PREVOST H3-45 - Page 260

B-6 Multiplex Troubleshooting
PA-1628Operator's ManualH3-45 COACH
Problem / Symptom Probable Causes Actions
Rear flashers not
functioning
Stoplights and center
stoplights not functioning
Module AE51 is not powered or
is faulty
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.
Engine is overheating and
radiator fans do not engage
Module AE52 or AE49 is not
powered or is faulty
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
The A/C compressor clutch
does not engage
Module AE54 (or AE52) is not
powered or is faulty
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.