Infiniti QX4. Electrical System (2003 year). Manual — part 1
Supplemental Restraint System (SRS) “AIR
BAG” and “SEAT BELT PRE-TENSIONER”
NBEL0001
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:
쐌
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.
쐌
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:
쐌
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.
쐌
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.
쐌
Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harness connec-
tor (and by yellow harness protector or yellow insulation tape before the harness connectors).
Wiring Diagrams and Trouble Diagnosis
NBEL0002
When you read wiring diagrams, refer to the following:
쐌
GI-12, “HOW TO READ WIRING DIAGRAMS”
쐌
EL-10, “POWER SUPPLY ROUTING” for power distribution circuit
When you perform trouble diagnosis, refer to the following:
쐌
GI-36, “HOW TO FOLLOW TEST GROUPS IN TROUBLE DIAGNOSES”
쐌
GI-25, “HOW TO PERFORM EFFICIENT DIAGNOSIS FOR AN ELECTRICAL INCIDENT”
Check for any Service bulletins before servicing the vehicle.
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PRECAUTIONS
Supplemental Restraint System (SRS) “AIR BAG” and “SEAT BELT PRE-TENSIONER”
EL-5
Description
NBEL0003
HARNESS CONNECTOR (TAB-LOCKING TYPE)
NBEL0003S01
쐌
The tab-locking type connectors help prevent accidental looseness or disconnection.
쐌
The tab-locking type connectors are disconnected by pushing or lifting the locking tab(s). Refer to the
illustration below.
Refer to the next page for description of the slide-locking type connector.
CAUTION:
Do not pull the harness when disconnecting the connector.
[Example]
SEL769D
HARNESS CONNECTOR
Description
EL-6
HARNESS CONNECTOR (SLIDE-LOCKING TYPE)
=NBEL0003S02
쐌
A new style slide-locking type connector is used on certain systems and components, especially those
related to OBD.
쐌
The slide-locking type connectors help prevent incomplete locking and accidental looseness or disconnec-
tion.
쐌
The slide-locking type connectors are disconnected by pushing or pulling the slider. Refer to the illustra-
tion below.
CAUTION:
쐌
Do not pull the harness or wires when disconnecting the connector.
쐌
Be careful not to damage the connector support bracket when disconnecting the connector.
[Example]
SEL769V
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HARNESS CONNECTOR
Description (Cont’d)
EL-7
Description
NBEL0004
NORMAL OPEN, NORMAL CLOSED AND MIXED TYPE RELAYS
NBEL0004S01
Relays can mainly be divided into three types: normal open, normal closed and mixed type relays.
SEL881H
TYPE OF STANDARDIZED RELAYS
NBEL0004S02
1M
1 Make
2M
2 Make
1T
1 Transfer
1M·1B
1 Make 1 Break
SEL882H
STANDARDIZED RELAY
Description
EL-8
GEL264
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STANDARDIZED RELAY
Description (Cont’d)
EL-9
Schematic
NBEL0247
MEL274Q
POWER SUPPLY ROUTING
Schematic
EL-10
Wiring Diagram — POWER —
NBEL0248
BATTERY POWER SUPPLY — IGNITION SW. IN ANY POSITION
NBEL0248S01
MEL275Q
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POWER SUPPLY ROUTING
Wiring Diagram — POWER —
EL-11
MEL276Q
POWER SUPPLY ROUTING
Wiring Diagram — POWER — (Cont’d)
EL-12
MEL277Q
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POWER SUPPLY ROUTING
Wiring Diagram — POWER — (Cont’d)
EL-13
ACCESSORY POWER SUPPLY — IGNITION SW. IN “ACC” OR “ON”
NBEL0248S02
MEL278Q
POWER SUPPLY ROUTING
Wiring Diagram — POWER — (Cont’d)
EL-14
IGNITION POWER SUPPLY — IGNITION SW. IN “ON” AND/OR “START”
NBEL0248S03
MEL439O
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POWER SUPPLY ROUTING
Wiring Diagram — POWER — (Cont’d)
EL-15
MEL440O
POWER SUPPLY ROUTING
Wiring Diagram — POWER — (Cont’d)
EL-16
CEL083
Inspection
NBEL0249
FUSE
NBEL0249S01
쐌
If fuse is blown, be sure to eliminate cause of problem
before installing new fuse.
쐌
Use fuse of specified rating. Never use fuse of more than
specified rating.
쐌
Do not partially install fuse; always insert it into fuse
holder properly.
쐌
Remove fuse for “ELECTRICAL PARTS (BAT)” if vehicle is
not used for a long period of time.
SEL802Y
FUSIBLE LINK
NBEL0249S02
A melted fusible link can be detected either by visual inspection or
by feeling with finger tip. If its condition is questionable, use circuit
tester or test lamp.
CAUTION:
쐌
If fusible link should melt, it is possible that critical circuit
(power supply or large current carrying circuit) is shorted.
In such a case, carefully check and eliminate cause of
problem.
쐌
Never wrap outside of fusible link with vinyl tape. Impor-
tant: Never let fusible link touch any other wiring harness,
vinyl or rubber parts.
SEL109W
CIRCUIT BREAKER (PTC THERMISTOR TYPE)
NBEL0249S03
The PTC thermister generates heat in response to current flow.
The temperature (and resistance) of the thermister element varies
with current flow. Excessive current flow will cause the element’s
temperature to rise. When the temperature reaches a specified
level, the electrical resistance will rise sharply to control the circuit
current.
Reduced current flow will cause the element to cool. Resistance
falls accordingly and normal circuit current flow is allowed to
resume.
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POWER SUPPLY ROUTING
Inspection
EL-17
Ground Distribution
NBEL0250
MAIN HARNESS
NBEL0250S01
MEL390Q
GROUND
Ground Distribution
EL-18
MEL391Q
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GROUND
Ground Distribution (Cont’d)
EL-19
MEL392Q
GROUND
Ground Distribution (Cont’d)
EL-20
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