Enable Relay Tests
When the power consumer is turned on, the operating current flows to it through the relay. The easiest way to test the relay is to replace it with a known good one. But there is not always an extra relay, so the following method is proposed for the on relay and fog lights.
Remove the relay from the block.
Turn on the ignition and the corresponding switch.
Check with a tester for voltage at the positive terminal. If the probe lamp is on, it means that voltage is present.
Otherwise, find an open in the electrical circuit between the battery and the terminal.
From an insulated wire, make a jumper, exposing the ends, connect the jumper on the relay block to the positive battery terminal with the relay output contact, which achieves the effect, as if a replacement with a known-good relay was carried out. The location of the terminals on the turnip block is determined by the color of the wires or by the electrical diagram.
If the high beam headlights come on with a jumper, the relay is faulty.
If high beam fails, check headlight ground connection. Then, using the electrical diagram, find and repair the wire break.
Install a new relay if necessary.