Good morning and thank you for inquiring with JustAnswer, my name is XXXXX XXXXX i will be the technician assisting you today. The first step you should check is to make sure you have power on the green/orange wire at the blower motor. If no power check fuse number 64. If power ok, check for a valid ground feed to the switch on the black wire, if ok, then in HI speed mode check for a valid ground signal to the blower motor on the black/orange wire. If no ground,replace the switch, if gound is ok on the black/orange wire then replace the blower motor. I have posted the wiring diagram for your refference below
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