BMW 5 series E39

Since 1996-2001 of release

Repair and car operation

+ Introduction
+ The maintenance instruction
+ Current leaving and service
+ The engine
+ Systems of cooling, heating
+ The 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 an onboard electric equipment - the general information
   Safety locks
   Fusible inserts
   Chain breakers (thermal relays)
   The relay
   Relay check
   Check of lamps накаливания
   Check of electric motors
   Check of electric switches
   Check of switches of lamps and electric motors
   Check of gauges
   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 gauge of temperature
   Removal, installation and check of a sound signal
   Remote control initialization 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
   Illumination devices
   Replacement of lamps накаливания
   Removal and headlight installation
   Adjustment of headlights
   Removal and installation of a back lantern
   Removal and installation of the block of the panel of devices
   Replacement of lamps of the block of the panel of devices
   Removal and installation of the switch of signals of turn/screen wiper
   Removal and radio receiver installation
   Screen wiper
   Replacement of brushes of a screen wiper
   Removal, installation and adjustment snuffled стеклоомывателя
   Removal and installation of a drive of a screen wiper/cover
   Removal and installation of the electric motor of a screen wiper
   Check and pump replacement стеклоомывателя
   Work with electric schemes
+ Electric equipment schemes
+ System of onboard diagnostics

Relay check

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

Check of the relay of inclusion

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

Most easier to check up working capacity 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. Resulted below a designation of plugs can differ from the available.


1. Take out the relay from the holder.
2. Include ignition and the corresponding switch.
3. By means of the device for the pressure control check up, whether there is a pressure on the plug 30 (+) the holder of the relay. For this purpose attach the device to weight (-), and other tip of the device cautiously enter into the plug 30. If the device light-emitting diode lights up, pressure is. If the device shows absence of pressure, check up under the scheme, whether there is breakage on a way from a positive pole (+) no storage battery to the plug 30.
4. Prepare a crosspiece from the isolated wire with the smoothed out ends.
5. Connect a crosspiece the plug 30 in the holder of the relay (+ the storage battery, always submits pressure) with an exit of closing contact of the relay (the plug 37). Thereby work of the serviceable relay is simulated. Where there are plugs in the holder of the relay, is specified in the relay.
6. If at the included crosspiece 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 weight connection to the consumer is perfectly in order. Then check up connection from the plug 87 to the consumer. At breakage eliminate malfunction.
8. If it is necessary, insert the new relay.

If malfunction appears periodically the reason, as a rule, is the relay. In this case can take place слипание contacts. In this case slightly strike a finger on the relay case. If the relay thus works, replace it.