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Home >> Ford >> 2014 >> Expedition XL, 4WD >> Repair and Diagnosis (Single Page) >> Brakes >> Brakes Control Systems >> Auxiliary Brake System >> Description And Operation >> Auxiliary Brake System - Trailer Brake Control (TBC) Module >> System Operation >> Network Message Chart >> Trailer Brake Control (TBC) Module Wake Up
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Trailer Brake Control (TBC) Module Wake Up

NOTE: These conditions require that a trailer not  be connected to the trailer tow connector.

The following conditions describe the normal operation of the TBC  module at start up.

When the ignition key is in the RUN position and the manual lever is set all the way to the left with a gain of 10, the message center should display TRAILER DISCONNECTED. At the same time, with the vehicle stationary, battery voltage should be present at pin 3 of trailer tow connector.

When not braking the TBC  module sends a voltage pulse every 4 seconds to pin 3 of the trailer tow connector to determine if a trailer is connected to the trailer tow connector.

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