Transmission Control Switch
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2004 Ford RV Cutaway, 2004 Ford Pickup, 2004 Ford F550 Super Duty, 2004 Ford F450 Super Duty, and 2004 Ford Excursion. However, it is still accessible from the selected car via links, so may be relevant.
On automatic transmission equipped vehicles, the transmission control switch provides an input signal to the PCM whenever the switch is pressed. For F-SuperDuty/Excursion, the tow/haul indicator will illuminate when the transmission control switch is cycled to engage and disengage the tow/haul strategy. For E-Series, the overdrive cancel indicator will illuminate when the transmission control switch is cycled to engage or disengage the overdrive function of the transmission. For additional information and diagnostics, refer to the appropriate TRANSMISSION article.