Honda Ridgeline 2022 Owner's Manual page 13

Auto Idle Stop Function
To improve fuel economy, the engine stops and then restarts as detailed below. When Auto Idle Stop is on, the Auto Idle Stop indicator
(green) comes on. (P406)
At
Deceleration
Stop
Start-up
Automatic transmission
Stop the vehicle and depress the brake
pedal.
Keep the brake pedal depressed.
Release the brake pedal.
Engine status
On
Off
Restarting
* Not available on all models 11