Next time CHECK SIDE LIGHT warning comes on...as tmv mentioned in the 2nd post...check all the front and side lights that come on with the parkiing lights...especially the AEs.

Now that you've written that when you got home the warning was gone...it points at one (or both) of the AEs going bad...they have a tendency to turn off/on when they begin to fail...especially if you have the original yellowish incandescent AEs.

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