B0164

DTC B0164

Circuit Description

The inside air temperature sensor assembly allows the HVAC control module to monitor the temperature of the air inside the passenger compartment. The module applies 5 volts to internal input resistors that are connected to the signal circuit of the inside air temperature sensor assembly. The module provides ground to the inside air temperature sensor assembly through the low reference circuit. The HVAC control module monitors the voltage drop across the inside air temperature sensor assembly and uses the input for automatic control calculations. When the air temperature is cold, the resistance of the sensor is high and the voltage signal is high. When the air temperature is hot, the resistance of the sensor is low and the voltage signal is low.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B0164 Passenger Compartment Temperature Sensor Circuit Range/Performance

Conditions for Running the DTC

* Battery voltage to the HVAC control module is greater than 8.7 volts and less than 16.5 volts.
* The ignition is turned ON.

Conditions for Setting the DTC

The HVAC control module determines that the voltage applied to the input for the inside air temperature sensor assembly is less than 0.09 volt or greater than 4.9 volts.

Action Taken When the DTC Sets

The HVAC control module uses a default value of 55°C (131°F) for the Inside Air Temp. parameter. This value will be displayed on the scan tool.

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 100 fault-free ignition cycles.
* The DTC can be cleared with a scan tool.

Diagnostic Aids

If the condition is not present, refer to Testing for Intermittent Conditions and Poor Connections in Diagnostic Aids. Component Tests and General Diagnostics

Test Description

Step 1 - Step 11:

The number below refers to the step number on the diagnostic table.
2. This step verifies that the condition that set the DTC is present.