Keyless Entry Rear Antenna
WARNING: This page is about a different car, the 2018 Ford EcoSport. However, it is still accessible from the selected car via links, so may be relevant.
For information on the keyless entry rear antenna, Refer to: Passive Anti-Theft System (PATS) - System Operation and Component Description .
The keyless entry rear antenna is wired to the BCM. When activated, it transmits a low frequency signal to activate a passive key.