A car relay is a remote control switch that controls electrical components. To see how you should test yours, check your owners manual.
Simply swap it with another like relay.
The quickest & easiest way to test a relay is by substitution. It can be bench tested using wires and a test lamp.
Remove it and bench test it or bring to auto parts store they can test it for you
Some bench test them with an oscilliscope.
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Swap the relay with another like relay.
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To test a power steering relay, first locate the relay in the vehicle's fuse box or relay panel. Use a multimeter to check for continuity by removing the relay and testing the terminals; there should be continuity when the relay is energized. You can also swap the relay with a known good one to see if the power steering system starts functioning. If the relay fails the continuity test or the swap does not resolve the issue, it may need to be replaced.
First, check for resistance on the relay. If you get no resistance when you test it with a digital multimeter, the relay needs to be replaced. If that isn't the cause, you'll have to pull the starter off and have it bench tested (this is a free service at places such as Auto Zone, NAPA, etc.). If that doesn't solve it, then you need to check your electrical connections. If that doesn't solve it, you need to test the ignition switch.
To test the main relay in a 2004 Acura MDX, first locate the relay in the under-hood fuse box. Remove the relay and use a multimeter to check for continuity between the terminals; it should show continuity when activated. Additionally, you can apply 12 volts directly to the relay terminals to see if it clicks and operates properly. If it fails either test, replace the relay.
You can test a relay with and without a 9 volt battery. If you apply 9 volts to it and it's sufficient to turn on the relay, the NO switch will close and then have continuity with common. If you don't apply voltage, the NO switch will be open and not have continuity with common. You can use these continuity and resistance checks to test a relay to see if it works.