B0160

DTC B0160 or B0162

Circuit Description

The ambient air temperature (AAT) sensor provides the HVAC control module software with the temperature of the air outside the vehicle. That temperature can be displayed in the driver information center (DIC). A reference voltage is supplied to the sensor thermistor and the HVAC control module determines the voltage drop across that device, which is proportional to the temperature. As the air temperature increases, the resistance decreases, and the voltage signal decreases. As the air temperature decreases, the resistance increases, and the voltage signal increases.

DTC Descriptors

This diagnostic procedure supports the following DTCs:

* DTC B0160 Outside Air Temperature Sensor Circuit Low
* DTC B0162 Outside Air Temperature Sensor Circuit Open or High

Conditions for Running the DTC

The ignition is turned ON.

Conditions for Setting the DTC

B0160

The HVAC control module detects the AAT sensor signal circuit is less than 2 counts for more than 30 seconds.

B0162

The HVAC control module detects the AAT sensor signal circuit is more than 253 counts for more than 30 seconds.

Action Taken When the DTC Sets

The DIC will display 15°C (59°F) for outside air temperature.

B0160

The system operates using a default value of 15°C.

B0162

The system operates using a default value of 15°C.

Conditions for Clearing the DTC

* The DTC will become history if the HVAC control module no longer detects the condition that set the DTC.
* The history DTC will clear after 50 fault-free ignition cycles.
* The DTC can be cleared with a scan tool.

Test Description

Step 1 - Step 11:

Step 12 - Step 13:

The numbers below refer to the step numbers on the diagnostic table.
3. This step tests for the proper operation of the circuit in the high voltage range.
4. This step tests for the proper operation of the circuit in the low voltage range. If the fuse in the jumper opens when you perform this test, the signal circuit is shorted to voltage.