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 Descriptors
DTC B0158 03: Outside Air Temperature Sensor Circuit Voltage Below ThresholdDTC B0158 06: Outside Air Temperature Sensor Circuit Short to Ground or Open
DTC B0158 07: Outside Air Temperature Sensor Circuit Voltage Above Threshold
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Ambient Air Temperature Sensor Signal | B0158 06 | B0158 06 | B0158 07* | B0158 03, B0158 07 |
Inside Air Temperature Sensor Signal | B0163 06 | B0163 06 | B0163 06* | 1 |
Left Sunload Sensor Signal | B0183 06 | B0183 06 | B0183 06* | 1 |
Right Sunload Sensor Signal | B0188 06 | B0188 06 | B0188 06* | 1 |
Evaporator Temperature Sensor Signal | B3933 06 | B3933 06 | B3933 06* | 1 |
Low Reference | -- | B3933 06, B0158 06, B0163 06 | B3933 06, B0158 07, B0163 06 | B0158 07 |
Sunload Sensors Ground | -- | B0183 06, B0188 06 | B0183 06, B0188 06 | -- |
*If the signal circuit is shorted to voltage B0158, B0163, B0183, B0188 and B3933 will all set. 1. Air Temperature Malfunction | ||||
Circuit/System Description
The HVAC control module supplies the ambient air temperature sensor with a low reference circuit and 5-volt signal circuit. The HVAC control module determines the voltage drop across the sensor, which is proportional to temperature. As the air temperature increases, the sensor resistance decreases. As the air temperature decreases, the sensor resistance increases.
Conditions for Running the DTC
Ignition ON.
Conditions for Setting the DTC
The HVAC control module detects the ambient air temperature sensor signal circuit is less than -36°C (-38°F) or greater than 215°C (419°F) for more than 15 seconds.
Action Taken When the DTC Sets
| • | The HVAC control module will display dashes for outside air temperature. |
| • | The DIC will display SERVICE A/C SYSTEM. |
| • | The system operates using a default value. |
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. |
Diagnostic Aids
If the ambient air temperature sensor has an out of range condition caused by a short to voltage, short to ground, or open/high resistance the scan tool will display the last normal operating range.
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Automatic HVAC Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the ambient air temperature sensor.
- Ignition OFF, test for less than 1 ohm between the low reference circuit terminal B and ground.
- Ignition ON, test for 5 volts between the signal circuit terminal A and the low reference circuit terminal B.
- If all circuits test normal, test or replace the ambient air temperature sensor.
| ⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the HVAC control module. |
| ⇒ | If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the HVAC control module. |
| ⇒ | 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 HVAC control module. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for HVAC control module replacement, setup, and programming |
