Transmission Control Switch
WARNING: This page does not describe the selected car, but rather 31 other vehicles, including the 2003 Mercury Sable, 2003 Mercury Mountaineer, 2003 Mercury Marauder, 2003 Mercury Grand Marquis, and 2003 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.
Transmission Control Switch (TCS) may also be referred to as overdrive (O/D) cancel switch. The TCS signals the PCM with keypower whenever the TCS is pressed. TCS position is controlled by vehicle operator. If overdrive is disengaged, O/D OFF indicator located on instrument panel, or Transmission Control Indicator Light (TCIL) located on shift lever, will illuminate.