Pinpoint Test D : B1A61:11, B1A61:15, B1A69:11, B1A69:15: Notes
WARNING: This page is about a different car, the 2017 Lincoln Navigator and 2017 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.
Refer to Automatic Climate Control System , for schematic and connector information.
Normal Operation and Fault Conditions
The in-vehicle temperature and humidity sensor receives a ground from the HVAC control module. The sensor varies its resistance with the temperature. As the temperature rises, the resistance falls. As the temperature falls the resistance rises. The HVAC control module measures this resistance to determine the temperature and the humidity at the sensor.
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B1A61:11 | Cabin Temperature Sensor: Circuit Short to Ground | This CMDTC and on demand DTC sets when the HVAC control module senses lower than expected voltage on the sensor feedback circuit, indicating a short to ground. |
| B1A61:15 | Cabin Temperature Sensor: Circuit Short to Battery or Open | This CMDTC and on demand DTC sets when the HVAC control module senses greater than expected voltage on the sensor feedback circuit, indicating a short to voltage or an open circuit or sensor. |
| B1A69:11 | Humidity Sensor: Circuit Short to Ground | This CMDTC and on demand DTC sets when the HVAC control module senses lower than expected voltage on the sensor feedback circuit, indicating a short to ground. |
| B1A69:15 | Humidity Sensor: Circuit Short to Battery or Open | This CMDTC and on demand DTC sets when the HVAC control module senses greater than expected voltage on the sensor feedback circuit, indicating a short to voltage or an open circuit or sensor. |
Possible Sources
- Wiring, terminals or connectors
- In-vehicle temperature and humidity sensor
- HVAC control module