BMW 5 Series E39

since 1996-2001 release

Repair and operation of the car

+ Introduction
+ Maintenance instruction
+ Current leaving and service
+ Engine
+ Cooling systems, 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)
   Check of the relay
   Check of glow 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
   Check of a stoplight
   Check of a heater of back glass
   Removal and installation of the switch
   Removal and installation of the sensor of temperature
   Removal, installation and check of a sound signal
   Initialization of remote control of 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 glow lamps
   Removal and installation of a headlight
   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 installation of the radio receiver
   Screen wiper
   Replacement of brushes of a screen wiper
   Removal, installation and adjustment snuffled windscreen washer
   Removal and installation of the drive of a screen wiper/cover
   Removal and installation of the electric motor of a screen wiper
   Check and replacement of the pump of windscreen washer
   Work with electric circuits
+ Schemes of electric equipment
+ System of onboard diagnostics


Check of electric motors

In the car there are many devices and comfort devices which drive is carried out from small servomotors. Window regulators, movable panel of the hatch of a roof, 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 the drive of the movable panel of a roof have the safety automatic machine which is switched off at an overload and after a while joins again. Before repeated turning on of the device it is necessary to remove the overload cause. Frosting of glass or pollution of guides of glass can be the reasons.

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

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

4. Check operation of the electric motor by means of the electrical circuitry. Check connection, food wire.
5. Check a control lamp presence of tension on a current carrying cable of the electric motor. The electric motor has the big consumed current. Therefore it is possible to use the ordinary glow lamp to check. Such control lamp has usual tips which it is possible to pierce a connecting cable. Thus it is possible rather just to check presence of tension.

Connecting plugs of the electric motor have the following designations:
The plug 32 — connection of weight
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 33 R — connection of the right rotation

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

6. If there is no tension on the electric motor, reason can be in a food wire. It is necessary to check a food wire according to the scheme. In the investigation of big current electric motors have, as a rule, additional relay of inclusion, see appropriate section
7. If malfunction was not found, check the switch.
8. If any cable is damaged, then it makes sense to replace it.