Transmission Mode Switch: Description and Operation

TRANSMISSION CONTROL SWITCH (TCS)

Typical Column-Shift Transmission Control Switch (TCS):

On automatic transmission equipped vehicles, the TCS provides an input signal to the PCM whenever the switch is pressed. For F-Super Duty, the tow/haul indicator illuminates when the TCS is cycled to engage and disengage the tow/haul strategy. For E-Series, the overdrive cancel indicator illuminates when the TCS is cycled to engage or disengage the overdrive function of the transmission.