PREVOST H3-41 - Page 41

CONTROLS AND INSTRUMENTS
DDEC Diagnostic Request
With the engine at idle or OFF
and with the
ignition switch in the ON pos
ition, press and
release the Engine Stop Override rocker switch.
Active codes will be flashed on the “ Stop
Engine “ and inactive codes on the “ Check
Engine “ telltale lights alternately. The first digit
of the d
iagnostic code is determined by the
number of flashes before a short pause. The
second number of the diagnostic code is then
flashed in the same manner. As an example,
code “ 25
“ (everything O.K.) consists of two
flashes, followed by a short pause, then five
flashes. Refer to the “Technical Information”
chapter under “DDEC IV Diagnostic Codes”.
Central Locking System
06266
This optional system enables
locking baggage bays
and
engine curb side door
by
pressing the switch
forward. To
unlock, press the switch
rearward.
Note: Doors must be locked using the key first,
they can then be unlocked/locked using the
central locking system.
Coolant Heater Switch
06267
This switch is operational only
when the ignition switch is in the
ON position.
When activated, the heater timer
is bypassed and remains
activated as long as the ignition
switch is in the ON position.
The purpose is to provide additional heat from
the coolant heater, thereby
supplementing the
central heating system when required.
The coolant heater will turn ON or OFF
automatically depending on coolant
temperature.
Wheelchair Lift (Optional)
06268
Activate the optional wheelchair
lift
electrical circuit by pressing
down o
n the rocker switch.
Refer to “Other Features” for
instructions on operating the
wheelchair lift.
Safety Switch
06269
Both the 12 volt and 24 volt
electrical systems are activated
by this switch. A telltale light on
the dashboard and a LED on the
switch illuminate when the
switch is depressed and the
circuits are closed.
This switch is bypasse
d when
the engine is running. When the
engine is not running, the safety
switch cuts off all electrical
components from the batteries,
except for the battery equalizers
and monitor, the transmission electronic control
unit (ECU) memory, vehicle interfac
e module
(VIM), the coolant heater and optional
refrigerator power supply.
Caution: When parking the coach overnight or
for an extended period of time, open the
electrical circuits using the safety switch.
Radiator Fan Override (Optional)
06236
Depressing the switch overrides
the radiator
fan’s thermostatic
switch, keeping the fan
continuously on. This feature is
useful when the fan switches on
and off repeatedly, such as
when driving up a long grade or
when driving in ver
y hot
weather.
Caution: Do not use this feature unnecessarily
as it will shorten fan life, reduce available
horsepower and increase noise and fuel
consumption.
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