PREVOST H3-45 2023 Operator's Manual page 253

Problem / Symptom
Evaporator fan not
functioning
HVAC condenser fans
not functioning in speed 1
Sound system not
functioning
Probable Causes
Circuit breaker CB3 tripped
Module AE54 is not powered
or is faulty
Module AE54 is not powered
or is faulty
Circuit breaker CB11 tripped 1. Check CB11
PA-1652 Operator's Manual H3-45 Coach
Multiplex Troubleshooting B-7
Actions
1. Check circuit breaker CB3
2. Check relay R12
3. Check the DIAGNOSTICS menu of Driver
Information Display (DID). Select VIEW
ACTIVE FAULTS and ELECTRICAL. The
message "No Response ModA54, Active"
indicates a power problem on the module. (A
DL0 (BBUS MUX) network problem would
show the same message but doesn't produce
this symptom).
4. Check / reset circuit breaker CB5
5. Check / replace fuse F135
6. Probe gray connector on module to see if it is
powered.
1. Check the DIAGNOSTICS menu of Driver
Information Display (DID). Select VIEW
ACTIVE FAULTS and ELECTRICAL. The
message "No Response ModA54, Active"
indicates a power problem on the module. (A
DL0 (BBUS MUX) network problem would
show the same message but doesn't produce
this symptom).
2. Check / reset circuit breaker CB5
3. Check / replace fuse F135
4. Check / replace fuse F141-F144
5. Probe gray connector on module to see if it is
powered.
2. Check / replace fuse F148, F200