Hi and thanks for using ECM
If power is good to the AZC module, then you need to check the module itself. It requires a scanner to check and diagnose. I attached two diagnostic flow charts for you to review. If you don't have the right tooling to do it, you may have to consider having it done.
Here is the listing from the bottom of the diagnostic page:
- Attempt to communicate with the BCM
- Fused (B+) CKT open
- Fused ignition switch output circuit open
- Open PCI bus circuit
- Automatic Zone Control Module
Keep in mind, this type of problem should have set a diagnostic trouble codes related the HVAC system. That would be very helpful, but again, it requires a scanner that can read coding related to it. If you can get those codes, let me know what they are.
Take a look through this and let me know if it helps or if you have questions.
Images (Click to enlarge)
Friday, January 18th, 2019 AT 9:06 PM