99 diagram supercharger

Could be one of two things. First is the brake light switch, located of course at the brake pedal under the dash. But usually if the brake lights work it is fine. Second there is a solenoid inside the console at the shifter. Look to the right of the shifter, there should be a slot there. Insert a key and push down to release the shifter. This solenoid is part of the shifter, so to replace it you have to replace the whole shifter, Runs from $150 to $200