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 sensors

Treat sensors, in particular: oil pressure relay sensor, sensor of a reserve of brake and cooling liquid.


1. Attach a control lamp or an ohmmeter to switch plugs. For this purpose disconnect cables from the switch.

The switches screwed in the block of cylinders, as a rule, have no weight cable as connection with weight is carried out via the case.

2. At the closed switch the device has to give evidences. Best of all for this purpose to use an ohmmeter. At the closed switch the ohmmeter has to show zero Ohms at opened infinity of Ohms.
3. The easiest to check operability of sensors of a reserve of cooling liquid and brake fluid as follows. At the included ignition disconnect a wire from the switch and apply it to a reliable point of weight, for example to the block of cylinders. If the corresponding signaling device on dashboards, then malfunction in the switch lights up.
4. The special case represents the oil pressure relay sensor. At the idle engine the contact is closed (signaling device burns). The switch works only with a certain pressure of oil.