My gap tool showed the following.

Adaptive headlights don’t dance don’t move and are stuck “cross-eyed”. showing “code u1a39-87 communications malfunction of right actuator - bus signal/message failure missing a message.” (Left light points right, right light points left.

I have tried researching solutions. Some say that it is a ground issue. At least one indicated that it was a software issue and that a dealers updates would resolve the problem.

Is there a way to test the ground on the headlight plug? If so. How? Electrical issues are not my strong suit.

By by the way, if you are using your gap tool for diagnostics be sure that you are using a backup power supply, ie a good charger. My battery went flat in about ten minutes while scanning and reading codes.

Thanks. Phil