Examination
The connecting contacts of the relay are standardized. When the consumer is turned on, the relay is controlled. This means that by applying a closing current to terminal 68, the closing circuit to terminal 85 is closed. The magnetic coil inside the relay draws in the core and closes the current circuit "Operating current". "Operating current" goes from terminal 30 through the relay and terminal 87 further to the consumer.
The easiest way to check the operability of the relay is by replacing it with a new serviceable one. This is how it is done in the service station. Since the amateur does not always have the right relay at hand, the following working methods are recommended for handling the switching relay, which, among other things, are used to turn on headlights and fog lights. The terminal designations given here may differ, and above all, from serially installed relays.
1. Pull relay out of socket.
2. Turn on the ignition and the appropriate switch.
3. First check the presence of voltage at terminal 30 with a voltage indicator (+) in the relay socket. To do this, connect the indicator to ground (-), carefully attach the second wire to terminal 30 in the relay socket. If the indicator diode lights up, there is voltage. If the indicator does not show voltage, determine an open in the circuit from the positive pole of the battery (+) to terminal 30 according to the wiring diagram.
4. Make a jumper from an insulated wire, exposing its ends.
5. Connect this jumper in the socket terminal 30 (+) battery, always energized) with the relay switch output terminal 87. This technique does the same thing that a good relay would do if it were installed.
6. If, for example, the main beam lights up with the jumper installed, the relay is faulty.
7. If the high beam does not come on, find out if there is a ground connection to the headlight. Then, using the wiring diagram, find an open in the wire from terminal 87 to the headlight and repair.
8. Replace relay if necessary.
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