Advanced Emergency Brake Assist (AEBA)

Advanced Emergency Brake Assist (AEBA) improves braking response during emergency braking, and is an enhancement of the electronic brake prefill and emergency brake assist functions controlled by the ABS control module.

For additional information, refer to: Anti-Lock Control - Stability Assist

With AEBA, if the risk of a collision increases after the vehicle passes the forward alert activation threshold, the ASCM signals the ABS control module to activate the electronic brake prefill and emergency brake assist functions. With AEBA, the electronic brake prefill function operates in two stages:

Stage 1:
- Applies a brake pressure of approximately 3 bar (43.5 lbf/in² ) to all of the brakes
- Lowers the AEBA activation threshold in the ABS control module
- Signals to the BCM/GWM on the High Speed (HS) Controller Area Network (CAN) powertrain systems bus to activate the stop lamps.
Stage 2:
- increases the brake pressure to approximately 10 bar (145 lbf/in² ).

Stage 1 is activated if the collision risk increases to a level considered as credible, with the accelerator pedal pressed.

Stage 2 is activated when the accelerator pedal is released during an imminent risk of collision. If the accelerator pedal has already been released when the collision risk increases to the credible level, the two stages of electronic brake prefill are activated simultaneously, to give an immediate brake pressure of 10 bar (145 lbf/in² ).

While the second stage of electronic brake prefill is active, if the brake pedal is then pressed quickly, the ABS control module activates AEBA, even if only light pressure is applied to the pedal.

AEBA is available at vehicle speeds above 7 km/h (5 mph) and will function even when forward alert and adaptive cruise control are switched off.

If a fault occurs in the system, a related message is displayed in the message center. AEBA will not be available until the fault is rectified.