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BMW 3 series E30Since 1983-1994 of releaseRepair and car operation |
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BMW E30 + 1. The maintenance instruction + 2. Maintenance service + 3. The engine + 4. Cooling system + 5. Heating and ventilation + 6. Fuel system + 7. An exhaust system + 8. Transmissions + 9. Coupling + 10. Brake system + 11. A running gear + 12. A body - 13. An electric equipment 13.1.2. Search of malfunctions 13.1.3. Safety locks 13.1.4. The relay 13.1.5. The breaker of indexes of turn / of the alarm system 13.1.6. Switches on a steering column 13.1.7. The ignition lock 13.1.8. The receiver 13.1.9. The aerial 13.1.10. A guard of devices 13.1.11. Payment SI (the maintenance service index) 13.1.12. Headlights – replacement of lamps 13.1.13. Adjustment of headlights 13.1.14. The headlight case 13.1.15. Replacement of lamps 13.1.16. The screen wiper electric motor 13.1.17. A heater of back glass 13.1.18. Safety pillows 13.1.19. Cruise-control system 13.1.20. The central locking system 13.1.21. Electric window raiser + 13.2. Electroschemes + 14. A good advice |
13.1.2. Search of malfunctions
The structure of electric chains of the car includes the consumer, switches, the relay and the wires connected under the applied scheme. Before starting troubleshooting it is necessary to study the scheme and to define a possible source of malfunction. For example, the troubleshooting problem is considerably facilitated, if it will be possible to check up serviceability of other consumers expressly or by implication connected to the suspected chain. If refusal of several consumers most a plausible reason is breakage of connection with weight or blowing a safety lock is observed. As a rule electric equipment refusals are caused by easing of contacts or their corrosion, blowingм a safety lock or оплавлением crosspieces. Search of malfunctions as a rule is carried out by means of a tester (voltmeter) or a control lamp which are connected between a site of a faulty chain and well smoothed out site of weight. For check of reliability of connection with weight connect through an ohmmeter (or through a control lamp to a battery) checked connection of a wire with weight and well smoothed out site of weight. If the ohmmeter shows a chain (or the lamp will light up), connection with weight the reliable. Otherwise contact to weight is broken. Keep in mind that in most cases the weight serves the return токопроводом, connecting a chain with a negative pole of the battery. Therefore infringement of connection with weight, or rupture in a chain of a return current on the battery, can be a refusal principal cause. The prevention
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