PREVOST H3-45 2023 Operator's Manual page 252

B-6 Multiplex Troubleshooting
Problem / Symptom
Rear flashers not
functioning
Stoplights and center
stoplights not functioning
Engine is overheating
and radiator fans do not
engage
The A/C compressor
clutch does not engage
Probable Causes
Module AE51 is not powered
or is faulty
Module AE52 or AE49 is not
powered or is faulty
Module AE54 (or AE52) is
not powered or is faulty
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 ModA51, 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 CB8
3. Check / replace fuse F107
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 ModA52/ ModA49,
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 circuit breaker CB5
3. Check / replace fuse F133, F134
4. CB201-CB208
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. Probe gray connector on module to see if it is
powered.