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My name is ***** ***** I am a professional here at Just Answer. I noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.
Some models use a retained accessory power relay to turn on and off these lights and this relay or module can fail and cause this here.I have also seen issues with shorted wiring causing this fault needing repaired.If anything electrical has been done on the vehicle recently I would have this re checked for any issues needing repaired.
If wiring is all o.k. the light control circuit will have to be tested to pinpoint and repair the cause here.
Unfortunately my info isn't showing me where this relay is located.Usually on most it is under the hood with the fuses and relays.
This may be a short in wiring causing this here.If you can I would have the wiring checked to the lights to see if any shorts or wiring damage is found.
Your welcome.Let me know if you need anything else and feel free to rate my help above if you like.