C:\TEMP\ml59101.doc | Revised: 20JUN18 | Page 5 of 39
PART 1 – 700 SERIES SYSTEM OPERATION
This section is a description of the touch panel and how the system works, automatically and manually along with a
description of how the “DUMP” and “RAISE” buttons work. If you have a good working knowledge of the system,
skip ahead to the diagnostics. If you are not familiar with the system, it would be a good idea to review this section.
The 700 series air leveling system is a computer controlled BI-AXIS push button system. The system has one touch automatic
operation or can be controlled manually. The system will always raise or lower two corners of the vehicle at the same time, in
automatic or manual leveling.
The buttons and lights of the touch panel are briefly described on the previous page. The ignition must be in the “ON” or “ACC”
position for the “AIR”, “DUMP”, “RAISE” or the manual UP and DOWN arrow buttons to function.
Pushing the “AIR” button
one time starts the automatic leveling sequence.
The “TRAVEL MODE” button
will take the system out of automatic leveling, SLEEP mode, a DUMP procedure, or a RAISE
procedure and return the system to the TRAVEL mode. The vehicle will return to ride height if the ignition is on and there is
adequate air supply.
The “CANCEL” button
will stop the automatic leveling process, SLEEP mode, a DUMP procedure or a RAISE procedure but
WILL NOT
return the system to the TRAVEL mode.
The vehicle will not return to ride height.
The “DUMP” button
will exhaust air from all of the air bags to lower the vehicle and
the “RAISE” button
will add air to all of
the air bags to raise the vehicle. These two buttons will function if the park brake is not set. They will be explained in greater
detail later.
The UP and DOWN arrow buttons
on the right side of the panel are for manual control. The manual UP and DOWN arrow
buttons will function anytime the ignition is in the “ON” or “ACC” position as long as an automatic leveling process has not
been initiated or the system is in the SLEEP MODE. Pushing an UP arrow puts air in the air bags, raising the vehicle and a
DOWN arrow button will exhaust air from the air bags, lowering the vehicle. Pushing an UP or DOWN arrow button will always
control two corners of the vehicle both front, both rear, the right front and right rear and the left front and left rear air bags.
The blue LEVELING SYSTEM ACTIVE light
above the air button will flash slowly if an automatic leveling process is in
progress and flash rapidly when in the SLEEP mode. When in the SLEEP mode, this light will continue to flash rapidly even
when the ignition key is off. This light will only flash for auto level and the sleep mode and should never be on steady.
The blue light above the “TRAVEL MODE” button
will flash a few times after the “TRAVEL MODE” button is pushed. It will
not continue to flash nor should this light ever be on steady.
The four red
WARNING lights
at the corners of the manual UP and DOWN arrow buttons will be on steady anytime the
LEVELING SYSTEM ACTIVE light is flashing or if the “DUMP” or “RAISE” buttons are being used if the ignition is in the “ON”
or “ACC” position.
The four yellow lights
between the WARNING lights are the level indicator lights. A lit yellow LEVEL light indicates that that
side or end of the vehicle is low. One or two LEVEL lights can be on but never opposing lights. The yellow LEVEL lights can
be on if the ignition is on and the park brake is set.
The “NOT IN PARK/BRAKE” light
will come on if the “AIR” button or the manual UP or DOWN arrow buttons are being
pushed with the ignition on. The system will not function in auto or manual if the park brake is not set. The “NOT IN
PARK/BRAKE” light will also come on if the “DUMP” or “RAISE” buttons are being pushed but those buttons will function with
or without the park brake set.
The “EXCESS SLOPE” light
will be addressed when we discuss an EXCESS SLOPE situation during automatic leveling
The green “TRAVEL MODE” light
will be on anytime the ignition is on if the LEVELING SYSTEM ACTIVE light is not flashing
or the RAISE or DUMP lights are not on. The front air manifold will have a 20 psi pressure switch to monitor the air bag
pressure for each side. The rear air manifold will have a 20 psi pressure switch to monitor the air bag pressure for each side
and an 85 psi pressure switch that monitors the system air pressure. If the ignition is on, the park brake is off and a pressure
switch is on, the TRAVEL MODE light will not be on.
Note: Some vehicles may have two air bags for each corner plus one air bag for each side of the tag axle if so
equipped. For ease of discussion we will refer to the “left front air bag”, “right front air bag”, “right rear air bag” and
“left rear air bag”. If the vehicle has an arrangement of two air bags for each side of an axle, these bags will simply be
teed together, acting as one. Tag axle information will be addressed separately when necessary. For most systems,
the tag axle will mirror what the drive axle is doing for leveling purposes.
