419-03B Collision Warning System	2013 - 2014 Fusion
Description and Operation	Procedure revision date: 11/20/2012

Collision Warning System - System Operation and Component Description

System Operation

System Diagram

Network Message Chart

Network Input Messages - ACM

Broadcast Message	Originating Module	Message Purpose
Instrument panel cluster chime	IPC	Data used to command a warning chime during possible collision event and audio mute so that the warning chime can be heard.

Network Input Messages - CCM

Broadcast Message	Originating Module	Message Purpose
HUD data	HUD module	Used for HUD module active, available and fault status.

Network Input Messages - HUD

Broadcast Message	Originating Module	Message Purpose
Forward collision warning HUD flash command	CCM	Flashes the HUD module LED array when commanded.
Ignition status	BCM	Used for ignition switch position input.

Network Input Messages - IPC

Broadcast Message	Originating Module	Message Purpose
Forward collision chime request	CCM	Data used to command warning chime during possible collision event. When this message is received, the IPC sends the audio mute message to the ACM .
Forward collision warning message request	CCM	Data used to command warning chime and messages during possible collision event.

Cruise Control Operation

The forward collision warning system works in conjunction with the adaptive cruise control system. During a possible collision event, the CCM commands:

the HUD to flash red warning Light Emitting Diodes (LEDs).
the IPC to activate a chime and commands.
ACM to mute audio volume

The forward collision warning system is activated when the vehicle is moving forward at a speed greater than 8 kmh (5 mph). The CCM determines the distance and relative speed of the vehicle that is in the path of travel, utilizing a radar sensor (integral to the CCM ) to detect other vehicles that are moving in the same direction. If the CCM determines that a collision is possible, the CCM commands the HUD module Light Emitting Diodes (LEDs) to flash and the IPC to chime.

The forward collision warning system and audible warning chime can be enabled and disabled through the message center display in the IPC . The system reverts to on each ignition cycle. The HUD module and/or chime activates briefly to confirm the last setting.

For vehicles with a base IPC , the sensitivity of detection is changed in the message center from a high sensitivity (<----->) to a low sensitivity (<->). For vehicles with an optional IPC , there are three levels of sensitivity detection (HIGH, NORMAL and LOW) that are changed in the message center display.

If a MyKey® restricted key is in use, the MyKey® turns on the forward collision warning and will not allow the MyKey® user to disable the audio or visual forward collision warning system. However, the MyKey® user is able to adjust the forward collision warning sensitivity.

When a system fault is detected with the forward collision warning system the message COLLISION WARNING NOT AVAILABLE, COLLISION WARNING NOT AVAILABLE SENSOR BLOCKED SEE MANUAL, or COLLISION WARNING MALFUNCTION is displayed in the IPC message center.

Component Description

CCM

The CCM contains a radar sensor unit that determines the distance and relative speed of the vehicle that is in the path of travel.

HUD

The HUD contains the red Light Emitting Diodes (LEDs) that warn the driver of a possible collision event when commanded by the CCM .

There are certain situations when the warning Light Emitting Diodes (LEDs) cannot be seen, such as strong sunlight or when wearing sunglasses. The HUD module has a temperature sensor circuit that is integral to the module that senses the temperature of the Light Emitting Diodes (LEDs) internal to the module. When a high passenger compartment temperature such as strong sunlight is sensed by the temperature sensor, the warning Light Emitting Diodes (LEDs) can be temporarily disengaged. If this occurs, only the audible warning chime is used. Warnings may not appear if the distance to the vehicle ahead is very small or if the steering wheel and pedal movements are large, for example, due to a very active driving style.