Test B: The Air Inlet Door Is Inoperative
PINPOINT TEST B: THE AIR INLET DOOR IS INOPERATIVENormal Operation
Under normal operation, the air inlet (recirc) door actuator motor is supplied voltage or ground on circuit CH208 (GN/OG), depending on desired actuator rotation, by the HVAC module. The HVAC module then supplies the appropriate voltage or ground to the other side of the actuator motor on circuit CH207 (BU/GY).
- DTC B12A8 Recirc Door Actuator, Drive Circuit(s) Open or Shorted to Ground - The module senses no voltage on the door actuator drive circuit(s), indicating an open circuit or a short directly to ground.
- DTC B12A9 Recirc Door Actuator, Drive Circuit(s) Shorted to Battery Voltage - The module senses voltage on the door actuator drive circuits, indicating a short directly to voltage.
- DTC B12AA Recirc Door Actuator, Slow or Door Obstructed - The module senses no change in actuator feedback voltage when the actuator motor has been energized.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Air inlet door actuator
- HVAC module
- Stuck or damaged linkage or door
B1-B3:
