PREVOST X3-45 Multiplex User Manual

Section 06: ELECTRICAL
PA1562
27
Problem/Symptom Probable Causes Actions
4. Try disconnecting the CECM
completely, leave it disconnected and
see if the limp-home functions (start
of the vehicle from the engine
compartment, wipers speed 1,
flashers, etc ) are functioning
Many secondary functions
(not essential for driving)
not functioning (interior
lighting, driver's area
lighting, wiper speed 2
and intermittent).
Outside temperature
display in the telltale LCD
panel displays three
dashes "---"
Marker lights and
clearance lights are
turned ON when setting
ignition to the ON
position.
The CECM module does not
receive 24 V power.
The CAN network is not
working. It could be caused
by a short on the network, an
open circuit, a problem with
the CECM or the CECM
being disconnected from the
network.
1. Check / reset circuit breaker CB6 (3
rd
from the bottom on the right side
column) Check / replace fuse F1
2. Operate in limp-home mode by
starting the vehicle from the engine
compartment (REAR START). All
functions essential to drive are
available
To close and lock the door, pull the door
manually up to its closed position and it
will lock by itself. The door opening button
is still functioning
No temperature control in
the passenger area
Passenger temperature
display indicates two
dashes "--"
Problem with the
temperature sensor located
in the evaporator
compartment air intake or the
sensor wiring
Instruct the driver to manually control the
temperature by playing with the
passenger set point. Set above 22°C
(72°F) to heat and below 22° C (72°F) to
cool
Entrance door does not
open nor close using the
control buttons
Defroster fan not
functioning
Windshield wipers not
functioning in speed 1 or
intermittent
Module A47 is not powered
or is faulty
1. Check the SYSTEM DIAGNOSTIC
menu of the message center display
(MCD). Select FAULT DIAGNOSTIC
and ELECTRICAL SYSTEM. The
message “No Response ModA47,
Active” indicates a power problem on
the module. (A CAN network problem
would show the same message but
doesn't produce these symptoms).
2. Check / reset circuit breaker CB6
3. Check / replace fuse F5
4. Probe gray connector on module to
see if it is powered.
5. Use the air release valves near the
entrance door and in the front service
compartment to lock / unlock the door
Windshield wipers not
functioning in speed 1 or
intermittent
No power on R23 Check / replace fuse F82

PREVOST X3-45 Multiplex Specifications

General

Length	45 ft
Width	102 in
Engine	Volvo D13
Horsepower	500 hp
GVWR	54, 000 lbs
Height	146 in
Sleeping Capacity	Varies based on floor plan
Water Capacity	Varies based on floor plan