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Network Message Chart

WARNING: This page is about a different car, the 2017 Lincoln Navigator and 2017 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.

Trailer Module (TRM) Network Message Chart 

Broadcast Message Originating Module Message Purpose
Turn signal switch status BCM Indicates to the Trailer Module (TRM) the turn signal position on the LH steering column multifunction switch (left/right lane change or turn signal on or off) to the BCM.
Brake Lamp On Status BCM Indicates to the Trailer Module (TRM) that he BCM is commanding the stoplamp outputs on.
Parklamp status BCM Indicates to the Trailer Module (TRM) that he BCM is commanding the parking lamp outputs on.
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