• 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.

The instrument cluster monitors the ambient air temperature sensor with a low reference circuit and signal circuit. The instrument cluster monitors the voltage drop across the sensor, which is inversely proportional to temperature. When the ambient air temperature is cold, the resistance of the sensor is high. When the ambient air temperature is warm, the resistance of the sensors is low. The instrument cluster converts the voltage value to a temperature value and displays the temperature.

The system voltage is between 9–16 V.

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

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

The instrument cluster uses a default air temperature value for further calculations. The instrument cluster will display −°C (−°F).

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

Instrument Cluster Schematics

Component Connector End Views

Instrument Cluster Description and Operation

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

Control Module References for scan tool information

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the B9 ambient air temperature sensor. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 Ω between the low reference circuit terminal B and ground.
• If 10 Ω or greater
1. Ignition OFF, disconnect the harness connector at the P16 instrument cluster.
2. Test for less than 2 Ω in the low reference circuit end to end.
• If 2 Ω or greater, repair the open/high resistance in the circuit.
• If less than 2 Ω, replace the P16 instrument cluster.
• If less than 10 Ω
3. Ignition ON.
4. Verify the scan tool Ambient Air Temperature parameter is greater than 98%.
• If 98% or less
1. Ignition OFF, disconnect the harness connector at the P16 instrument cluster.
2. Test for infinite resistance between the signal circuit terminal A and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the P16 instrument cluster.
• If greater than 98%
5. Install a 3 A fused jumper wire between the signal circuit terminal A and the low reference circuit terminal B.
6. Verify the scan tool Ambient Air Temperature parameter is less than 8%.
• If 8% or greater
1. Ignition OFF, disconnect the harness connector at the P16 instrument cluster, ignition ON.
2. Test for less than 1 V between the signal circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V
3. Ignition OFF
4. Test for less than 2 Ω in the signal circuit end to end.
• If 2 Ω or greater, repair the open/high resistance in the circuit.
• If less than 2 Ω, replace the P16 instrument cluster.
• If less than 8%
7. Test or replace the B9 ambient air temperature sensor.

Perform the Diagnostic Repair Verification after completing the repair.

• Ambient Air Temperature Gauge Sensor Replacement
• Control Module References for instrument cluster replacement, programming and setup