There's an X circuit connection in the headlamp switch, but I think that the b circuit at fuse 5 does a better job.
The X circuit does not work on the "Lock" position, only back to "Off". The X circuit is off when the key is in the "Lock" position.
The B circuit is the one that's still live when the key is turned all the way to "Lock". It only goes off when you remove the key.