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For 1990-2009 cars only
Makes 🢒 Generic 🢒 2005 🢒 Unit Repair 🢒 Vehicle Control Systems 🢒 Vehicle DTC Information 🢒 DTC B0158

Circuit Description

The body control module (BCM) monitors the outside air temperature sensor. The temperature sensor is a 2-wire negative temperature co-efficient thermistor. The BCM applies 5 volts to an internal input resistor that is connected to the signal circuits of the Outside air temperature sensor. The BCM provides the ground to the outside air temperature sensor through the low reference circuit. The BCM monitors the voltage drop across the Outside air temperature sensor and uses the input for automatic control calculations. When the outside 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. The BCM converts the voltage value to a temperature value to be displayed by the driver information center (DIC). The DIC is located in the radio. The outside air temperature is displayed by the instrument panel cluster (IPC) in the DIC.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B0158 Outside Air Temperature Sensor

This vehicle has DTCs which include DTC Symptoms. For more information on DTC Symptoms, refer to DTC Symptom Description .

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 ON.

Conditions for Setting the DTC

The BCM detects the sensor signal circuit is less than 0.1 volt or more than 4.9 volts.

Conditions Taken When the DTC Sets
    • The default value of 3°C (38°F) will be substituted for the outside air temperature sensor data by the BCM.
    • The DIC will display the set temperature when ON.

Conditions for Clearing the DTC
    • The DTC will become history if the BCM no longer detects a failure.
    • The history DTC will clear after 40 fault-free ignition cycles.
    • The DTC can be cleared by using a scan tool.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. The operating range of the sensor is between 0.1-4.9 volts. If the scan tool displays a value less than 0.1 volt or greater than 4.9 volts, then the sensor is performing outside of its designed limits.

    2.

  2. Tests for the proper operation of the circuit in the high voltage range.

    3.

  3. 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.

    4.

  4. Test the signal circuit for a short to ground.

    5.

  5. Tests the signal circuit for a short to voltage, a high resistance, or an open.

    6.

  6. Tests the low reference circuit for a high resistance or an open.

Step

Action

Values

Yes

No

Schematic Reference: HVAC Schematics , Instrument Cluster Schematics or Body Control System Schematics

Connector End View Reference: HVAC Connector End Views

1

Did you perform the Diagnostic System Check - Vehicle?

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Go to Step 2

Go to Diagnostic System Check - Vehicle

2

  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, observe the Outside Air Temperature Sensor parameter in the body control module (BCM) data list.

Does the scan tool indicate that the Temperature Sensor parameter is within the specified range?

0.1-4.9 V

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

3

  1. Turn OFF the ignition.
  2. Disconnect the outside air temperature sensor.
  3. Turn ON the ignition, with the engine OFF.
  4. With a scan tool, observe the Outside Air Temperature Sensor parameter in the BCM data list.

Does the scan tool indicate that the temperature sensor parameter is more than the specified value?

4.9 V

Go to Step 4

Go to Step 5

4

  1. Turn OFF the ignition.
  2. Connect a 3-amp fused jumper wire between the outside air temperature sensor signal circuit and the low reference circuit of the outside air temperature sensor.
  3. Turn ON the ignition, with the engine OFF.
  4. With a scan tool, observe the Outside Air Temperature parameter in the BCM data list.

Does the scan tool indicate that the temperature sensor parameter is less than the specified value?

0.1 V

Go to Step 8

Go to Step 6

5

Test the signal circuit of the outside air temperature sensor for a short to ground. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

--

Go to Step 12

Go to Step 9

6

Test the signal circuit of the outside air temperature sensor for a short to voltage, a high resistance, or an open. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

--

Go to Step 12

Go to Step 7

7

Test the low reference circuit of the outside air temperature sensor for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

--

Go to Step 12

Go to Step 9

8

Inspect for poor connections at the harness connector of the outside air temperature sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

--

Go to Step 12

Go to Step 10

9

Inspect for poor connections at the harness connector of the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

--

Go to Step 12

Go to Step 11

10

Replace the outside air temperature sensor. Refer to the Ambient Air Temperature Gage Sensor Replacement .

Did you complete the replacement?

--

Go to Step 12

--

11

Replace the BCM. Refer to Control Module References for replacement, setup, and programming.

Did you complete the replacement?

--

Go to Step 12

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12
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.

Does the DTC reset?

--

Go to Step 2

System OK