MI91.327U
20DEC12
AUTOMATIC LEVELING SEQUENCE CONTINUED
STABILIZE MODE:
6. Stabilize mode is when any jack not used to level the vehicle is extended to the ground. Jacks that are used to stabilize the
vehicle should lift the vehicle at least 3/4 to 1 inch after the jack touches the ground. Each jack has a pressure switch mounted
on it. The pressure switch is a normally open, one wire switch. The switch closes when the jack touches the ground and lifts
the vehicle 3/4 to 1 inch. The closed switch sends a ground signal to the I/O module.
7. In the stabilize mode, the system follows a set procedure for checking the jack pressure switches and extending jacks as
needed to stabilize the vehicle. The procedure is as follows:
1. Check the right rear jack pressure switch. Extend the jack if necessary until the jack pressure switch comes on.
2. Check the left rear jack pressure switch. Extend the jack if necessary until the jack pressure switch comes on.
3. Recheck the right rear jack pressure switch and extend the jack if necessary.
4. Recheck the left rear jack pressure switch and extend the jack if necessary.
5. Check both front jack pressure switches. If either jack pressure switch is not on, extend both front jacks at the same
time until both front jack pressure switches are on.
Note: If one of the front jacks is already on the ground, because of the check valve arrangement in the manifold
and fluid flowing to the path of least resistance, the jack on the ground should extend very little if any.
6. When both front jack pressure switches are on, the system will check the yellow level lights. If any light is on, the system
will extend jacks as necessary, starting with a lit side level light, to turn all yellow level lights off.
7. When all yellow level lights are off, the system will then shut off, no mater what condition the jack pressure switches are in.
Note: During the stabilize mode, the pump only runs if a jack needs to be extended. The pump will most likely turn on
and off several times while checking the jack pressure switches and yellow level lights during the STABILIZE MODE.
8. When the system has completed the stabilize mode, the system will shut off. The red warning lights will remain on until
the ignition is turned off. If the ignition is in the ON position, not ACC position, the master warning light and buzzer will be
on until the ignition is turned off.
AUTOMATIC LEVELING SEQUENCE
725 TROUBLE SHOOTING STEPS
AUTOMATIC LEVELING DIAGNOSTICS
The ignition is in the "ON" or "ACC" position and the park brake is set.
Note: If there are no yellow level lights lit on the touch panel, the system will go directly to the stabilize mode of the
automatic leveling sequence. If the vehicle has an air suspension with a HWH controlled air dump, the system will
dump air for approximately 25 seconds and then proceed to the stabilize mode. It is best to have the vehicle in a
non-level position so yellow level lights are on to test automatic leveling.
A. THE AUTO LEVEL LIGHT WILL NOT FLASH WHEN THE AUTO LEVEL BUTTON IS PUSHED. THE "NOT IN
PARK / BRAKE" LIGHT ON THE TOUCH PANEL IS NOT COMING ON. Push any manual UP ARROW button. If the
system functions, replace the touch panel. If the system does not function, review PART 7a. SECTION B.
B. THE AUTO LEVEL LIGHT WILL NOT FLASH WHEN THE AUTO LEVEL BUTTON IS PUSHED. THE "NOT IN
PARK BRAKE" LIGHT ON THE TOUCH PANEL IS COMING ON WHILE THE AUTO LEVEL BUTTON IS PUSHED.
Review PART 5 for park brake issues.
C. THE AUTO LEVEL LIGHT FLASHES BUT THE SYSTEM IS NOT FUNCTIONING PROPERLY. If the system has
functioned properly when being operated manually, the system should perform properly in the auto leveling mode if the
auto level light is flashing. During steps 2 thru 5 of the leveling mode, if there is a malfunction, review PART 6 for air
dump problems and 7a. for leveling problems.
PART 9. AUTOMATIC LEVELING MODE.
