Circuit Description
The inside air temperature sensor is contained within the HVAC control module. The replacement of the inside air temperature sensor involves the replacement of the HVAC control module. The inside air temperature sensor provides the HVAC control module with the temperature of the air drawn through an aspirator from the passenger compartment across a sensor. 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. Passenger Compartment Temp Sensor 1 Circuit refers to the inside air temperature sensor.
DTC Descriptor
This diagnostic procedure supports the following DTC.
DTC B0164 Passenger Compartment Temp Sensor Circuit Range/Performance
This vehicle has DTCs which include DTC Symptoms. For more information on DTC Symptoms, refer to DTC Symptom Description in Vehicle DTC Information.
DTC Symptom | DTC Symptom Descriptor |
|---|---|
05 | Short to Battery or Open |
06 | Short to Ground or Open |
Conditions for Running the DTC
The ignition is turned ON.
Conditions for Setting the DTC
B0164 05 and 06
The HVAC control module detects the inside air temperature sensor signal circuit is less than 2 counts or greater than 253 counts for 30 seconds.
Action Taken When the DTC Sets
B0164 05 and 06
If the DTC sets due to the low condition, the HVAC control module will default to maximum cooling, except when the maximum heating setting is selected. If the DTC sets due to the high condition, the HVAC control module will default to maximum heating, except when the maximum cooling setting is selected.
Conditions for Clearing the DTC
| • | The DTC will become history if the HVAC control module no longer detects a condition. |
| • | The history DTC clears after 40 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 Wiring Systems.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: HVAC Schematics Connector End View Reference: HVAC Connector End Views | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 |
Does the scan tool indicate the DTC is current? | Go to Step 3 | Go to Diagnostic Aids |
3 | Test the ignition 3 voltage circuit of the HVAC control module for an open or a high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 7 | Go to Step 4 |
4 | Test the ground circuit of the HVAC control module for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 7 | Go to Step 5 |
5 | Inspect for poor connections at the harness connector of the HVAC control module. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 7 | Go to Step 6 |
6 |
Important: Perform the recalibration procedure for the HVAC control module after the replacement procedure. Refer to Actuator Recalibration . Replace the HVAC control module. Refer to HVAC Control Module Replacement . Did you complete the replacement? | Go to Step 7 | -- |
7 |
Does the DTC set again? | Go to Step 2 | System OK |
