PREVOST H3-45 2023 Operator's Manual page 251

Problem / Symptom
Defroster fan is
functioning but no heat or
cooling available in the
driver area.
Low beam headlamps
and front flasher on left
side not functioning
Electric horn not
functioning
Low beam headlamps
and flasher on right side
not functioning
Probable Causes
Module AE47 is not powered
or is faulty
Module AE46 is not powered
or is faulty
Module AE48 is not powered
or is faulty
PA-1652 Operator's Manual H3-45 Coach
Multiplex Troubleshooting B-5
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.
1. Check the DIAGNOSTICS menu of Driver
Information Display (DID). Select VIEW
ACTIVE FAULTS and ELECTRICAL. The
message "No Response ModA46, 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 CB10
3. Check / replace fuse F19
4. 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 ModA48, 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 CB10
3. Check / replace fuse F21
4. Probe gray connector on module to see if it is
powered.