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E46 (1998-2006) E46 (1998-2006, petrol) E36 (1990-2000) E30 (1982-1994) E21 (1975-1983)
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Basic information and precautions (BMW 3 Series E46)

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Warning! Before performing any work on the electrical system, read the warnings given in paragraph "Safety first!" at the beginning of this Guide and in chapter 5.


The electrical system has a voltage of 12 V with a negative wire on the ground. As a power source for lighting devices and all electrical equipment of the car, an acid battery with lead plates is used, recharged by the generator.

This chapter describes the repair and maintenance of various electrical devices and systems not related to the engine. Information regarding the battery, ignition system, generator and engine starter is contained in chapter 5A.

To prevent short circuits and/or fire, disconnect the negative battery terminal before working on any electrical component (see chapter 5A).

This article is available at russian, bulgarian, belarusian, ukrainian, serbian, croatian, romanian, polish, slovak, hungarian
Article verified: Ilyinsky Matvey

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БМВ E46: Equipment and devices
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BMW E46 (1998-2006) 
  • General information
  • Manual
  • Maintenance
  • Power unit
  • Engine repair
  • Cooling system
  • Power system (gasoline)
  • Injection system (gasoline)
  • Fuel system (diesel)
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  • Ignition system
  • Charge and launch systems
  • Transmission
  • Car gearbox
  • Clutch and drive shafts
  • Chassis
  • Brake system
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  • Steering
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  • Body care and repair
  • Exterior
  • Interior
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  • Troubleshooting
  • Lighting and signaling
  • Equipment and devices
  • Heater and air conditioner
  • Electrical circuits
BMW E46 (1998-2006, petrol) 
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  • Power unit
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BMW E36 (1990-2000) 
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  • Supply system
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  • Power devices
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BMW E30 (1982-1994) 
  • Power unit
  • M10/M20 engine
  • M40 engine
  • Ignition system
  • Lubrication system
  • Cooling system
  • Supply system
  • Fuel injection
  • Exhaust system
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  • Clutch
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  • Front axle
  • Rear axle
  • Chassis
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  • Heating system
  • Equipment and devices
  • Electrical circuits
BMW E21 (1975-1983) 
  • General information
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  • 4-cylinder engine
  • Engine repair
  • Cooling and lubrication system
  • Supply system
  • Ignition system
  • 6-cylinder engine
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  • Supply system
  • Fuel injection system
  • Ignition system
  • Transmission
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  • Automatic gearbox
  • Cardan and rear axle
  • Chassis
  • Steering
  • Front suspension
  • Rear suspension
  • Brake system
  • Electrical equipment
  • Equipment and devices
  • Electrical circuits
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