B-4 Multiplex Troubleshooting
PA-1628Operator's ManualH3-45 COACH
Problem / Symptom Probable Causes Actions
Entrance door does not
open nor close using the
control buttons
Defroster fan not functioning
Windshield wipers not
functioning in speed 1 or
intermittent
Module AE47 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 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
Windshield wipers not
functioning in speed 1 or
intermittent
No power on R27 Check CB48 (VECF)
HVAC condenser fans not
functioning in speed 1
Circuit breaker CB7 tripped Check / reset circuit breaker CB7
HVAC condenser fans not
functioning in speed 2
Circuit breaker CB7 tripped Check / reset circuit breaker CB7
Check / replace fuse F135
Windshield washer not
functioning
Windshield upper section
de- icing system not
functioning
Module AE44 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 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.
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