PREVOST H3-41 Maintenance Manual page 206

SECTION 06: ELECTRICAL
Problem/Symptom
Entrance door does not
open nor close using the
control buttons
Defroster fan
functioning
Windshield wipers
functioning in speed 1 or
intermittent
Windshield wipers
functioning in speed 1 or
intermittent
HVAC condenser fans not
functioning in speed 1
HVAC condenser fans not
functioning in speed 2
Windshield washer
functioning
Windshield upper section
de-icing system
functioning
42 PA1621 Maintenance Manual All Series | Revised Sept 2019
Probable Causes
Module AE47 is not powered
or is faulty
not
not
not No power on R27
Circuit breaker CB7 tripped
Circuit breaker CB7 tripped
not Module AE44 is not powered
or is faulty
not
Actions
1. Check the DIAGNOSTICS menu of
Driver Information
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
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.
Display (DID).
Display (DID).