B0160

DTC B0160

CIRCUIT DESCRIPTION
The ambient air temperature 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. 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 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.

CONDITIONS FOR RUNNING THE DTC
The ignition is turned ON.

CONDITIONS FOR SETTING THE DTC

B0160: The HVAC control module detects the ambient air temperature sensor signal circuit is less than 2 counts for more than 30 seconds.

B0162: The HVAC control module detects the ambient air temperature sensor signal circuit is more than 253 counts for more than 30 seconds.

ACTION TAKEN WHEN THE DTC SETS
The driver information center 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

Steps 1-4:

Steps 5-8:

Steps 9-13:

The numbers below refer to the step numbers on the diagnostic table.
3. Tests for the proper operation of the circuit in the high voltage range.
4. 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.