PREVOST X3-45 COACH 2018 Operator's Manual page 208

Appendix B – Troubleshooting Guide for Multiplex Vehicles
2
Problem/Symptom
Many secondary functions
(not essential for driving)
not functioning (interior
lighting, driver's area
lighting, wiper speed 2
and intermittent).
Marker lights
clearance lights
turned ON when setting
ignition to the
position.
No temperature control in
the passenger area
Passenger temperature
display indicates two
dashes "--"
Entrance door does not
open nor close using the
control buttons
Defroster fan
functioning
Windshield wipers
functioning in speed 1 or
intermittent
Windshield wipers
functioning in speed 1 or
intermittent
HVAC condenser fans not
functioning in speed 1
HVAC condenser fans not
functioning in speed 2
Windshield washer
functioning
Windshield upper section
Probable Causes
The MCM 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
and
the MCM or the MCM being
are
disconnected
network.
ON
Problem with
temperature sensor located
in the
compartment air intake or the
sensor wiring
Module AE47 is not powered
or is faulty
not
not
not No power on R27
Circuit breaker CB5 tripped
Circuit breaker CB5 tripped
not Module AE44 is not powered
or is faulty
PA1627 X3-45 Operator's Manual
1. Check / reset circuit breaker CB6.
Check / replace fuse F1
2. Operate
starting the vehicle from the engine
compartment (REAR START). All
functions
available
To close and lock the door, pull the door
from the
manually up to its closed position and it
will lock by itself. The door opening button
is still functioning
the Instruct the driver to manually control the
temperature
evaporator passenger set point. Set above 22°C
(72°F) to heat and below 22° C (72°F) to
cool
1. Check the SYSTEM DIAGNOSTIC
menu of Driver Information Display
(DID). 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 CB1
3. Check / replace fuse F45
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
Check CB48 (VECF)
Check / reset circuit breaker CB5
Check / reset circuit breaker CB5
Check / replace fuse F135
1. Check the SYSTEM DIAGNOSTIC
menu of Driver Information Display
(DID). Select FAULT DIAGNOSTIC
Actions
in limp-home mode
essential to drive
by playing with
by
are
the