When it comes to testing a Toyota AC relay, there are a few things that you will need to do in order to get accurate results. First, you will need to locate the relay within the AC system. Once you have found the relay, you will need to remove it from the system and test it using an ohmmeter. When testing the relay, you should first check for continuity between the two terminals on the bottom of the relay. If there is continuity, then the relay is good. However, if there is no continuity, then the relay needs to be replaced.