Land Rover Body And Paint Air Bag And Safety Belt Rover Manual

							•RH side impact.
•Roll-over.
The front impact thresholds increase in severity from
pretensioners, through to driver and passenger air bag
stage 2, belt fastened.
Firing Strategies
The seat belt pretensioners are fired when either the
pretensioner impact limit or the roll-over limit is
exceeded. The restraints control module only fires the
pretensioners if the related safety belt is fastened. For
the front passenger pretensioner to fire, the seat must
also be occupied by a large person, i.e. someone over a
given weight (NAS only).
The driver and passenger air bags are only fired in a
frontal impact that exceeds the stage 1 threshold. Both
stages of the inflator in the driver and passenger air bags
are fired. At impacts between the stage 1 and 2
thresholds, the delay between the firing of the two stages
varies with the severity of the impact; the more severe
the impact the shorter the delay. At stage 2 impact
thresholds and above, the two stages of the inflator are
fired almost simultaneously. The passenger air bag is
disabled unless the front passenger seat is occupied by
a large person (NAS only), or the passenger air bag
deactivation switch is on (all except NAS). The time
delay between firing the two stages of the inflator in the
driver air bag is increased if the driver seat is forward
of the seat position sensor switching point.
If there is a fault with a safety belt buckle sensor, the
restraints control module assumes the related safety belt
is fastened for the pretensioner firing strategy and
unfastened for the driver and passenger air bag firing
strategies. If there is a fault with the occupant detection
system, or if there is a fault with the passenger air bag
deactivation switch, the restraints control module
increase the time delay between firing the two stages
of the inflator in the passenger air bag.
If a side impact limit is exceeded, the restraints control
module fires the side air bag and the side air curtain(s)
on that side of the vehicle. If the side impact limit on
the front passenger side of the vehicle is exceeded, the
restraints control module also evaluates the input from
the occupant classification system, and fires the side air
bag only if the front passenger seat is occupied by a
large person (NAS only).
The side air curtain(s) on both sides of the vehicle are
fired if the roll-over limit is exceeded.
If multiple impacts occur during a crash event, after
responding to the primary impact the restraints control
module will output the appropriate fire signals in
response to any further impacts if unfired units are
available.
Crash Signal
When the restraints control module outputs any of the
fire signals, it also outputs a hard wired crash signal to
the Engine Control Module (ECM) and changes the
high speed CAN bus output message from no crash to
crash condition. The high speed CAN bus message is
used by the Central Junction Box (CJB) and the Fuel
Fired Booster Heater (FFBH).
On receipt of the crash signals:
•The ECM disables the fuel pump.
•Operation of the FFBH is disabled.
•The CJB enters the crash mode and:
•Activates all of the unlock signals of the vehicle
locking system, even if the vehicle is already
unlocked. After 3 seconds, the CJB activates the
unlock signals again, in case a lock button is
pressed during the crash, by flailing limbs for
example.
•Ignores all locking and superlocking inputs until
the crash mode is cancelled, when it returns the
locking system to normal operation.
(G421346) Technical Training274
Lesson 3 – Body and PaintAir Bag and Safety Belt Pretensioner
Supplemental Restraint System (SRS) 
						

							•Activates all of the courtesy lamps, except for the
approach lamps. The activated courtesy lamps
remain on until they are manually switched off
at the lamp unit, or the CJB crash mode is
cancelled, when they return to normal operation.
•Activates the hazard warning lamps. The hazard
warning lamps remain on until cancelled by
turning the ignition switch from position II to
position I or 0, or until the crash mode is
cancelled.
The crash mode is cancelled by cycling the ignition
switch.
Air Bag and Safety Belt Pretensioner
Supplemental Restraint System (SRS)
Lesson 3 – Body and Paint
275Technical Training (G421346) 
						

							SRS CONTROL DIAGRAM - SHEET 1 OF 2 (ALL EXCEPT NAS)
NOTE: A = Hardwired connections; D = High speed CAN bus
(G421346) Technical Training276
Lesson 3 – Body and PaintAir Bag and Safety Belt Pretensioner
Supplemental Restraint System (SRS) 
						

							Fusible link 11E, battery junction box1
Battery2
Left front impact sensor3
Right front impact sensor4
Left side impact sensor5
Right side impact sensor6
Passenger air bag deactivation switch7
Left safety belt buckle sensor8
Instrument cluster9
Right safety belt buckle sensor10
Occupant detection pressure sensor11
Seat position sensor12
Restraints Control Module13
Fuse 9P, central junction box14
Ignition switch15
Fuse 68P, central junction box16
Passenger air bag deactivation indicator17
Air Bag and Safety Belt Pretensioner
Supplemental Restraint System (SRS)
Lesson 3 – Body and Paint
277Technical Training (G421346) 
						

							SRS CONTROL DIAGRAM - SHEET 1 OF 2 (NAS ONLY)
NOTE: A = Hardwired connections; D = High speed CAN bus
(G421346) Technical Training278
Lesson 3 – Body and PaintAir Bag and Safety Belt Pretensioner
Supplemental Restraint System (SRS) 
						

							Fusible link 11E, battery junction box1
Battery2
Left front impact sensor3
Right front impact sensor4
Left side impact sensor5
Right side impact sensor6
Left safety belt buckle switch7
Right safety belt buckle switch8
Instrument cluster9
Safety belt tension sensor10
Occupant classification module11
Pressure pad and sensor12
Seat position sensor13
Restraints Control Module14
Fuse 9P, central junction box15
Ignition switch16
Fuse 68P, central junction box17
Passenger air bag deactivation indicator18
Air Bag and Safety Belt Pretensioner
Supplemental Restraint System (SRS)
Lesson 3 – Body and Paint
279Technical Training (G421346) 
						

							SRS CONTROL DIAGRAM - SHEET 2 OF 2 (ALL MARKETS)
NOTE: A = Hardwired connections
(G421346) Technical Training280
Lesson 3 – Body and PaintAir Bag and Safety Belt Pretensioner
Supplemental Restraint System (SRS) 
						

							Passenger air bag1
Driver air bag2
Clockspring3
ECM4
Diagnostic socket5
Left pretensioner6
Left side air bag7
Left third row side air curtain8
Left first and second row side air curtain9
Right third row side air curtain10
Right first and second row side air curtain11
Restraints Control Module12
Right side air bag13
Right pretensioner14
Air Bag and Safety Belt Pretensioner
Supplemental Restraint System (SRS)
Lesson 3 – Body and Paint
281Technical Training (G421346) 
						

							COMPONENT LOCATIONS
Evaporator1
Thermostatic expansion valve2
Connections for auxiliary climate control (where
fitted)
3
Low pressure line4
A/C compressor5
Condenser6
Receiver drier7
High pressure line8
Low pressure servicing connection9
Refrigerant pressure sensor (reference)10
High pressure servicing connection11
Air ConditioningLesson 2 – Electrical
13Technical Training (G421234) 
						

							GENERAL
The Air Conditioning (A/C) system transfers heat from
the vehicle interior to the outside atmosphere to provide
the heater assembly with dehumidified cool air. The
system consists of:
•A compressor.
•A condenser.
•A receiver drier.
•A thermostatic expansion valve.
•An evaporator.
•Low and high pressure refrigerant lines.
The system is a sealed, closed loop, filled with a charge
weight of R134a refrigerant as the heat transfer medium.
Oil is added to the refrigerant to lubricate the internal
components of the compressor.
Operation of the air conditioning system is controlled
by the Automatic Temperature Control Module
(ATCM).
A/C COMPRESSOR
Pressure relief valve1
Outlet port2
Inlet port3
Solenoid valve4
Electrical connector5
Pulley6
(G421234) Technical Training14
Lesson 2 – ElectricalAir Conditioning