1995 LAND ROVER DISCOVERY Workshop Manual

75SUPPLEMENTARY RESTRAINT SYSTEM
4
REPAIR Refit
9.Reverse removal procedure.
CAUTION: Ensure road wheels are straight
ahead before fitting steering wheel.
10.Fit steering wheel ensuring the rotary coupler
lugs are correctly engaged.
11.Fit steering wheel nut. Tighten to
50 Nm (37 lbf
ft).
12.Refit driver's airbag module.See driver's
airbag module.
ROTARY COUPLER
Service repair no - 76.74.07
CAUTION: Ensure wheels are straight
ahead before removal and refitting. Store
in plastic bag. DO NOT rotate mechanism
whilst removing.
Remove
1.Remove driver's airbag module.
See driver's
airbag module.
2.Remove steering wheel.See steering wheel.
3.Release lever and lower steering column.
4.Release 2 turnbuckles and remove lower dash
panel.

SUPPLEMENTARY RESTRAINT SYSTEM
5
REPAIR
5.Remove 3 screws securing lower half of nacelle
to steering column.
6.Separate the 2 halves of the nacelle and remove
from steering column.
7.Release airbag harness connector from bracket
and disconnect.
8.Disconnect rotary coupler connector from
steering column harness.
9.Release 2 clips securing rotary coupler to
column switch assembly.
10.Remove rotary coupler from column switch
assembly.

75SUPPLEMENTARY RESTRAINT SYSTEM
6
REPAIR
11.If rotary coupler is being re-used, place a piece
of adhesive tape around moulding in positionA
to prevent rotation.
Refit
12.Reverse removal procedure.
CAUTION: Ensure indicator cancellation
pegs correctly engage into back of
steering wheel.13.Align direction indicator cancellation bush. If
original rotary coupler is being fitted remove
adhesive tape and then fit rotary coupler to
column switch assembly.
NOTE: If original rotary coupler is to be
fitted and there is evidence of tampering, it
is imperative that the coupler is
centralised.
See rotary coupler centralise.
14.If a new rotary coupler is being fitted and the
sealing tape at positionBis broken it MUST
NOT be used.
15.Refit steering wheel.
See steering wheel.
16.Turn steering wheel to both LH and RH lock 5
times. If adverse noises can be heard, check
alignment of indicator cancellation pegs.
17.Refit driver's airbag module.
See driver's
airbag module.

SUPPLEMENTARY RESTRAINT SYSTEM
7
REPAIR ROTARY COUPLER CENTRALISE
Fitting a rotary coupler which has not been centralised
could result in tape breakage. If the tape is broken, a
new rotary coupler must be fitted.
Providing the removal procedure has been correctly
followed this operation should not be necessary. If
however there is evidence of tampering, it is
imperative that the coupler is centralised.
CAUTION: Ensure wheels are positioned
straight ahead before fitting the rotary
coupler.
1.Correctly fit rotary coupler to column switch
assembly but do not fit steering wheel or make
any electrical connections.
See rotary coupler.
2.Depress rotary coupler locking peg and without
using undue force, rotate coupler anti-clockwise
as far as inner tape will allow. Releasing peg will
lock coupler in its current position.
NOTE: Do not apply excessive force when
limit is reached as this may result in tape
breakage. If no limit can be found, tape
has already broken and rotary coupler must be
replaced.
3.Having turned rotary coupler fully anti-clockwise
to limit position, proceed to turn coupler 2.5 turns
clockwise to obtain central position. (Coupler will
normally rotate a full five turns from
anti-clockwise limit to clockwise limit).
4.Make necessary electrical connections and refit
steering wheel.
See steering wheel.
5.Refit driver's airbag module.See driver's
airbag module.
COLUMN SWITCH ASSEMBLY
Service repair no - Indicator/lighting - 86.65.55
Service repair no - Wash/wipe - 84.15.34
Remove
1.Remove steering wheel.
See steering wheel.
2.Release 2 turnbuckles and remove lower dash
panel.

75SUPPLEMENTARY RESTRAINT SYSTEM
8
REPAIR
3.Remove 3 screws securing lower half of nacelle
to steering column.
4.Separate the halves of the nacelle and remove
from steering column.
5.Release 2 clips securing rotary coupler to
column switch assembly.
6.Release rotary coupler.
CAUTION: Do not allow rotary coupler to
hang on its harness.
7.Disconnect 4 connectors from column switch
assembly.
8.Remove column switch assembly from steering
column.
Refit
9.Reverse removal procedure.

SUPPLEMENTARY RESTRAINT SYSTEM
9
REPAIR PASSENGER'S AIRBAG MODULE
Service repair no - 76.74.02
WARNING: All the airbag system
components, including the wiring harness,
MUST be renewed after the airbags have
deployed.
Remove
1.Switch off ignition.
2.Disconnect battery negative lead and then
positive lead.
3.Open glovebox and disconnect harness
connector from airbag module.
4.Use special socket and long extension, remove
2 torx head screws securing front of airbag
module to fascia panel.
5.Use special socket, remove 2 torx head screws
securing rear of airbag module to fascia panel.
6.Release airbag module from fascia panel.
CAUTION: Do not allow the airbag module
to hang by the airbag harness.
7.Carefully and without pulling on connector
remove airbag module.
CAUTION: Store the airbag module in
accordance with the storage procedures
described in Description and Operation.
NOTE: If airbag module is to be replaced
the serial number must be recorded in the
vehicle service record.
Refit
8.Reverse removal procedure.
9.Tighten airbag module securing screws to
8Nm
(6 lbf ft).
CAUTION: Take care not to cross thread
screws.
10.Check Supplementary Restraint System using
Testbook.

75SUPPLEMENTARY RESTRAINT SYSTEM
10
REPAIR CRASH SENSOR - DISTRIBUTED SRS
Service repair no - 76.74.04
Remove
1.Disconnect battery negative lead.
2. LH sensor only:Slacken power steering
reservoir clamp and lift reservoir to provide
access.
Diesel model only:Remove jack and mounting
bracket.
3.Disconnect multiplug from sensor
CAUTION: Ensure airbag harness
connector seal and anti-backout DO NOT
come adrift when disconnecting sensor.
4.Use special socket, remove 2 screws securing
crash sensor to body.
5.Remove crash sensor.Refit
6.Reverse removal procedure.
7.Tighten crash sensor securing screws to
10 Nm
(7 lbf ft).
Ensure multiplug is fully engaged on
sensor and retained by its latch.
8.Check Supplementary Restraint System using
Testbook.

SUPPLEMENTARY RESTRAINT SYSTEM
11
REPAIR AIRBAG DIAGNOSTIC CONTROL UNIT -
DISTRIBUTED SRS
Service repair no - 76.74.03
Remove
1.Disconnect battery negative lead.
2.Remove centre console assembly.
See
CHASSIS AND BODY, Repair, centre
console.
3.Remove 4 screws and release the 2 rear
passenger air ducts from their fitted position and
remove centre console mounting bracket.
4.Use flat ended screwdriver and release
YELLOW retainer, pull retainer 30mm (1 1/8 in)
from multiplug and disconnect airbag harness
multiplug from airbag control unit.
5.Use special socket, remove 2 screws securing
airbag control unit to body bracket.
6.Remove airbag diagnostic control unit.
Refit
7.Reverse removal procedure.
8.Tighten control unit securing screws to
10Nm (7
lbf ft).
9.Check Supplementary Restraint System using
Testbook.