RVA Leveling System Turns On, None Of The Jacks Deploy, Pump Does Not Run

Updated August 12, 2021 23:29

Locate the controller and solenoid control wire - Remove the button panel and follow the harness until you locate the controller.
1. For Automatic system - There are two connectors on the Auto Controller, one plug is red, and one white. The red connector goes to the auto button panel. The white 24 pin connector will be the one needed. On that connector locate pin#23, it will be a brown wire. This brown wire is the wire needed in the following step.
2. For Manual system - There are two connectors on the Manual Controller, one goes to the button panel, and the other goes to the pump solenoid connections. There are three other wires that do not go into one of the two main connectors. These three remaining wires are as follows: A larger diameter red wire, a white wire, and a brown wire. The brown wire is the one you will need in the following step.
Testing the controller - On either the manual or automatic system, press and hold any of the extend buttons one at a time while you back probe the brown wire located in step 1. On the automatic system you will also want to test this wire when you press the automatic function.
1. When any of the extend buttons are pressed you should have 12vdc on the brown wire.
2. If 12vdc is not present at the brown wire when each of the extend buttons are pressed, then replace the controller.
3. If there is power at the brown wire when each of the extend buttons are pressed, and the pump motor does not run. Then continue to the next section.
Testing the Interlock Relay - Follow the brown wire located in Section 2, until you find the relay it connects to (It will be a small, square, black, 5 terminal relay). This relay is usually just laying in the harness under the dash area. It is referred to as the "Interlock Relay".
1. Once this relay is located, you will find the following connection made at this interlock relay.
3. Remember when checking this relay - The wires on 85 and 86 could be backwards, also the two brown wires could be switched. If they are the relay would still function as designed, but it makes the diagram incorrect. If they are interchanged just make your own diagram for testing based on how yours is connected. Just remember that if you have power and ground on 85 and 86 then 87 and 30 should be connected.
4. With the key on, the jack system powered on, parking brake set, and an extend button pressed, you should have 12vdc at terminals 85, 87, and 30.
  1. If you have do have power at all three, then go to Section 4 "Testing the pump motor and motor relay".
  2. If you do have power at one of the brown wires on terminals 87 and 30, and power on 85, then check for ground at terminal 86. That wire comes from the parking brake pressure switch.
    - If you do have a ground at terminal 86 and power at 85 and only one brown wire, then replace the interlock relay.
    - If you don't have ground at 86 then replace the parking brake pressure switch.
Testing the pump motor and motor relay - The pump motor relay is attached to the pump motor by two bolts or a hose clamp.
1. Common locations for the pump are:
  - In a compartment behind the rear wheels on either passenger or driver side.
  - On the passenger side front of the coach between the headlight and the entry steps.
2. Once the pump and relay are located, using your test light and a partner in the drivers area, test the connections on the pump motor relay as follows:
  1. Check to see if you do have 12vdc at one of the large terminals.
    1. If you do have power at one of the larger terminals, then have your partner press an extend button when the key is on and the jack system power is on.
      1. If you have power at the small post on the motor relay when the extend buttons are pressed, then check to see if you have power at the large post.
        
        If you do have power at all three posts when an extend button is pressed, then replace the pump motor.
        
        If you do have power at only one of the large posts when the small post has power, then replace the pump motor relay.
      2. If you don't have power at the small terminal then replace the wire, or find the disconnect between the interlock relay and the pump motor relay.
    2. If you don't have power at one of the large terminals on the pump motor relay, then find the fuse or breaker that makes the connection to the battery and test that for power through it. If it is blown then, check the length of the cable for failure. If the cable checks out, then replace the pump motor and the pump motor relay as a pair.