When you installed the HID kit did it come with error-cancelling harnesses or something similar? If not, go back to the place you got them and ask for them. You can also search on other options that other people used here on the forum.

Others experienced varying problems:

Things like the fog lights flicker at startup, won't start-up until after several tries, dash lights flicker, get message saying to check the fog lights.

Usually the check side light message is related to the angel eyes on '04 plus models.