• Perform the Diagnostic System Check prior to using this diagnostic procedure:Diagnostic System Check - Vehicle
• Review the description of Strategy Based Diagnosis:Strategy Based Diagnosis
• An overview of each diagnostic category can be found here:Diagnostic Procedure Instructions

For an overview of the component/system, refer to:Instrument Panel Description

• Battery Voltage=Greater than 10.1 V
• Propulsion System Status=Off—Greater than 4 h
• Air Conditioning System=Off—Greater than 4 h
• Ignition » On / Vehicle » In Service Mode
• Air Conditioning System=No DTCs Stored
• DTC P0111-P0119, P0CED, P0072, P0073, U0100 = Not set

• Ignition » On / Vehicle » In Service Mode
• Battery Voltage=Greater than 10.1 V

The difference between the following parameters is greater than a predefined value:Ambient Air Temperature Sensor Signal&Air Conditioning High Side Pressure Switch Signal=Greater than 25°C (77°F)

Ambient Air Temperature Sensor Signal=Greater than 88°C (190°F)

Ambient Air Temperature Sensor Signal=Less than -40°C (-40°F)

Ambient Air Temperature Sensor Signal=Intermittent

• DTCs listed in the DTC Descriptor category=Type B DTC
• The DIC will display SERVICE A/C SYSTEM.

  Air Conditioning System=Disabled

• The control module uses default replacement values.

The conditions for setting the DTC no longer exist.

The displayed temperature is a filtered value that updates periodically while driving. The value rarely changes when the vehicle is parked.

For an overview of the component/system, refer to:Instrument Panel Description

Instrument Cluster Schematics

Master Electrical Component List

Instrument Panel Description

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

Control Module References

1. Ignition » On / Vehicle » In Service Mode
2. Verify no other DTCs are set.
• If any other DTCs are set

  Diagnose other DTCs first.

• If no other DTCs are set
3. Verify DTC P0072, P0073, P0074 is not set
• If DTC P0072, P0073, P0074 is set

  Refer to: Circuit/System Testing

• If DTC P0072, P0073, P0074 is not set
4. Verify the scan tool parameter:Ambient Air Temperature=-40 to 88°C (-40 to 190°F) and changes
• If not between -40 and 88°C (-40 and 190°F) or does not change

  Refer to: Circuit/System Testing

• If between -40 and 88°C (-40 and 190°F) and changes
5. Verify HVAC system operates properly. Refer to:Symptoms - HVAC Systems - Automatic

1. Place the B9 Ambient Air Temperature Sensor in a stable, temperature-controlled area for at least 10 minutes, then measure the resistance between sensor signal terminal A (or 1) and the low reference circuit terminal B (or 2).
2. Compare the readings with the Ambient Air Temperature Sensor Resistance
• If not in the specified range

  Replace the component:B9 Ambient Air Temperature Sensor

• If in the specified range
3. All OK.

Note: It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

1. Ignition/Vehicle & All vehicle systems » Off
2. Disconnect the electrical connector:B9 Ambient Air Temperature Sensor
3. Test for less than 10 Ω between the test points:Low Reference circuit terminal 2 and ground.
• If 10 Ω or greater
1. Disconnect the electrical connector:Disconnect electrical harness connector X1 at the K16 Battery Energy Control Module.
2. Test for less than 2 Ω between the test points:Low Reference circuit terminal 2@Component harness&The other end of the circuit.
• If 2 Ω or greater » Repair the open/high resistance in the circuit.
• If less than 2 Ω » Replace the component:K16 Battery Energy Control Module
• If less than 10 Ω
4. Ignition » On / Vehicle » In Service Mode
5. Verify the scan tool parameter:Ambient Air Temperature=Less than -34°C (-30°F)
• If -34°C (-30°F) or warmer
1. Ignition/Vehicle » Off
2. Disconnect electrical harness connector X1 at the K16 Battery Energy Control Module.
3. Test for infinite resistance between the test points:Signal circuit terminal 1 at the component harness and ground.
• If less than infinite resistance » Repair the short to ground on the circuit.
• If infinite resistance » Replace the component:K16 Battery Energy Control Module
• If -35°C (-31°F) or colder
6. Connect a 3 A fused jumper wire between the test points:Signal circuit terminal 1&Low Reference circuit terminal 2.
7. Verify the scan tool parameter:Ambient Air Temperature=Greater than 143°C (290°F)
• If 143°C (290°F) or colder
1. Ignition/Vehicle » Off & Remove » Jumper wire(s)
2. Disconnect electrical harness connector X1 at the K16 Battery Energy Control Module.
3. Ignition » On / Vehicle » In Service Mode
4. Test for less than 1 V between the test points:Signal circuit terminal 1 at the component harness and ground.
• If 1 V or greater » Repair the short to voltage on the circuit.
• If less than 1 V
5. Ignition/Vehicle » Off
6. Test for less than 2 Ω between the test points:Signal circuit terminal 1 at the component harness and the other end of the circuit.
• If 2 Ω or greater » Repair the open/high resistance in the circuit.
• If less than 2 Ω » Replace the component:K16 Battery Energy Control Module
• If 144°C (291°F) or warmer
8. Connect the component:B9 Ambient Air Temperature Sensor
9. Operate the vehicle within the Conditions for Running the DTC.
10. Verify the DTC does not set.
• If the DTC sets

  Replace the component:B9 Ambient Air Temperature Sensor

• If the DTC is not set
11. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

• Displays and Gauges Component Replacement Reference
• Control Module References for control module replacement, programming and setup