C:\TEMP\ml59101.doc | Revised: 20JUN18 | Page 20 of 39
AUTOMATIC DIAGNOSTICS
Step 12. For a detailed explanation of the automatic leveling sequence, see “AUTOMATIC OPERATION” in PART 1
of this manual.
Make sure the park brake is set. Start the engine and make sure the air tanks are full. Push the “AIR”
button. The blue SYSTEM ACTIVE light above the “AIR” button should flash. One or two yellow level lights may be on. The
system will exhaust air from all air bags lowering the vehicle, even if no yellow level lights are lit. If no level lights are on
after all air has been exhausted from the air bags, the system will go immediately into the SLEEP mode. When all air is
exhausted from the bags, if any yellow level lights are lit, the system will level the vehicle by raising the low side and/or end
of the vehicle. When all four level lights are out, the vehicle is level and the processor will go into the SLEEP mode. The
LEVELING SYSTEM ACTIVE light will now flash rapidly. The ignition key can now be turned off. The LEVELING SYSTEM
ACTIVE light will continue to flash rapidly.
NOTE: After the initial lowering procedure of automatic leveling, if any yellow level lights are lit, one lower valve and the
compressor are turned on and will remain on until leveling is achieved or the system goes to EXCESS SLOPE.
EXCESS SLOPE occurs if the system tries to level the vehicle for 15 minutes and a yellow level light remains on.
The SLEEP mode will continue with the LEVELING SYSTEM ACTIVE light flashing rapidly until the “CANCEL” button or
the “TRAVEL MODE” button is pushed with the ignition in “ON” or “ACC”. Releasing the park brake with the ignition on or
off will cancel the SLEEP mode and turn the LEVELING SYSTEM ACTIVE light off.
TROUBLE SHOOTING
PROBLEM
SOLUTION
DIAGRAMS
Step 12a. The
“NOT IN
PARK/BRAKE”
light comes on
while pushing
the “AIR”
button.
If the system is working with the manual UP and DOWN arrow
buttons, this is a near impossibility. Review Step 7.
Step 12b. The
LEVELING
SYSTEM
ACTIVE light
will not come
on.
Push any UP or DOWN arrow button. If the system functions
with a manual button, replace the touch panel. If the system is
not functioning in manual, start back with Step 1 and continue
until the system functions with the manual UP and DOWN
arrow buttons.
Step 12c. The
vehicle is not
level within
tolerances after
auto leveling
It is critical that the yellow leveling lights and the air bag
pressure switches are functioning properly. Review Step 6 to
check the level sensor and Step 8 to check the 20 psi air bag
pressure switches.
LATCH IN RELAY ASSEMBLY INFORMATION (FOR SLEEP MODE) -
The ignition can be turned off after automatic
leveling is complete. The system should remain in the SLEEP mode. There is a relay assembly that is used to latch in
power to the MIOM and touch panel. This assembly is located within about 18” of the front air module.
The latch in relay assembly will be on any time the ignition is in the “ON” or “ACC” position. There are two relays in the
assembly labeled CR1 and CR2. Ignition and battery power are routed to the relay assembly. The battery power is routed
through a reset switch to the normally open contacts of CR1. The reset switch is a momentary, normally close switch and
should be close to the relay assembly. Main ignition power for the front MIOM and touch panel is routed to the front MIOM
main connector, pin A1, through this latch in assembly and is used to turn CR1 relay on. The CR1 relay supplies battery
power to the front MIOM main connector, pin D1, when the ignition is on.
There are four wires between the MIOM and latch assembly: red 6120, +12 ACC power, main connector, pin A1 and red
6102, +12 battery, main connector, pin D1. The black 7500, sw. +12 for CR2 control and the white 6235, ground for relays
are in a 2-pin Packard connector at the MIOM. Ground on the 6235 wire is constant. The 6120 +12 ACC wire and the 6102
+12 battery wire will have +12 volts whenever the ignition is on. The 7500 CR2 relay control wire will have +12 volts
anytime the ignition is on or with the ignition off if the leveling system is in the SLEEP mode.
