PINPOINT TEST K : Incorrect or Erratic Direction of Airflow From Outlets: Notes
Refer to AUTOMATIC CLIMATE CONTROL SYSTEM for schematic and connector information.
Normal Operation and Fault Conditions
To rotate the defrost/panel/floor mode door actuator, the HVAC module supplies voltage and ground to the defrost/panel/floor mode door actuator motor through the actuator motor circuits. To reverse the defrost/panel/floor mode door actuator rotation, the HVAC module reverses the voltage and ground circuits.
The defrost/panel/floor mode door actuator feedback resistor is supplied a 5-volt reference voltage and ground from the HVAC module. The HVAC module measures the resistance on the defrost/panel/floor mode door actuator feedback circuit to determine the defrost/panel/floor mode door actuator position by the position of the actuator feedback resistor wiper arm.
During an actuator calibration cycle, the HVAC module drives the defrost/panel/floor mode door until the door reaches both internal stops in the HVAC case. If the defrost/panel/floor mode door is temporarily obstructed or binding during a calibration cycle, the HVAC module may interpret this as the actual end of travel for the door. When this condition occurs and the HVAC module commands the actuator to its end of travel, the airflow may not be from the expected outlets.
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B1086:11 | Air Distribution Damper Motor: Circuit Short to Ground | This CMDTC sets when the HVAC module senses a short to ground on an actuator motor circuit when voltage is applied to drive the motor. |
| B1086:12 | Air Distribution Damper Motor: Circuit Short to Battery | This CMDTC sets when the HVAC module senses a short to voltage on the actuator motor circuit when ground is applied to drive the motor. |
| B1086:13 | Air Distribution Damper Motor: Circuit Open | This CMDTC sets when the HVAC module senses an open on the actuator motor circuit when ground is applied to drive the motor. |
| B11E7:11 | Air Distribution Damper Position Sensor: Circuit Short to Ground | This CMDTC sets when the HVAC module senses less than expected voltage on the actuator feedback circuit, indicating a short to ground. |
| B11E7:15 | Air Distribution Damper Position Sensor: Circuit Short to Battery or Open | This CMDTC sets when the HVAC module senses greater than expected voltage on the actuator feedback circuit, indicating an open circuit or a short to voltage. |
Possible Sources
- Wiring, terminals or connectors
- Defrost/panel/floor mode door actuator
- HVAC module
- FCIM
- Defrost/panel/floor mode door binding or stuck