Transmission Control Indicator Light
WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2002 Mercury Sable, 2002 Mercury Mountaineer, 2002 Mercury Grand Marquis, 2002 Mercury Cougar, and 2002 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.
Transmission Control Indicator Light (TCIL) is an output signal from PCM that controls indicator light on/off function depending on engagement or disengagement of overdrive. See TRANSMISSION CONTROL SWITCH under INPUT DEVICES.