SYSTEM OPERATION



Function


The FCM has the following functions:
Function
General
Forward collision warning function
Activate the visible warning on the combination meter and audible warning when the system determines that a forward collision is imminent.
Forward collision mitigation brake system prefill
Increases the brake fluid pressure in advance to enhance the response during the driver’s braking operation when the system determines that a forward collision is imminent.
Forward collision mitigation brake assist
Advances the brake assist timing when the system determines that a forward collision is imminent.
Forward collision mitigation brake
Activates the automatic emergency braking to reduce the vehicle speed when the system determines that a forward collision is not avoidable.
Forward collision mitigation brake for low speed driving
Activates the automatic emergency braking to reduce the vehicle speed when the system determines that a forward collision is imminent when the vehicle is being driven at 30 km/h or less. Stops the vehicle to avoid the collision under certain circumstances.

Operation


The system calculates the distance and the relative velocity between the vehicle travelling ahead and your vehicle by using a radar. If the system determines that a straightforward collision is imminent, it will avoid or reduce the injury or damage due to the collision by performing the controls shown in the table below:


Control
Collision is possible
Collision is imminent
Collision is not avoidable
Forward collision warning function
Warning indicator






Buzzer
Sounds
Sounds
Sounds
Forward collision mitigation brake system prefill
Increase the brake fluid pressure.
-
-
Forward collision mitigation brake assist
Assists the braking force in accordance with the driver's brake operation.
Assists the braking force in accordance with the driver's brake operation.
Assists the braking force in accordance with the driver's brake operation.
Forward collision mitigation brake*
-
Weak automatic-braking
Strong automatic-braking
note *: If two seconds elapse after the forward collision mitigation brake stops the vehicle, it can be deactivated automatically.

FCM ON/OFF SWITCH



The FCM ON/OFF switch is installed at the instrument panel left lower side. You can switch the FCM (on and off) and the warning timing ("FAR" and "NEAR") by operating this switch.

How to switch on and off the FCM


The FCM is toggled between on and off when the FCM ON/OFF switch is pressed for 1.5 seconds or more. When the FCM is toggled, the system will inform the driver of it by the combination meter LCD display * and the buzzer.
note *: If the FCM is toggled off, "FCM OFF display" will be shown on the combination meter LCD screen. If the FCM is toggled on, a current warning timing will be shown on the combination meter LCD screen.

How to switch the FCM warning timing


The FCM warning timing is toggled when the FCM ON/OFF switch is pressed for less than 1.5 seconds with the FCM activated. When the FCM is toggled, the system will inform the driver of it by the combination meter LCD display and the buzzer.

Fail-safe and self-diagnosis functions


The ACC/FCM-ECU constantly monitors the input and output signals. If the system detects a malfunction, it will send a failure signal to the combination meter and prohibit the FCM control under circumstances. The combination meter will provide a visual and audible warning to inform the driver of it. The ACC/FCM-ECU has the following functions for easier system checks.

All the above items can be diagnosed using M.U.T.-III.

Radar adjustment


If the ACC/FCM-ECU is replaced or removed and installed, adjust the radar by using the M.U.T.-III.
note For how to adjust the radar, refer to the WORKSHOP MANUAL.