PINPOINT TEST P : The Temperature Control Is Inoperative or Does Not Operate Correctly - LH: Notes
Refer to AUTOMATIC CLIMATE CONTROL SYSTEM for schematic and connector information.
Normal Operation and Fault Conditions
To rotate the temperature blend door actuator, the HVAC module supplies voltage and ground to the temperature blend door actuator through the door actuator motor circuits. To reverse the temperature blend door actuator rotation, the HVAC module reverses the voltage and ground circuits.
The temperature blend door actuator feedback resistors are supplied a ground from the HVAC module by the temperature blend door actuator return circuits and a 5-volt reference voltage on the temperature blend door actuator reference circuits. The HVAC module reads the voltage on the temperature blend door actuator feedback circuits to determine the temperature blend door actuator position by the position of the actuator feedback resistor wiper arm.
During an actuator calibration cycle, the HVAC module drives the temperature blend door until the door reaches both internal stops in the HVAC case. If the temperature blend 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 the expected temperature.
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B1081:11 | Left Temperature 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. |
| B1081:12 | Left Temperature 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. |
| B1081:13 | Left Temperature 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. |
| B11E5:11 | Left HVAC 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. |
| B11E5:15 | Left HVAC 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
- Temperature blend door actuator
- Temperature blend door is binding or stuck
- HVAC module
- FCIM