Subaru Legacy/Outback

1999-2003 of release

Repair and operation of the car



Subaru of Legasi, Autbek
+ Cars Subaru Legacy, Outback
+ Operation manual
+ Routine maintenance
+ Engine
+ Cooling systems, heating
+ Power supply system and release
+ Electric equipment of the engine
+ Manual box and differential
+ Automatic transmission
+ Coupling
+ Brake system
+ Suspension bracket and steering
+ Body
- Onboard electric equipment
   Specifications
   Search of causes of failures of electric equipment
   Safety locks - the general information
   Chain breakers - the general information
   The relay - the general information and check of serviceability of functioning
   Details of laying of an onboard electrical wiring
   System of additional safety (SRS) - the device and the principle of functioning
   Diagnostics of malfunctions of SRS
   Removal and installation of the SRS components
   Control system of speed (tempostat) - the device and the principle of functioning
   Check of serviceability of functioning of components and problem diagnostics of a tempostat
   Removal, check of a state and installation of components of a control system of speed
   Combination of devices - the general information and the principle of functioning of components
   Problem diagnostics of components of a combination of devices
   Removal, service and installation of a combination of devices, check of a condition of components
   Heating of back glass and rear-view mirrors - the general information, check of serviceability of functioning of components, recovery repair of a thermoelectric heating element
   Heating of brushes of screen wipers - the general information, check of serviceability of functioning of components, recovery repair of a thermoelectric heating element
   Removal, check of a state and installation of switches of management of functioning of the electric drive of regulators of window regulators
   The electric drive of rear-view mirrors - check of serviceability of functioning
   Removal check and installation of the switch of management of functioning of the electric drive of external rear-view mirrors
   Removal, check of a state and installation of the switch of management of functioning of the electric drive of the top hatch
   Removal, check of a state and installation of the combined understeering switches
   Check of serviceability of functioning of electric motors of the drive of screen wipers, removal, check and installation of the operating relay of a back screen wiper on the Legacy Station wagon/Outback models
   Check of the relay and switches of lighting and alarm devices
   Removal and installation of illuminants, replacement of lamps
   Removal, check of a state and installation of horns and switch of a horn
   Check of a state and replacement of contact group of the switch of ignition
   The uniform lock - the device, the principle of functioning, diagnostics of malfunctions
   Removal, check of a state and installation of components of the uniform lock
   System of an immobilization of the engine - the device, the principle of functioning, diagnostics of malfunctions
   Removal and installation of components of system of an immobilization of the engine
   Removal and installation of assembly of the radio receiver
   Removal and installation of loudspeakers
   Check of a state and recovery repair of the window antenna of the radio receiver
   Removal, installation and check of a condition of the antenna amplifier of the radio receiver
   Removal and installation of the lighter
   + Schemes of electric connections









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System of additional safety (SRS) - the device and the principle of functioning

Scheme arrangement of the SRS components

1 — the Forward sensor of the directed overloads
2 — the 7-contact socket of an electrical wiring of SRS of yellow color
3 — the 2-contact socket of an electrical wiring of SRS of yellow color
4 — the Module of a driver's frontal safety cushion
5 — the 12-contact socket of an electrical wiring of SRS of yellow color
6 — the Module of a passenger frontal safety cushion
7 — the Sensor of the directed overloads of lateral safety cushions

8 — the 4-contact socket of an electrical wiring of SRS of yellow color
9 — the Module of management of SRS
10 — the 28-contact socket of an electrical wiring of SRS of yellow color
11 — the 2-contact socket of an electrical wiring of SRS of blue color
12 — the Module of a driver's lateral safety cushion
13 — the 2-contact socket of an electrical wiring of SRS of yellow color (for an emergency natyazhitel of a seat belt)


General information

The system of additional safety (SRS) which basic elements are safety cushions and emergency natyazhitel of seat belts is included in the standard package of all models considered in the present manual. The system provides additional protection of the driver and forward passenger of the car at strong front and (at the corresponding complete set) lateral blows. In certain points of all cars equipped with SRS system the special information plates warning the owner and mechanics HUNDRED about need to observe the appropriate measures of precaution during operation and service of the vehicle fasten.

 

 

The scheme of an arrangement of the SRS components on the car is submitted on an illustration.

Safety cushions

Modules of frontal safety cushions are located in stupichny part of assembly of a steering wheel (a driver's pillow) and on the right under the car dashboard (a passenger pillow). Lateral safety cushions (at the corresponding complete set of the car) are built in in external sidewalls of backs of forward seats.

The control lamp of SRS/AIR BAG, spring contact drum of assembly of understeering switches, the module of management of SRS with the sensors which are built in in it by the central processor (CPU) both control and electric, individual sensors of the directed overloads of safety cushions and a connecting electrical wiring are among the other SRS components.


Principle of functioning of safety cushions

 

At a head-on collision which sufficiency of intensity the processor (CPU) forward sensors on pravlenny overloads, and also the control and electric sensors which are built in the module of management provide short circuit of a chain of activation of frontal safety cushions of the driver and forward passenger.

 Necessary condition for operation of modules of safety cushions is simultaneous short circuit of chains of both managements of SRS sensors which are built in the module.


Control sensors of lateral safety cushions are built in the corresponding sensors of the directed overloads and work at registration of the directed lateral overloads exceeding a certain value, - simultaneity of operation of the sensor of an overload and the control sensor, besides, is an indispensable condition of activation of a pillow.

 


Module of management of SRS

The module of management of SRS is located in forward part of the tunnel canal of the forward panel of a floor and provides giving of power supply to modules of safety cushions at the time of the collision causing rather strong directed overloads. Operation of system happens even in case of crash of the onboard battery.

A survey of a condition of the SRS components is carried out by the module at each start of the engine and is followed by short-term operation of the control lamp of "AIR BAG/SRS" which is built in in an instrument guard. In case of an exit any of knots out of operation the control lamp after implementation of start is not disconnected. Also operation of a control lamp during the movement testifies to malfunction in system, - in a similar situation the car should be driven away as soon as possible on car repair shop.


SRS sensors

Forward sensors of the directed overloads

Sensors are installed ahead of both forward wheel arches. Sensors have a pendular design which anchor knot at excess by the directed blow of some limit admissible value turns and provides short circuit of the corresponding electric chain.


Lateral sensors of the directed overloads

The principle of operation of lateral sensors of the directed overloads is similar described above for forward sensors.

Control and electric sensors


Control and electric sensors are built in the module of management of SRS, and also assemblies of both lateral sensors of the directed overloads.

The control sensor, as well as sensors of the directed overloads, has a pendular design and acts as a safety element at short circuit of the corresponding chain of SRS.

The electric sensor consists from sensitive to the directed overloads of a semiconductor element which resistance changes depending on intensity of blow. The sensor allows CPU to estimate intensity of the overloads arising at collision.


Modules of safety cushions

Design of modules of frontal safety cushions

1 — the Safety cushion
2 — the Gas generator
3 — the Cover
4 — the Gas generator
5 — the Bearing beam of a steering column

 


Activation of a pillow (ek) of safety happens on condition of simultaneous operation of the corresponding SRS sensors (see above). Short circuit of a chain of the module of a safety cushion leads to almost instant filling of the last with the nitrogen which is allocated as a result of combustion of powdery mix of azid of sodium with copper oxide. In case of failure of the onboard battery the system switches to food from the reserve source which is built in in the SRS module and providing autonomous power generation within about 20 more seconds. The design of modules of safety cushions is presented on illustrations.


Contact drum

The reel is installed between a steering column and a steering wheel and presents itself the sliding contact made the spiral of a flat cable vein twisted in the form. By means of a contact drum giving of food from a plait of an electrical wiring of a steering column to placed in a nave of a steering wheel (and therefore mobile) is provided to the module of a driver's safety cushion.


Connecting electrical wiring

Connecting wires of SRS can be easily distinguished from an other onboard electrical wiring on bright yellow color of isolation.

 Contact SRS sockets are painted in yellow, or blue colors (see the Section Diagnostics of Malfunctions of SRS).


Emergency natyazhitel of seat belts

 otsedura of removal/installation of emergency natyazhitel, and also order of their utilization are described in the Section Seat belts - the general information, check of a state, removal and installation, an order of utilization of not worked emergency natyazhitel.


Seat belts of both forward seats are equipped by automatic emergency natyazhitel which activation happens at the command of the module of management of SRS developed on the basis of the analysis of the data arriving from forward sensors of the directed overloads (on condition of short circuit of the built-in control sensors). The basis of a design of natyazhitel is made by the assemblies of the belts of returnable drums which are taking up tapes equipped with the built-in gas generators.


Design of an emergency natyazhitel of a seat belt

1 — the Seat belt
2 — the Returnable device
3 — the Leading-up levels

4 — the Shaft
5 — Gas
6 — the Torsion bar

At receipt of the corresponding team from the module of management of SRS gas generators of natyazhitel are activated and the weak point of seat belts instantly gets out returnable devices. At excess by load of a belt of some limit admissible value the torsion bar which is built in assembly of a natyazhitel is twisted, weakening thereby the impact made by a belt tape on a thorax of the fastened driver/passenger.

Upon completion of operation of an emergency natyazhitel the returnable drum remains is blocked and assembly of a seat belt is subject to replacement.

Precautionary measures

Check of a condition of SRS has to be made time of 10 years.

Dismantle and service of components of a steering column, the radio receiver and other components located near the dashboard demands observance of special precautionary measures as casual damage of an electrical wiring of SRS can lead to the unauthorized operation of safety cushions fraught with receiving severe injuries. It is easy to identify an electrical wiring of SRS on bright yellow coloring of isolation, - at all do not disunite its contact sockets and do not connect to them any electric diagnostic units.

 Before starting performance of any works near the SRS components in surely order disconnect system!

The module of a safety cushion removed from the car should be held the face from itself, - transfer assembly to a safe place and lay face up.

Do not try to perform measurement of resistance of the SRS components at all, - the energy developed by the internal power supply of an ohmmeter can quite enough for operation of gas generators!

Before using on the car any electronic equipment it is necessary to make surely shutdown of SRS (see below).

Do not throw out never the worked modules of safety cushions in garbage recipients at all, - advice on utilization of the SRS components can always be got at car repair shops.

Shutdown of SRS system

Make the following manipulations for shutdown of SRS:

a) Bring the operated car wheels into rectilinear situation, turn the ignition key in the situation LOCK and take it from the lock;
b) Switch off ignition;
c) Disconnect from the battery at first negative, then positive wires.

 If the stereosystem established on the car is equipped with a security code before disconnecting the battery make sure that have the correct combination for input of the audio system in action!

d) Before starting performance of any works, wait not less than 20 seconds during which there has to be a discharge of the condenser of the emergency SRS power supply.

Activation of SRS

For activation of system connect to the battery at first a positive wire, then - negative, turn the ignition key in situation and make sure of serviceability of operation of a control lamp of SRS.