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 the relay

Many electric chains incorporate the relay. If the consumer joins manually, relay receives the order to bring food to the consumer. It is possible to bring food to the consumer directly from the rechargeable battery. At the considerable consumed currents the chain turns on the relay not to overload the switch. Along with the relay of inclusion there are also functional relays, for example the windshield cleaner washer relay.

Check of the relay of inclusion

At inclusion of the corresponding consumer the signal on the relay is given. At the same time electric current of management, influencing the electromagnetic coil, closes a contour of working current, providing the consumer's food.

It is the simplest to check operability of the relay, having replaced it with another, serviceable. So for example, arrive on HUNDRED. In the absence of the spare relay it is recommended to make check as follows. The designations of plugs given below can differ from available.


1. Take out the relay from the holder.
2. Include ignition and the corresponding switch.
3. By means of the device for control of tension check whether there is tension on the plug 30 (+) holder of the relay. For this purpose attach the device to weight(s), and carefully enter other tip of the device into the plug 30. If the light-emitting diode of the device lights up, tension is. If the device shows lack of tension, check according to the scheme whether there is no break on the way from a positive pole (+) rechargeable battery to the plug 30.
4. Prepare a crossing point from the isolated wire with the smoothed-out ends.
5. Connect a crossing point the plug 30 in the holder of the relay (+ rechargeable battery, always gives tension) to an exit of the closing contact of the relay (plug 37). Thereby operation of the serviceable relay is imitated. Where there are plugs in the holder of the relay, it is specified the relay.
6. If at the included crossing point the consumer works, it is possible to draw a conclusion on malfunction of the relay.
7. If the consumer does not work, find out, whether as it should be connection of weight to the consumer. Then check connection from the plug 87 to the consumer. At break eliminate malfunction.
8. If it is necessary, insert the new relay.

If malfunction appears periodically, then, as a rule, relay is the reason. In this case adhesion of contacts can take place. In this case slightly strike with a finger the relay case. If the relay at the same time works, replace it.