Lost Communication With HVAC

LOST COMMUNICATION WITH HVAC





For a complete wiring diagram, refer to the Wiring Information Electrical Diagrams

- When Monitored:
Continuously with the ignition in run.

- Set Condition:
The Gateway module does not receive any messages from the HVAC.





1. ATTEMPT TO COMMUNICATE WITH THE HVAC
1. Turn the ignition on.
2. With the scan tool, select ECU View.
3. Verify that the HVAC is active on the bus.

Is the HVAC active on the bus?

Yes

- Go To 2

No

- Perform the No Response diagnostic procedure. Communications - Verbose Codes

2. CHECK FOR ADDITIONAL COMMUNICATION RELATED DTC'S
1. With the scan tool, select Network View and select Advanced.

Is there more than one module with active DTCs "Logged Against" the HVAC?

Yes

- Replace/update the HVAC.
- Perform the BODY VERIFICATION TEST. Body Verification Test

No

- Replace/update the module that set this DTC.
- Perform the BODY VERIFICATION TEST. Body Verification Test