PREVOST H3-45 2023 Operator's Manual page 250

B-4 Multiplex Troubleshooting
Problem / Symptom
Entrance door does not
open nor close using the
control buttons
Defroster fan
functioning
Windshield wipers not
functioning in speed 1 or
intermittent
Windshield wipers not
functioning in speed 1 or
intermittent
HVAC condenser fans
not functioning in speed 1
HVAC condenser fans
not functioning in speed 2
Windshield washer not
functioning
Windshield upper section
de- icing system
functioning
Probable Causes
Module AE47 is not powered
or is faulty
not
No power on R27
Circuit breaker CB7 tripped
Circuit breaker CB7 tripped
Module AE44 is not powered
or is faulty
not
PA-1652 Operator's Manual H3-45 Coach
Actions
1. Check the DIAGNOSTICS menu of Driver
Information Display (DID). Select VIEW
ACTIVE FAULTS and ELECTRICAL. The
message "No Response ModA47, Active"
indicates a power problem on the module. (A
DL0 (BBUS MUX) 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 CB7
Check / reset circuit breaker CB7
Check / replace fuse F135
1. Check the DIAGNOSTICS menu of Driver
Information Display (DID). Select VIEW
ACTIVE FAULTS and ELECTRICAL. The
message "No Response ModA44, Active"
indicates a power problem on the module. (A
DL0 (BBUS MUX) network problem would
show the same message but doesn't produce
these symptoms).
2. Check / reset circuit breaker CB1
3. Check / replace fuse F44
4. Probe gray connector on module to see if it is
powered.