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Trailer Stop-Turn Lamps

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.

When the BCM receives a request for a turn signal, the BCM sends a turn indicator command message over the HS-CAN to the Trailer Module (TRM) to activate the requested stop/turn indicator output to the trailer tow connector.

The Trailer Module (TRM) receives a stoplamp activation message from the BCM over the HS-CAN when the BCM receives input from the stoplamp switch indicating that the brake pedal is pressed and the Trailer Module (TRM) activates both stop/turn indicator outputs to the trailer tow connector.

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