B0413 BUICK - Temperature Control 1 Feedback Circuit
Repair Importance Level:
Repair Difficulty Level:
Possible causes
- Faulty Drivers Air Temperature Actuator
- Drivers Air Temperature Actuator harness is open or shorted
- Drivers Air Temperature Actuator circuit poor electrical connection
Tech notes
DTC B0413 02 - Temperature Control 1 Feedback Circuit Short to GroundDTC B0413 05 - Temperature Control 1 Feedback Circuit Short to Battery or Open
DTC B0413 61 - Temperature Control 1 Feedback Circuit Actuator Stuck Open
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
B0413 Buick Description
The Heating, Ventilation, and Air Conditioning (HVAC) control module controls the HVAC door actuators to regulate the airflow through the HVAC system. Each actuator consists of an electric motor and a potentiometer. The module supplies a low reference and 5-volt reference source voltage to the potentiometer. The HVAC control module monitors the voltage drop across the potentiometer on the door position signal circuit. When the actuator shaft rotates, the voltage on the door position signal circuit changes. The control circuit uses either a 0, 2.5 or 5-volt signal to command the actuator movement. When the actuator is at rest, the control circuit value is 2.5 volts. A 0 or 5-volt control signal commands the actuator movement in opposite directions.