Nissan Silvia. Manual — part 318
Precautions
SUPPLEMENTAL RESTRAINT SYSTEM (SRS) “AIR BAG”
NMRS0006
The Supplemental Restraint System such as “AIR BAG” 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 NISSAN MODEL S15 is as follows:
The Supplemental Restraint System consists of driver air bag module (located in the center of the steering
wheel), front passenger air bag module (located on the instrument panel on passenger side), a diagnosis
sensor unit, warning lamp, wiring harness and spiral cable.
WARNING:
I
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 should be per-
formed by an authorized NISSAN dealer.
I
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. SRS wiring harnesses can be identified with yellow harness connector.
PRECAUTIONS FOR SRS “AIR BAG”
NMRS0007
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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 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 front passenger air bag modules with the pad
side facing upward.
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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
NMRS0008
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-7, “POWER SUPPLY ROUTING” for power distribution circuit
When you perform trouble diagnosis, refer to the following:
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GI-31, “HOW TO FOLLOW TEST GROUPS IN TROUBLE DIAGNOSES”
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GI-20, “HOW TO PERFORM EFFICIENT DIAGNOSIS FOR AN ELECTRICAL INCIDENT”
GI
MA
EM
LC
EC
FE
CL
MT
AT
PD
AX
SU
BR
ST
BT
HA
SC
EL
IDX
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
Precautions
RS-7
Preparation
SPECIAL SERVICE TOOLS
=NMRS0009
Tool number
Tool name
Description
KV99106400
Deployment tool
NT357
Disposing of air bag module
KV99105300
Air bag module bracket
NT354
Anchoring air bag module
HT61961000 and
HT62152000 combined
*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)
KV99108300
Deployment tool adapter for front
passenger air bag
NT836
*: Special tool or commercial equivalent
COMMERCIAL SERVICE TOOL
NMRS0040
Tool name
Description
Tamper resistant torx
socket
NT757
Size: T30
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
Preparation
RS-8
SRS Configuration
=NMRS0010
The air bag deploys if the diagnosis sensor unit activates while the ignition switch is in the “ON” or “START”
position.
SRS922
SRS Component Parts Location
NMRS0011
SRS923
GI
MA
EM
LC
EC
FE
CL
MT
AT
PD
AX
SU
BR
ST
BT
HA
SC
EL
IDX
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
SRS Configuration
RS-9
SRS924
Maintenance Items
NMRS0012
CAUTION:
Do not use electrical test equipment to check SRS circuit.
1.
Check operation of “AIR BAG” warning lamp.
After turning ignition key to “ON” position, the warning lamp
illuminates. The “AIR BAG” warning lamp will go off after about
7 seconds if no malfunction is detected. If any of the following
warning lamp conditions occur, immediately check the air bag
system. Refer to RS-28 for details.
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The “AIR BAG” warning lamp does not illuminate when the
ignition switch is turned “ON”.
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The “AIR BAG” warning lamp does not go off about 7 seconds
after the ignition switch is turned “ON”.
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The “AIR BAG” warning lamp blinks after about 7 seconds after
the ignition switch is turned “ON”.
2.
Visually check SRS components.
1)
Diagnosis sensor unit
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Check diagnosis sensor unit and bracket for dents, cracks and
deformities.
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Check connectors for damage, and terminals for deformities.
2)
Air bag module and steering wheel
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Remove air bag module from steering wheel, instrument panel
or seatback. Check harness cover and connectors for damage,
terminals for deformities, and harness for binding.
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Install driver air bag module to steering wheel to check fit or
alignment with the wheel.
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Check steering wheel for excessive free play.
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Install front passenger air bag module to instrument panel to
check fit or alignment with the instrument panel.
3)
Spiral cable
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Check spiral cable for dents, cracks, or deformities.
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Check connectors and protective tape for damage.
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Check steering wheel for noise, binding or heavy operation.
4)
Main harness, body harness
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Check connectors for poor connections, damage, and termi-
nals for deformities.
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Check harnesses for binding, chafing or cut.
CAUTION:
Replace previously used special bolts and ground bolt with
new ones.
Diagnosis Sensor Unit
REMOVAL AND INSTALLATION
NMRS0013
CAUTION:
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Before servicing SRS, turn the ignition switch off, discon-
nect both battery cables and wait at least 3 minutes.
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The special bolts are coated with bonding agent while the
other bolt is for ground. Do not use old bolts after
removal; replace with new ones.
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Check diagnosis sensor unit for proper installation.
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Check diagnosis sensor unit to ensure it is free of
deformities, dents, cracks or rust. If they show any visible
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
Maintenance Items
RS-10
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