What is circuit 1 failure on Jag 1989 XJ6 thanks?

I have a 1988 Jag XJ6 that presented a "Circuit 1 Failure" on the dashboard. The cause of the problem was found to be a blown fuse in the passenger side fuse box. I replaced the fuse and the error message went away. "Circuit 1" refers to the fuse box located behind the right-front passenger side kick panel. "Circuit 2 failure" would indicate a problem in the fuse box located behind the driver's kick panel. Lastly, a "Circuit 3 failure" message would indicate a problem in the fuse box located in the center console. I hope that helps! - Keith