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Have you checked to see if any another are out?
Did the blown out bulb start working after replacement ? Also does the dash say anything about a AFS being out ?
Ok you more then likely have a AFS bulb that is out this bulb is located in the headlamp assembly they come on only when you make turns its used to help when turning , turn the truck on put the vehicle in drive and have someone check the lights while you turn the steering wheel at the way to each side each bulb should come on which ever side does not come on the bulb is bad very common issue . I hope this helps.
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