HVAC - Manual

Diagnostic System Check - HVAC Systems - Manual

Test Description

The numbers below refer to the step numbers on the diagnostic table.
3. Lack of communication may be due to a partial malfunction of the class 2 serial data circuit or due to a total malfunction of the class 2 serial data circuit. The specified procedure will determine the particular condition.
4. This step determines if the engine control module (ECM) has set any DTCs related to the HVAC system.