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Your Vehicle electrical system control module controls the head lights on and off signals.This wouldnt be the switch itself at fault as this would usually time out with the key off and turn off your lights and if they are staying on all of the time with the switch off this can lead to the vehicle electrical system control module at fault.You would want to have the signals checked to help verify this which requires a compatible scan tool to monitor the control module signals to pinpoint for sure that it needs replaced.
If replaced it does need programmed by a dealer in order to operate in your model properly.
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