Wiring Diagrams and Trouble Diagnosis
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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 GROUP IN TROUBLE DIAGNOSIS”
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GI-24, “HOW TO PERFORM EFFICIENT DIAGNOSIS FOR AN ELECTRICAL INCIDENT”
PRECAUTIONS
Supplemental Restraint System (SRS) “AIR BAG” and “SEAT BELT PRE-TENSIONER”
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Special Service Tool
NBSC0017
Tool number
Tool name
Description
J-44373 Model 620
Battery/Starting/Charging
system tester
SEL403X
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
EL
IDX
PREPARATION
Special Service Tool
SC-3
How to Handle Battery
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CAUTION:
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If it becomes necessary to start the engine with a booster
battery and jumper cables, use a 12-volt booster battery.
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After connecting battery cables, ensure that they are
tightly clamped to battery terminals for good contact.
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Never add distilled water through the hole used to check
specific gravity.
MEL040F
METHODS OF PREVENTING OVER-DISCHARGE
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The following precautions must be taken to prevent over-discharg-
ing a battery.
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The battery surface (particularly its top) should always be kept
clean and dry.
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The terminal connections should be clean and tight.
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At every routine maintenance, check the electrolyte level.
This also applies to batteries designated as “low maintenance”
and “maintenance-free”.
MEL041F
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When the vehicle is not going to be used over a long period of
time, disconnect the negative battery terminal. (If the vehicle
has an extended storage switch, turn it off.)
MEL042F
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Check the charge condition of the battery.
Periodically check the specific gravity of the electrolyte. Keep
a close check on charge condition to prevent over-discharge.
CHECKING ELECTROLYTE LEVEL
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WARNING:
Do not allow battery fluid to come in contact with skin, eyes,
fabrics, or painted surfaces. After touching a battery, do not
touch or rub your eyes until you have thoroughly washed your
hands. If acid contacts eyes, skin or clothing, immediately
flush with water for 15 minutes and seek medical attention.
BATTERY
How to Handle Battery
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MEL043F
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Remove the cell plug using a suitable tool.
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Add distilled water up to the MAX level.
SEL709E
Sulphation
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A battery will be completely discharged if it is left unattended
for a long time and the specific gravity will become less than
1.100. This may result in sulphation on the cell plates.
To determine if a battery has been “sulphated”, note its volt-
age and current when charging it. As shown in the figure, less
current and higher voltage are observed in the initial stage of
charging sulphated batteries.
A sulphated battery may sometimes be brought back into ser-
vice by means of a long, slow charge, 12 hours or more, fol-
lowed by a battery capacity test.
MEL042FA
SPECIFIC GRAVITY CHECK
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1.
Read hydrometer and thermometer indications at eye level.
2.
Use the chart below to correct your hydrometer reading
according to electrolyte temperature.
Hydrometer Temperature Correction
NBSC0003S0301
Battery electrolyte temperature °C (°F)
Add to specific gravity reading
71 (160)
0.032
66 (150)
0.028
60 (140)
0.024
54 (130)
0.020
49 (120)
0.016
43 (110)
0.012
38 (100)
0.008
32 (90)
0.004
27 (80)
0
21 (70)
−0.004
16 (60)
−0.008
10 (50)
−0.012
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
EL
IDX
BATTERY
How to Handle Battery (Cont’d)
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