SECTION 22: HEATING AND AIR CONDITIONING
DOB 2490-2789 | X3-45 Commuter PA1605 Maintenance Manual (Final Version – Rev.2 April 2016)
17
Problem/Symptom
Probable Causes
Actions
available in the driver’s area
Bad wiring
Diagnostics and Electrical System. The
message “No Response ModA46, Active”
indicates a power problem on the module.
(A CAN network problem would show the
same message but doesn't produce these
symptoms).
2. Check / reset circuit breaker CB1
3. Check fuse CB12V or CB13V (VECF)
4. Probe gray connector on module to see if
it is powered.
The A/C compressor clutch
does not engage
Module A52 is not powered or is
faulty
1. Check the Diagnostics menu of Driver
Information Display (DID). Select Fault
Diagnostics and Electrical System. The
message “No Response ModA52, 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 CB65V (VECR)
4. Probe gray connector on module to see if
it is powered.
Evaporator fan not
functioning
Circuit breaker CB3 tripped
Module A54 is not powered or is
faulty
1. Check / reset circuit breaker CB3
2. Check the Diagnostics menu of Driver
Information Display (DID). Select Fault
Diagnostics and Electrical System. The
message “No Response ModA54, Active”
indicates a power problem on the module.
(A CAN network problem would show the
same message but doesn't produce this
symptom).
3. Check / reset circuit breaker CB5
4. Check
CB67
5. Probe gray connector on module to see if
it is powered.
6. Check / replace condenser power relay
R12 (probe R12 coil power circuit 67,
should be 24 volts).
