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BMW 5 Series E39since 1996-2001 releaseRepair and operation of the car |
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BMW E39 + 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) Relay 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 Monitors 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 |
Diagnostics of malfunctions of onboard electric equipment - the general information The electric component, various switches, the relay, electric motors, safety locks, fusible inserts or breakers of a contour concerning this component and also the conducting and electric sockets serving for connection of a component with the battery and mass of a body can be a part of a typical electric contour. For simplification of a problem of search of malfunctions of electric contours at the end of the Management schematic diagrams of electric connections are enclosed. Before starting works on elimination of malfunctions any of electric contours, attentively study the corresponding scheme as much as possible to have a clear view of its functional purpose. Narrowing of a circle of troubleshooting is usually run due to gradual identification and an exception of normally functioning components of the same contour. At simultaneous failure at once of several components or contours burn-out of the corresponding safety lock or violation of grounding is the most probable cause of refusal (different contours in many cases can become isolated on one safety lock or the plug of grounding). Failures of electric equipment often are explained by the elementary reasons, such as corrosion of plugs, failure of a safety lock, combustion of a fusible insert or defect of the relay of switching. Make visual check of a condition of all safety locks, conducting and electric sockets of a contour before starting more concrete check of serviceability of its components. In case of application for troubleshooting of diagnostic units carefully plan according to the enclosed electric circuits in what points of a contour and in what sequence it is necessary to connect the device for the purpose of the most effective detection of defect. The tester of electric chains or the voltmeter (12 V a control lamp with a set of connecting wires can be also used), the contour piece continuity indicator (sampler) including a bulb, own power supply and a set of connecting wires are among the main diagnostic units. Besides, it is always necessary to have in the car a set of the wires for start of the engine from an auxiliary source equipped with clips like crocodile and, it is desirable, the contour breaker which can be applied to shunting and connection of various components of electric equipment in the course of diagnostics of a contour. As it was already mentioned above before starting check of a chain by means of the diagnostic equipment, determine by schemes of the place of its connection. Verification of tension Verifications of tension are made in case of violation of functioning of a contour.
Detection of lack of tension speaks about existence of malfunction between this point of a contour and the last from checked earlier (where tension was present). In most cases weakening of electric connections and violation of quality of contacts is a cause of failure.
Searches of short circuit One of methods of searches of short circuit is extraction of a safety lock and connection instead of it of a lamp sampler or the voltmeter. Tension in a contour has to be absent. Pull conducting, watching a lamp sampler. If the lamp begins to blink, somewhere in this plait there is a short circuit on weight which is perhaps caused by wiping of isolation of a wire. Similar check can be made for each of contour components, including switches. Check of serviceability of grounding This check is made for the purpose of definition of reliability of grounding of a component.
If the lamp lights up, grounding as it should be (and vice versa). Conductivity verifications Check is made for the purpose of identification of breaks of an electric chain.
At transfer of the switch to situation "Vkl" the control lamp sampler has to light up. Break localization At diagnostics of the break of a contour suspected on existence visually to find a cause of defect it appears quite difficult as survey of plugs on existence of corrosion or violation of quality of their contacts is complicated in a type of limitation of access to them (usually plugs are closed by the socket case). Sharp or a plait of its wires in many cases leads twitchings of the case of the socket on the sensor to conductivity restoration. Do not forget about it in attempts of localization of a cause of failure of the contour suspected on break. Unstably arising refusals can have the reason oxidation of plugs or violation of quality of contacts. Diagnostics of malfunctions of electric chains does not represent a stubborn task on condition of a clear idea that current arrives to all electric loadings (a lamp, an electric motor, etc.) from the battery on wires via switches, the relay, safety locks, fusible inserts at all, and then comes back to the battery through the mass of the car. Any problems connected with failure of electric equipment can have the reason only interruptions in supply on them electric current from the battery or its return to it. |
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