Transmission Range (TR) Sensor
WARNING: This page is about a different car, the 2008 Lincoln Navigator L and 2008 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.
The TCM uses the position of this switch, housed in the TCM, to determine the selected gear range from the range selector lever.
The sensor completes the start circuit in PARK and NEUTRAL, and the back-up lamp circuit in REVERSE. The sensor also opens/closes a set of switches that are monitored by the TCM to determine the position of the manual lever (P, R, N, D, 3, 2 and 1).