Captiva

Outside Air Temperature Display Malfunction - DTC B0158

The instrument cluster monitors the ambient air temperature sensor with a low reference circuit and 5 V signal circuit. The instrument cluster monitors the voltage drop across the sensor, which is proportional to temperature. When the ambient air temperatures are cold, the resistance of the sensor is high and the voltage signals are high. When the ambient air temperatures are hot, the resistance of the sensors is low and the voltage signals are low. The instrument cluster converts the voltage value to a temperature value of Celsius or Fahrenheit that will be displayed by the driver information centre.

The system voltage is between 9–16 V.

B0158 02

The instrument cluster detects the sensor signal circuit is more than 88°C (190°F).

B0158 05

The instrument cluster detects the sensor signal circuit is less than -40°C (-40°F).

The instrument cluster uses a default air temperature value for further calculations. The driver information centre displays ---°C ( ---°F).

The DTC will become history if the instrument cluster no longer detects a malfunction.

Schematic Reference

Driver Information System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Instrument Cluster Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, observe the scan tool Outside Air Temperature parameter. The reading should be between -40°C (-40°F) to +88°C (+190°F) and change with air temperature changes.

1. Ignition OFF, disconnect the wiring harness plug at the outside air temperature sensor.
2. Install a 3 A fused jumper wire between the signal circuit terminal 3 and the low reference circuit terminal 1. Verify the scan tool Outside Air Temperature parameter displays greater than 54°C (130°F).

⇒	If less than the specified range, test the low reference circuit a short to voltage or an open/high resistance. If the circuit tests normal, replace the instrument cluster.

3. Ignition ON, test for 4.6-5.4 V between the signal circuit terminal 1 and ground.

⇒	If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the instrument cluster.

⇒	If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the instrument cluster.

4. Verify the accuracy of the outside air temperature sensor. Refer to Ambient Air Temperature Sensor Resistance .

⇒	If not within the specified range, replace the outside air temperature sensor.

5. If all circuits test normal, test or replace the outside air temperature sensor.

Static Test

1. Test the outside air temperature sensor by varying the sensor temperature while monitoring the sensor resistance.
2. Compare the readings with the Ambient Air Temperature Sensor Resistance .

⇒	If not within the specified range, replace the outside air temperature sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedures.