Our Jake works with Jake on low when the switch is depressed to the rear, Jake off when the switch is level, and Jake on high when the switch is depressed to the front. When the switch is depressed to either low or high, there is a yellow light on in the dash. With the Jake switch on either low or high, then the Jake activates to low when the vehicle speed is 2 1/2 mph over the cruise control setting and a second yellow light comes on at the dash. If the vehicle speed increases to about 4 or 5 mph over the cruise control setting and the Jake switch is on high, then the Jake goes to high. When cruise control is off, then the Jake always activates to whatever the switch is set to, low or high, at any speed.
On the SilverLeaf screen when the Jake is activated to low, then the "J" is green; when activated to high, then the "J" is red. Interestingly, at 2 1/2 mph over the cruise control setting and the Jake activated, then the "J" is green. But at about 3 or 4 mph over, then the "J" changes to yellow. At about 4 or 5 mph over, then the "J" changes to red. Actually, I don't recall at this moment if the Jake initially changes to high with the yellow "J" or the red "J".
One may wonder how I know all this detail because this stuff only happens when starting down a steeper hill. lol With the Jake switch on high I usually touch the brakes when the Jake comes on when going down a steeper hill to insure the cruise control setting is off and the Jake is always on high. And I had our Jake programming changed to not cause a transmission gear change when it activates - a much better setting!