Ford Explorer: Collision Warning and Collision Avoidance System / Description and Operation - Collision Warning and Collision Avoidance System - System Operation and Component Description

Ford Explorer 2020-2021 Service Manual / Electrical / Electronic Feature Group / Collision Warning and Collision Avoidance System / Description and Operation - Collision Warning and Collision Avoidance System - System Operation and Component Description

System Operation

ACC With Pre-Collision Assist


Item Description
1 ACM
2 RCM
3 CCM
4 IPC
5 BCM
6 GWM
7 ABS module
8 IPMA

Network Message Chart

  Network Input Messages - ACM


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

  Network Input Messages - IPC


Broadcast Message Originating Module Message Purpose
Collision avoidance and driver support camera status   IPMA Data used to command the pre-collision assist system fault status in the message center.
Collision avoidance and driver support chime status   CCM Data used to command a warning chime that a collision event is possible.
Collision avoidance and driver support radar blocked warning   CCM Data used to command a radar blocked message in the message center.
Forward collision chime request   CCM Data used to command warning chime during a 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.

  Network Input Messages - IPMA


Broadcast Message Originating Module Message Purpose
Collision avoidance and driver support radar status   IPMA Data used to communicate the function status of the camera in the IPMA.

  Network Input Messages - ABS Module


Broadcast Message Originating Module Message Purpose
Collision mitigation by braking deceleration request   CCM Data used to enable the brakes to slow vehicle speed when the pre-collision assist system determines that a collision is imminent.
Collision mitigation by braking brake pre-charge   CCM Data used to enable the ABS module to pre-charge the brakes to prepare them for rapid braking by the driver.

Pre-Collision Assist System Operation

The pre-collision assist system is offered as a camera-only option without ACC. An additional safety feature on vehicles equipped with ACC uses both the CCM (radar) and the IPMA. The system is active whether the ACC system is on or off. If the system detects a vehicle, pedestrian or other object in the vehicle path of travel, the system provides three levels of functionality:

  • Visual and audible alert
  • Brake support
  • Active braking

Vehicles equipped with ACC use object detection information from the radar sensor integrated in the CCM and the forward-looking camera in the IPMA mounted on the windshield below the rear view mirror. The CCM and the IPMA scan a designated area in front of the vehicle. Network messages sent between the CCM and the IPMA on dedicated CAN circuits, which determine whether an object, vehicle or pedestrian is in the path of travel, the approximate distance to the object and how fast the vehicle is approaching it.

Vehicles equipped without ACC uses object detection information from the forward-looking camera in the IPMA only.

When the vehicle approaches the object, the IPMA sends a message through the GWM to the IPC module to turn on the red pre-collision warning indicator in the message center and to sound an audible alert. The IPMA also sends a message to the ABS module to pre-charge the brakes in order to prepare them for rapid braking. If the system determines that a collision is imminent, an active braking message is sent from the IPMA to the ABS module. The system reduces the gap between the brake pads and discs, applying the brakes to slow vehicle speed without driver intervention.

The pre-collision alert system uses image recognition software that differentiates shapes, which allows the system to determine if the approaching object is a vehicle or a pedestrian. If the camera does not recognize the shape as a vehicle or a pedestrian, the system does not provide full function.

The system may not work properly at night, in direct or low sunlight, when camera vision is reduced due to weather conditions or a blocked CCM radar sensor. If the IPMA camera module is obstructed, the pre-collision system does not respond properly to pedestrians or stationary vehicles and reduces the ability to recognize moving vehicles. Unconventional vehicle types, pedestrians in groups or with complex backgrounds or partly obscured pedestrians may not be detected by the system.

The pre-collision assist system is active at speeds above 5 km/h (3 mph) and pedestrian detection is active at speeds up to 80 km/h (50 mph).

The pre-collision assist system has three levels of sensitivity detection (HIGH, NORMAL and LOW) that can be changed through the message center display in the IPC. The alert sensitivity is adjusted and active braking can be turned off in the IPC. The active braking function reverts back to ON at the next ignition cycle.

When a system fault is detected with the pre-collision warning system, the message PRE-COLLISION ASSIST NOT AVAILABLE SENSOR BLOCKED or PRE-COLLISION ASSIST NOT AVAILABLE 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.

All CCM Diagnostic Trouble Codes (DTCs) are sent to the IPMA on a dedicated private CAN. The IPMA acts as a gateway for the CCM.

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