PREVOST H3-41 Maintenance Manual page 205

Problem/Symptom
None of the Multiplexed
functions are operating,
including the basic limp-
home functions (door
opening, flashers, wipers
in speed 1)
"FLIP REAR BREAKER
TO INITIATE I/O
MODULES
PROGRAMMING" pop-up
message appears in the
DID
Note: The sunshades are
still functioning since
these are not multiplexed
Many secondary functions
(not essential for driving)
not functioning (interior
lighting, driver's area
lighting, wiper speed 2
and intermittent).
Marker lights and
clearance lights
turned ON when setting
ignition to the ON
position.
No temperature control in
the passenger area
Passenger temperature
display indicates two
dashes "--"
Probable Causes
The program version in the
MCM is different than the
program in the I/O modules
and the MCM is forcing all
I/O modules to stay inactive
The MCM module does not
receive 24 V power.
The DL0 (BBUS
network is not working. It
could be caused by a short
on the network, an open
circuit, a problem with the
are
MCM or the MCM being
disconnected
network.
Problem with
temperature sensor located
in the
compartment air intake or the
sensor wiring
PA1621 Maintenance Manual All Series | Revised Sept 2019
1. Engage the auto-programming of the
I/O modules: Turn the ignition key to
the ON position, trip and reset circuit
breaker CB6.
2. The
AUTOPROGRAMMING I/O MODULE
PLEASE
reprogramming is complete.
1. Check / reset circuit breaker CB6.
Check / replace fuse F1
2. Operate
starting the vehicle from the engine
MUX)
compartment (REAR START). All
functions
available
To close and lock the door, pull the door
manually up to its closed position and it
from the
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
SECTION 06: ELECTRICAL
Actions
DID indicates
WAIT" until
in limp-home mode
essential to drive
by playing with
41
"MUX
the
by
are
the