Test Step 3 - Verify that the HVAC Control Module is Active on The Bus

• Turn the ignition ON.
• With the scan tool, select network diagnostics.
• Verify the HVAC control module is active on the bus.

Is the HVAC Active On The Bus?

Yes

• Go to Test Step 4 Test Step 4 - Test for Additional Communication Related DTCs .

No

• Perform the No Response diagnostic procedure. Refer to NO RESPONSE FROM A/C HEATER CONTROL MODULE .