Checking lamp and motor switches
Remove the relevant switch.
Simple switches have only 2 wire connectors. In this case, the positive voltage (+) is always supplied to one socket, and after the switch is turned on, the positive voltage feeds the other socket. There are also switches with an increased number of connectors. According to the electrical diagram, you should find out which connectors in such switches should be energized.
Use a test lamp to check whether voltage is supplied to the supply connector of the switch. If the test lamp lights up, turn on the switch and check for voltage at its output connector. If there is voltage, it can be stated that the switch is working.
If there is no voltage on the supply connector of the switch, then there is a break in the current supply circuit. Check the current supply circuit according to the wiring diagram and lay a new wire if necessary.
Checking the sensors-switches
Such sensors-switches are, for example, sensors-switches for levels of brake fluid, engine oil and coolant.
Connect a breaker tester (test lamp or ohmmeter) to the inlet and outlet wires of the switch, for which one wire should be removed from the switch.
Attention: Switches that are screwed into the engine block, as a rule, do not have a ground wire, since this function is performed by the switch housing.
It is best to check with an ohmmeter: when the switch is on, it should show 0 Σ, and when it is off, it should show ∞ Σ.
Additionally, you should check the operation of the indicator lamp on the instrument panel: with the ignition on, remove the power wire from the switch and connect it to a reliable ground. The indicator lamp should light up.
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