Land Rover Defender: Supplemental Restraint System (SRS) Precautions
WARNING:
Do not install rear facing child seats in the front passenger seat.
The SRS contains components which are potentially hazardous to service
personnel if not handled correctly. The
following guidelines and precautions are intended to alert personnel to
potential sources of danger and emphasise the
importance of ensuring the integrity of the SRS components installed to the
vehicle.
WARNING:
The following precautions MUST be adhered to when working on the SRS:
- The correct procedures must always be used when working on SRS
components.
- Persons working on the SRS must be fully trained and have been issued
with the safety guidelines.
- The air bag modules contain extremely flammable and hazardous
compounds. Contact with water, acids
or heavy metals may produce harmful or explosive results. Do not dismantle,
incinerate or bring into
contact with electricity before the unit has been deployed.
- Always replace a safety belt assembly that has withstood the strain
of a severe vehicle impact or if the
webbing shows signs of fraying.
- Allow a period of 1 minute to elapse after disconnecting the battery
before undertaking any work on the
SRS.
- Always disconnect the vehicle battery before carrying out any
electric welding on a vehicle installed with
SRS.
CAUTION:
Do not expose air bag modules or safety belt pre-tensioners to temperatures
exceeding 85º C (185º F).
It should be noted that these precautions are not restricted to operations
performed when servicing the SRS. The
same care should be exercised when working on ancillary systems and components
located in the vicinity of SRS
components; these include but are not limited to:
- Driver air bag, clockspring.
- Passenger air bag.
- Side Air Curtains - front and rear.
- Safety belt pre-tensioners.
- SRS harnesses, link leads and connectors.
Making the system safe
Before working on or in the vicinity of SRS components, make sure the system
is rendered safe by performing the
following operations:
- Remove the ignition key.
- Disconnect the battery, earth lead first.
- Wait 1 minute for the SRS power circuit to discharge before commencing
work.
NOTE:
The SRS uses energy reserve capacitors to keep the system active in the event of
electrical supply failure
under crash conditions. It is necessary to allow the capacitors sufficient time
to discharge (1 minute) in order
to avoid the risk of accidental deployment.
Installation
In order to make sure system integrity, it is essential that the SRS system
is regularly checked and maintained so that
it is ready for effective operation in the event of a collision. Carefully
inspect SRS components before installation. Do
not install a part that shows signs of being dropped or improperly handled, such
as dents, cracks or deformation.
WARNING:
The integrity of the SRS is critical for safety reasons. Make sure the following
precautions are always
adhered to:
CAUTIONS:
- Take care not to trap air bag modules when installing interior trim
components.
- Make sure SRS components are not contaminated by oil or grease.
NOTES:
- Following safety belt pre-tensioner deployment, the safety belts can
still be used as conventional safety
belts but will need to be replaced as soon as possible to make sure full SRS
protection.
- If the SRS components are to be replaced, the part number/bar code of
the new unit must be recorded.
SRS component testing precautions
The SRS components are triggered using relatively low operating currents,
always adhere to the following:
WARNING:
Never use a multimeter or other general purpose equipment on SRS components. Use
only Jaguar Land
Rover diagnostic equipment to diagnose system faults.
WARNING:
Do not use electrical test equipment on the SRS harness while it is connected to
any of the SRS
components, it may cause accidental deployment and injury.
Handling and storage
Always observe the following precautions when handling SRS components:
- Never drop an SRS component. The air bag diagnostic control unit is a
particularly shock sensitive device and
must be handled with extreme care. Air bag modules and safety belt pre-tensioners
could deploy if subjected to a
strong shock.
- Never wrap your arms around an air bag module. If a module has to be
carried, hold it by the cover with the cover
uppermost and the base away from your body.
- Never transport air bag modules or safety belt pre-tensioners in the
passenger compartment of a vehicle. Always
use the luggage compartment of the vehicle for carrying air bag modules and
safety belt pre-tensioner units.
- Never attach anything to an air bag cover or any trim component covering
an air bag module. Do not allow
anything to rest on top of an air bag module.
- Always keep components cool, dry and free from contamination.
- Never apply grease or cleaning solvents to safety belt pre-tensioner
units, component failure could result.
- Always store an air bag module with the deployment side uppermost. If it
is stored deployment side down,
accidental deployment will propel the air bag module with sufficient force
to cause serious injury.
- Keep new air bag modules in their original packaging until just prior to
installation. Place the old module in the
empty packaging for carriage.
WARNINGS:
- When handling any SRS component, hold by the gas generator housing,
DO NOT hold by the air bag. Do
not wrap the thumb around the gas generator while holding. Do not drape air
bag over shoulder or around
neck. For safety belt buckle type pre-tensioners, hold by the piston tube,
with the open end of the piston
tube pointing towards the ground and the buckle facing away from your body.
Do not cover the end of the
piston tube. DO NOT hold buckle type pre-tensioners by the bracket assembly
or cable. Never point the
piston tube towards your body or other people.
- Air bag modules and safety belt pre-tensioners are classed as
explosive devices. For overnight and longer
term storage, they must be stored in a secure steel cabinet which has been
approved as suitable for the
purpose and has been registered with the local authority.
- Store air bag modules or safety belt pre-tensioners in a designated
storage area. If there is no designated
storage area available, store in the locked luggage compartment of the
vehicle and inform the workshop
supervisor.
CAUTION:
Improper handling or storage can internally damage the air bag module making it
inoperative. If you suspect
the air bag module has been damaged, install a new module and refer to the
deployment/disposal
procedures for disposal of the damaged module.
SRS harness and connectors
Always observe the following precautions with regards to SRS system
electrical wiring:
- SRS firing circuit wiring may only be repaired using the approved repair
kit in accordance with the correct
instructions.
- Never install electrical equipment such as a mobile telephone, two-way
radio or in-car entertainment system in
such a way that it could generate electrical interference in the air bag
harness. Seek specialist advice when
installing such equipment.
NOTE:
SRS wiring can be identified by a special yellow outer sleeve protecting the
wires (black with yellow stripe
protective coverings are sometimes used).
WARNING:
Always make sure SRS wiring is routed correctly. Be careful to avoid trapping or
pinching the SRS wiring.
WARNING:
Do not leave the connectors hanging loose or allow SRS components to hang from
their harnesses. Look for
possible chafing points.
Impact sensors - inspection
After any degree of side or frontal body damage, inspect the impact sensors.
Replace a sensor if there is any sign of
damage.
CAUTION:
Take extra care when painting or carrying out bodywork repairs in the vicinity
of the impact sensors. Avoid
direct exposure of the impact sensors or link harnesses to heat guns, welding or
spraying equipment. Take
care not to damage sensor or harness when reinstalling components.
Clockspring
CAUTION:
Always follow the procedure for installing and checking the clockspring as
instructed in the SRS repairs
section. Comply with all safety and installation procedures to make sure the
system functions correctly.
Observe the following precautions:
- Do not unlock and rotate the clockspring when it is removed from the
vehicle.
- Do not turn the road wheels when the clockspring is removed from the
vehicle.
- Always make sure the clockspring is removed and installed in its
central position and with the front road wheels in
the straight ahead position - refer to SRS repair section for the correct
removal and installation procedure.
- If a new clockspring is being installed, make sure the locking tab
holding the spring's rotational position is not
broken; units with a broken locking tab must not be used.
READ NEXT:
WARNING:
During deployment parts of the air bag module become hot enough to burn you.
Wait 30 minutes after
deployment before touching the air bag module.
Deployment procedures and precautions as det
CAUTION:
If the front air bags are deployed, the following components must be replaced:
Driver air bag module
Passenger air bag module
Fly leads (where applicable) connecting front air bag modules
The A/C system contains fluids and components which could be potentially
hazardous to the service engineer or the
environment if not serviced and handled correctly. The following guidelines are
inte
SEE MORE:
REMOVAL AND INSTALLATION
PART(S)
REMOVAL
CAUTION:
Be prepared to collect escaping fluids.
Before disconnecting any components, make sure the area is clean and
free from foreign material. When
disconnected all openings must be sealed.
NOTE:
This procedure contains illustrations showing cert
REMOVAL AND INSTALLATION
REMOVAL
NOTES:
This procedure contains some variation in the illustrations depending
on the vehicle specification, but the
essential information is always correct.
This procedure contains illustrations showing certain components
removed to provide extra clarity.
The
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