Four Wheel Drive Selector Switch: Description and Operation

4x4 Low Switch

The 4x4 low switch provides a signal to the instrument cluster when 4x4 low is selected. This input is used to adjust the shift schedule. Using the standard corporate protocol (SCP) network (Excursion) or the controller area network (CAN) (F-Super Duty) the instrument cluster provides a four wheel drive (4WD) status signal to the PCM.