Rotary Position Switch
WARNING: This page is about a different car, the 2002 Jaguar XK8 and 2001 Jaguar XK8. However, it is still accessible from the selected car via links, so may be relevant.
The rotary position switch detects the position of the transmission selector shaft. The switch is supplied as part of a new transmission assembly, mounted on the transmission body. The switch is used to indicate to the TCM the six positions of the shaft: Park, Reverse, Neutral, Drive, Third and Second. The switch provides a four-bit input to the TCM.