Uploading A Multiplex Program Update Into The Mcm; I/O-Ea And I/O-Eb Modules; Replacing I/O-Ea Or I/O-Eb Modules - PREVOST H3-41 Maintenance Manual

SECTION 06: ELECTRICAL
the I/O modules is complete unless a higher
priority message must be displayed. If this is
the case, press ESCape button repeatedly to
acknowledge the higher priority messages.
8. The previous message displayed on the DID
may disappear event if the programming is
not completed. For this reason, wait another
5 minutes before proceeding to the next step.
9. Trip and reset circuit breaker CB6.
10. Check the DIAGNOSTICS menu of the Driver
Information Display (DID). Select VIEW
ACTIVE FAULTS and ELECTRICAL. Verify
the fault message to be certain the module is
reprogrammed. If
reprogrammed, the
Responding" appears where Axx is the
module number (Ex: A41, A42...etc).
3.1.2 Uploading
update into the MCM
An updated vehicle multiplex program saved on
a laptop computer can be uploaded into the
MCM. A laptop computer running Windows XP
or Windows 7 must be connected to the RS232
serial port DB9 connector (identified C226)
found on the front
electrical panel. Please contact your Prevost
Service Representative in order to get the
vehicle specific multiplex program and upload
procedure. Save the specific multiplex program
on your laptop computer.
WARNING
WHEN UPLOADING
SOFTWARE INTO THE MCM ...
Cooling fans WILL start running for a short
while.
Keep hands away from cooling fans or keep
the radiator door closed.
3.2

I/O-EA AND I/O-EB MODULES

I/O-EA modules receive inputs and control
outputs. I/O-EA's are used for all outputs of 1
amp or less.
22 PA1621 Maintenance Manual All Series | Revised Sept 2019
the module is not
message "Axx Not
a multiplex program
service compartment
A NEW MUX
I/O-EB modules receive inputs and control
outputs. I/O-EB's are used for outputs up to 30
amps.
3.2.1 Replacing
Modules
I/O-EA, I/O-EB modules can be replaced and
reprogrammed without having to connect a
computer to the vehicle.
Set the ignition switch to the ON position and
leave it in that position at all time while
performing this procedure.
1. On rear electrical junction panel, trip circuit
breaker CB6.
2. Replace the defective module.
3. Reset circuit breaker CB6. Doing so will
initiate the I/O auto programming.
4. The DID
AUTOPROGRAMMING
PLEASE WAIT" until the reprogramming is
complete unless a higher priority message
must be displayed. If this is the case, press
ESCape button repeatedly to acknowledge
the higher priority messages.
5. The previous message displayed on the DID
may disappear event if the programming is
not completed. For this reason, wait another
5 minutes before proceeding to the next step.
6. Trip and reset circuit breaker CB6.
7. Check the Diagnostics menu of the Driver
Information Display (DID). Select VIEW
ACTIVE FAULTS and. Verify the fault
message to be certain the module is
reprogrammed. If
reprogrammed, the
Responding" appears where Axx is the
module number (Ex: A41, A42...etc).
I/O-EA or I/O-EB
indicates "MUX
I/O MODULE
the module is not
message "Axx Not