Yes, in most vehicles equipped with Hill Descent Assist (HDA), there are specific controls to activate and adjust the system. The exact controls can vary depending on the make and model of the vehicle, but generally, you can expect the following:

Common Ways to Activate Hill Descent Assist:

1. Dedicated Button: Many vehicles have a Hill Descent Assist button, which is typically located on the center console or near the gear lever. The button may be labeled with a symbol of a car descending a slope. Pressing this button activates the system.
2. Off-Road or Terrain Mode: In some vehicles with advanced off-road or terrain management systems, activating a specific driving mode (e.g., "Off-road," "Mud/Sand," "Rock Crawl," etc.) will automatically engage Hill Descent Assist. The vehicle will then control the braking and throttle to maintain a safe, steady speed when descending a hill.
3. Transmission Shift: In some models, Hill Descent Assist may automatically engage when the vehicle is in low gear (typically for off-road vehicles or 4WD models). You may need to manually shift into low gear, and the system will activate.
4. Speed and Brake Activation: In certain systems, Hill Descent Assist will automatically activate when the vehicle detects a steep incline, especially when it is traveling at low speeds and the brake pedal is pressed lightly.

Deactivating Hill Descent Assist:

• To deactivate Hill Descent Assist, you can usually press the button again or deactivate the off-road mode in your vehicle's settings.

Customizing Hill Descent Assist:

Some vehicles also allow you to adjust the system's sensitivity or speed control (e.g., slower or faster descent) through the vehicle’s settings or infotainment screen.

To get the most accurate information for your vehicle, it’s best to refer to the owner’s manual, as the activation method may differ by make and model.