Air Flow Control 10 Feedback Circuit Malfunction
Table of contents
B3782 HUMMER Possible Causes
- Faulty Auxiliary Mode Actuator
- Auxiliary Mode Actuator harness is open or shorted
- Auxiliary Mode Actuator circuit poor electrical connection
- Faulty Auxiliary Heating, Ventilation, and Air Conditioning (HVAC) Control Module
How do I fix code B3782 HUMMER?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Cost of diagnosing the B3782 HUMMER code
The cost of diagnosing the B3782 HUMMER code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
B3782 HUMMER Description
The actuators operate using 5 circuits. A 5-volt reference, low reference, signal circuit and two bi-directional 0 or 12 volt control circuits. The Heating, Ventilation, and Air Conditioning (HVAC) Control Module supplies a low reference and 5-volt reference to the potentiometer. The HVAC control module monitors the voltage drop across the potentiometer on the door position signal circuit. As the actuator door changes position the door position signal circuit voltage also changes. The two bi-directional control circuits enable the actuator to operate. Both circuits are set to 0 volts when the HVAC control module detects, from the feedback potentiometer, that the actuator is in the desired position. In order to move the actuator, the HVAC control module switches the appropriate control circuit to 12 volts.