Cruise Grade Braking Description: Function

Automatic downshifting to assist in speed control will activate when vehicle speed has increased from the set point by a certain amount. Multiple downshift may be commanded depending on the amount of deviation of vehicle speed to the set speed. As vehicle speed slows and approaches the original set speed, upshifts will be commanded to return to a normal operating condition.
At some speeds and on some downhill grades, the transmission may not be able to command a gear low enough to slow the vehicle to the set point without overspeeding the engine.
In this case the transmission will command all available downshifts, but if further engine braking is desired, the driver must press the brake pedal to slow the vehicle enough so additional downshift(s) can be commanded.
Pressing the brake pedal has the normal effect of cancelling cruise control operation and in this case a transition to Normal - Powertrain Braking is completed.
As always, if cruise control operation was cancelled through usage of the brake pedal, it must be reinitiated by tapping either the Set or Resume Cruise switches.