E39 series BMW 5

since 1996-2001 of release

Repair and car operation

+ Introduction
+ Maintenance instruction
+ Current leaving and service
+ Engine
+ Systems of cooling, heating
+ Power supply system and release
+ engine Electric equipment
+ Manual transmission
+ Automatic transmission
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
- Onboard electric equipment
   Diagnostics of malfunctions of onboard electric equipment - the general information
   Safety locks
   Fusible inserts
   Chain breakers (thermal relays)
   Relay check
   Check of filament lamps
   Check of electric motors
   Check of electric switches
   Check of switches of lamps and electric motors
   Check of sensors
   Check of the electric motor of a screen wiper
   Stoplight check
   Check of a heater of back glass
   Removal and switch installation
   Removal and installation of the sensor of temperature
   Removal, installation and check of a sound signal
   Initialization of remote control by the uniform lock
   Adjustment of range of light of headlights
   Removal and installation of the electric motor of adjustment of range of light
   Replacement of safety locks
   Arrangement of safety locks
   Lighting devices
   Replacement of filament lamps
   Removal and headlight installation
   Adjustment of headlights
   Removal and installation of a back lamp
   Removal and installation of the block of the dashboard
   Replacement of lamps of the block of the dashboard
   Removal and installation of the switch of signals of a turn/screen wiper
   Removal and radio receiver installation
   Screen wiper
   Replacement of brushes of a screen wiper
   Removal, installation and adjustment snuffled a stekloomyvatel
   Removal and installation of a drive of a screen wiper/cover
   Removal and installation of the electric motor of a screen wiper
   Check and replacement of the pump of a stekloomyvatel
   Work with electric circuits
+ electric equipment Schemes
+ System of onboard diagnostics

Check of electric motors

In the car there are many devices and the comfort devices which drive is carried out from small servomotors. Window regulators, the movable panel of the hatch of a roof, the uniform lock belong to such devices, for example. Turning on of electric motors is carried out via switches, in most cases manually.


1. Check a safety lock of the corresponding electric motor. If necessary replace it.

Electric motors of window regulators and drive of the movable panel of a roof have the safety machine gun which is switched off at an overload and after a while joins again. Before repeated turning on of the device it is necessary to eliminate the overload reason. The icing of glass or pollution directing glasses can be the reasons.

2. If the safety lock fuses at once, there is a short circuit.
3. To find out, whether the electric motor is damaged, attach to it two cables from the storage battery. A positive cable of the battery to positive contact of the electric motor, negative respectively to the negative.
Polarity can be determined by an electric circuit. There can be a need for electric motor removal. The supply voltage of all electric motors after removal the electric motor works at 12 — 14 V.Esli's car, malfunction was in a food.

With interruptions wear of brushes can be the reason of decrease in angular speed of the electric motor or its work. In this case it is necessary to replace brushes.

4. Check operation of the electric motor by means of the electroscheme. Check connection, a food wire.
5. Check a control lamp tension existence on a current carrying cable of the electric motor. The electric motor has a big consumed current. Therefore it is possible to apply the ordinary filament lamp to check. Such control lamp has usual tips with which it is possible to pierce a connecting cable. Thus it is possible to check tension existence rather simply.

Connecting plugs of the electric motor have the following designations:
The plug 32 — weight connection
The plug 33 — positive contact

Reversive electric motors, for example elktrodvigatel of window regulators, have two positive accessions. There are following designations:
The plug 33L — connection of the left rotation
The plug of 33 R — connection of the right rotation

The electric motor of a screen wiper has special designation of contacts, see appropriate section.

6. If tension on the electric motor is not present, the reason can be in a food wire. It is necessary to check a food wire according to the scheme. In a consequence of a big current electric motors have, as a rule, the additional relay of inclusion, see appropriate section
7. If malfunction was not found, check the switch.
8. If any cable is damaged, it is meaningful to replace it.