Hello,

There is no relay, there is a controller that handles the job of the relay. Here are some air conditioner wiring diagrams (below) and a guide so you can see how the system is wired and how to do some testing.

https://www.2carpros.com/articles/how-to-check-wiring

and

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Please run some tests and get back to us so we can continue helping you.

Cheers, Ken