Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptor
DTC B0158 02: Outside Air Temperature Sensor Circuit Short to GroundDTC B0158 05: Outside Air Temperature Sensor Circuit Short to Battery or Open
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Ambient Air Temperature Sensor Signal | B0158 02 | B0158 05 | B0158 05 | -- |
Low Reference | -- | B0158 05 | B0158 05 | -- |
Circuit/System Description
The instrument cluster monitors the ambient air temperature sensor with a low reference circuit and 5-volt 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 center.
Conditions for Running the DTC
The system voltage is between 9 V and 16 V
Conditions for Setting the DTC
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).
Action Taken When the DTC Sets
The instrument cluster uses a default air temperature value for further calculations. The driver information center displays ---°C ( ---°F).
Conditions for Clearing the DTC
The DTC will become history if the instrument cluster no longer detects a malfunction.
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Driver Information Center (DIC) Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Ignition ON, observe the scan tool Ambient Air Temperature parameter. The reading should be between -40°C (-40°F) and 88°C (190°F) and change with air temperature changes.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the B9 Ambient Air Temperature.
- Ignition OFF, test for less than 5 Ω between the low reference circuit terminal 2 and ground.
- Ignition ON, test for 4.8-5.2 V between the signal circuit terminal 1 and ground.
- If all circuits test normal, test or replace the B9 Ambient Air Temperature.
| ⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the P16 Instrument Cluster. |
| ⇒ | If greater than the specified range, test the signal circuit terminal 1 for a short to voltage. If the circuit tests normal, replace the P16 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 P16 Instrument Cluster. |
Component Testing
Static Test
- Test the B9 Ambient Air Temperature by varying the sensor temperature while monitoring the sensor resistance.
- Compare the readings with the Ambient Air Temperature Sensor Resistance and verify that the resistance is within the range of the specification.
| ⇒ | If not within the specified range, replace the B9 Ambient Air Temperature. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for instrument cluster replacement, setup, and programming |
