From the 2015 Dynasty owners manual. The SAME pump and assbly operates the HYD slide rooms and the Leveling Jacks and this states the pump is connected to the COACH batteries. Doug
If the slide room does not operate, the house
batteries may be discharged or a safety feature
may be engaged to prevent room operation.
If the slideout does not respond from
switch, check the following requirements:
Engine is off.
Park brake is applied.
Confirm house batteries are charged.
House battery disconnect switch is on.
Lock bar is removed.
Jacks are retracted (if applicable) with
the motorhome supported by the air
suspension (air springs)