Hi Nick -
From the Firestone installation manual - with some clarification.
STEP 7- USING THE WIRELESS CONTROLLER
With the Air Command kit and the air springs installed, you are ready to test the system. Place the 9V battery into the controller. Turn the coach red battery disconnect switch on.
Press the MODE or any other button to turn on the remote. The MODE and ARROW keys are used to cycle through the screen and make selections to inflate/deflate the air springs. Pressing the MODE button once will display an arrow pointing at the Front Left (FL) corner. Pressing the up/down button at this time will change the pressure in the air spring. Continuing to press the MODE button will cycle through the corners:
Press MODE
Selection
1
Front Left (LF)
2
Front Right (RF)
3
Rear Left (LR)
4
Rear Right (RR)
5
Fronts (LF & RF)
6
Rears (LR & RR)
7
All corners (LF,RF,LR,RR)
8
Returns to single selection (LF)
**NOT ALL FUNCTIONS
ARE USED·IN
THE 2 CORNER SYSTEM**
Once the pressure has been selected, the system will turn on the compressor or open the exhaust valve to change the pressure. The change can be stopped by pressing either arrow key.
The display will turn off after 20 seconds of inactivity. To show the display, just press any of the buttons. End of Firestone words.
I remember that the Memory buttons are set by holding one of them down for a while when the displayed pressures are what you want for the rear two bags. Later the Memory button is used to return the two bags to the previously desired pressure.
Just "playing" with the unit should show what needs to be done to get what you want.
It seems like the van rear leveling capability of the air bags is equivalent to about a 2 inch thick board under one rear tire.
Take Care -
Chuck Sorensen
Buellton, California
2012 Excel TS