The integrated push button/display is the primary
interface for display of system information and for push
button entry of system instructions. The following
sections explain the purpose and operation of the ECU
controls and display.
These keys select pressures appropriate for different
surface conditions. Any mode may be selected at any
time (within built in speed limitations). Depressing the
button for the current mode will result in a pressure
HWY (Highway) For operation on improved paved
XC (Cross Country) For operation on non-paved
SAND (Sand) For operation on trails and other
EMER (Emergency) For selection of extremely low tire
pressures to help free a stuck vehicle, or to traverse a
short distance over a terrain known to require very low
tire pressures. Since this is an extremely low pressure,
the warning lamp will flash whenever this pressure is
CAUTION: The EMER key is for extreme
conditions only and should not be used for
Load Switch (Optional)
This switch selects pressures appropriate for different
vehicle load conditions (loaded, part-loaded, un-loaded).
Switching the load setting will result in a pressure check,
determined by the system.
Mode Annunciator Lights
The associated annunciator lights indicate the selected
mode and signal one of two states:
If the light is flashing the system is in the process of
checking or changing pressures to attain the pressure(s)
associated with that mode light.
Some clicking may be heard from the PCU as the
system cycles to achieve the new pressure(s). A deflate
will be periodically interrupted as the system checks tire
pressures to determine how much further deflation is
Adequate supply system pressure is required to
begin, or continue any pressure changing sequence.
If the light is on steady the selected pressure has been
achieved, the tires have been isolated and the system is
depressurized. The system will cycle periodically to
assure that tire pressure is maintained.
The system is designed to allow tire pressure
increase due to heat buildup during vehicle use.
This system will not automatically deflate these
pressure buildups a lower pressure mode selection
by the operator must be selected to initiate a deflate.
Run Flat Key and Annunciator Light
This key instructs the system to check tire pressures at
more frequent intervals. This key also allows the
operator to over-ride the 4 flashing lights (tire leak
imbalance) codes and re-attempt 2 lights and some 5
lights codes. (See Warning Signals in next section).
While the system is in RUN FLAT mode, the RUN FLAT
light will flash on and off. The "RUN FLAT" feature will
automatically deselect after 10 minutes, or may be shut
off by pressing the button a second time.
CAUTION: Selecting RUN FLAT to enable the
system to inflate a significantly low tire may
cause other tires on that channel to temporarily
lose pressure. This condition will be corrected
once the low tire is inflated to the pressure of the
3-92.12 Change 3