Transmission Control Switch (TCS)
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 transmission control switch (TCS) is a momentary contact switch that is located on the selector lever. Pushing the TCS will either disengage or engage the overdrive function of the automatic transmission. If OVERDRIVE is disengaged, the word O/D OFF will illuminate on the instrument cluster and forward gears 1 through 4 are available. The overdrive cancel feature resets after the ignition switch cycled.