BCM Interface With Remote Function Actuation (RFA) System

The Remote Function Actuation (RFA) system interacts with the UTD system (part of the BCM operation) in the following ways:
- RFA system sends a UNLOCK (passive or active) message on the serial data line to the Body Control Module (BCM).
- Upon receiving a UNLOCK message from the RFA system, the BCM turns the courtesy lamps ON (if ambient light is low) and disarms the UTD system.
- Upon receiving an LOCK message on the serial data line from RFA system, the BCM turns the courtesy lamps OFF, and momentarily sounds the horn and/or flashes the lights (depending on selected personalize options) to indicate security system arming.