PREVOST X3-45 VIP 2017 Owner's Manual page 195

Appendix B - Troubleshooting Guide for Multiplex Vehicles
Problem/Symptom
The A/C compressor
clutch does not engage
Evaporator fan not
functioning
HVAC condenser fans not
functioning in speed 1
Probable Causes
Module AE54 is not powered
or is faulty
Circuit breaker CB3 tripped
Module AE54 is not powered
or is faulty
Module AE54 is not powered
or is faulty
Actions
1. Check the SYSTEM DIAGNOSTIC
menu of Driver Information Display
(DID). Select FAULT DIAGNOSTIC
and ELECTRICAL
message "No Response
Active" indicates a power problem on
the module. (A CAN 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.
1. Check circuit breaker CB3
2. Check relay R12
3. Check the SYSTEM DIAGNOSTIC
menu of Driver Information Display
(DID). Select FAULT DIAGNOSTIC
and ELECTRICAL
message "No Response
Active" indicates a power problem on
the module. (A CAN network problem
would show the same message but
doesn't produce this symptom).
4. Check / reset circuit breaker CB5
5. Check / replace fuse F135
6. Probe gray connector on module to
see if it is powered.
1. Check the SYSTEM DIAGNOSTIC
menu of Driver Information Display
(DID). Select FAULT DIAGNOSTIC
and ELECTRICAL
message "No Response
Active" indicates a power problem on
the module. (A CAN 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. Check / replace fuse F141-F144
5. Probe gray connector on module to
see if it is powered.
5
SYSTEM. The
ModA54,
SYSTEM. The
ModA54,
SYSTEM. The
ModA54,