EMERGENCY STOP SIGNAL SYSTEM (ESS)

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Outline

•  The emergency signal system (ESS) warns the driver of a vehicle following behind of an emergency braking situation by automatically and rapidly flashing the hazard warning lights when the vehicle decelerates suddenly while traveling at high speeds.

Function

•  The front body control module (FBCM) gives priority to the emergency signal system (ESS) operation even if the turn switch is turned on during the emergency signal system (ESS) operation.
•  When the hazard warning switch is turned on during the emergency signal system (ESS) operation, the front body control module (FBCM) stops the emergency signal system (ESS) operation and gives priority to the hazard warning light flashing operation.
•  The front body control module (FBCM) controls the emergency signal system (ESS) based on the following CAN signals:

CAN signal sending module

Signal name
PCM
Brake switch position signal
Vehicle speed signal
ABS HU/CM (without DSC)/DSC HU/CM (with DSC)/
Wheel speed (LF, RF, LR, RR) signal
ABS operation condition signal
Vehicle acceleration speed signal

•  The emergency signal system (ESS) has two warning modes; the sudden deceleration hazard warning mode in which the hazard warning lights flash rapidly, and the emergency stop hazard warning mode in which the hazard warning lights flash normally.

Sudden deceleration hazard warning mode

•  The sudden deceleration hazard warning mode operates when the brake pedal is depressed while driving at a vehicle speed of 60 km/h {37 mph} or more and emergency braking is determined based on the vehicle's deceleration.
•  When the sudden deceleration hazard warning mode operates the hazard warning lights flash at 3.5 Hz.


Emergency stop hazard warning mode

•  When the brake pedal is depressed at a vehicle speed of 10 km/h {6.2 mph} or less after the sudden deceleration hazard warning mode operates, the modes switches to the emergency stop hazard warning mode.


Structural View

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System Wiring Diagram

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Operation

1.  If the brake pedal is depressed and the vehicle is decelerated while the vehicle is driven, the front body control module (FBCM) calculates the vehicle deceleration speed based on the wheel speed signal and the vehicle acceleration speed signal.

2.  If the vehicle speed is approx. 60 km/h {37 mph} or more when the calculation is finished, and the calculated deceleration speed is the set value or more for the sudden deceleration hazard warning mode, the front body control module (FBCM) controls the flashing of the hazard warning light at 3.5 Hz and sends a direction indicator light signal to the instrument cluster simultaneously.

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3.  The front body control module (FBCM) stops the operation of the sudden deceleration hazard warning mode if it receives a brake switch off (brake pedal not depressed) signal or if the estimated deceleration value is the set value or less for stopping the sudden deceleration hazard warning mode or less.

4.  If the vehicle speed is 10 km/h {6.2 mph} or less and the brake switch on (brake pedal depressed) signal is sent after the sudden deceleration hazard warning mode operates, the front body control module (FBCM) controls the flashing of the hazard warning lights at 1.5 Hz (same as normal flashing).

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5.  If the brake switch off (brake pedal not depressed) signal and vehicle speed signal are sent, the front body control module (FBCM) stops the operation of the emergency stop hazard warning mode and turns off the hazard warning lights.


Prevention of emergency signal system (ESS) unnecessary operation

•  If the servicing procedure requiring the braking force inspection is performed, unnecessary operation of the emergency signal system (ESS) can be prevented if necessary.
•  The operation of the emergency signal system (ESS) can be canceled by performing the procedure for preventing unnecessary operation of the brake override system. For the procedure to prevent unnecessary operation of the brake override system, refer to the [DRIVE-BY-WIRE CONTROL]/[FUEL INJECTION AMOUNT CONTROL]. (See DRIVE-BY-WIRE CONTROL OPERATION [MZR 1.6].) (See DRIVE-BY-WIRE CONTROL [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See FUEL INJECTION AMOUNT CONTROL [SKYACTIV-D 1.5].) (See FUEL INJECTION AMOUNT CONTROL [SKYACTIV-D 2.2].)