BMW 3 of the E46 series

since 1998 release

Repair and operation of the car

BMW 3 of the E46 series
+ BMW 3 Cars (E46)
+ Current leaving and service
+ Engine
+ Cooling systems, heating
+ Power supply systems, injection and release
+ Electric equipment of the engine
+ RKPP and transmission line
+ Automatic transmission
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
- Onboard electric equipment
   - Dignostika of electric elements
      Diagnostics of malfunctions of onboard electric equipment - the general information
      Safety locks - the general information
      Replacement of safety locks
      Fusible inserts - the general information
      Chain breakers (thermal relays) - the general information
      The relay - the general information
      Check of the electric motor of a screen wiper
      Check of a stoplight
      Check of the warmed back glass
      Removal and installation of the sensor of temperature
   + Lighting and alarm system
   + Devices and equipment
+ Schemes of electric equipment

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Safety locks - the general information


Protection of electric contours of the car is provided with application of a combination of safety locks, breakers of a chain and fusible inserts. It is easy to distinguish the burned-down safety lock from its transparent plastic case, serviceable by survey. Attentively examine a safety lock regarding identification of its burn-out. If the safety lock externally looks normally, but suspicions on its malfunction remained, make check of conductivity between the knife plugs acting from its case.

When replacing safety locks watch compliance replaceable old on type. The safety locks calculated on various current can externally look identical therefore the special attention should be paid to marking. Replacement of the burned-down safety lock on calculated on smaller - and especially big - current is undesirable. Each electric contour needs different extent of protection. Watch that marking on the case of a safety lock corresponded to the current on which the corresponding contour is calculated.

If the replaced safety lock immediately fuses, it is not reasonable to continue its replacement. Before it is necessary to reveal and eliminate the reason of its knocking-out. In most cases that appears the short circuit of an electrical wiring of a contour caused by break or damage of isolation of a wire.