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Circuit/System Testing

WARNING: This page is about a different car, the 2007 Chevrolet Monte Carlo and 2007 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the OAT sensor.
  2. Ignition OFF, test for less than 1 ohm of resistance between the ground circuit and ground.
    • If greater than 1 ohm, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify the driver information center (DIC) displays approximately -40°F (-40°C).
    • If the DIC does not display approximately -40°F (-40°C), test the OAT sensor signal circuit for a short to ground. If the circuit tests normal, replace the HVAC module.
  4. Ignition ON, scan tool installed, perform an outside air temperature (OAT) Instant Update to bypass the filtering with either a scan tool or by press and holding the AC and RECIRC buttons simultaneously for 2 seconds.
  5. Ignition ON, install a 3-amp fused jumper wire between the signal circuit and the ground circuit of the OAT sensor. Verify the DIC displays approximately 189.5°F (87.5°C).
    • If the DIC does not display approximately 189.5°F (87.5°C), test the signal circuit of the OAT sensor for a short to voltage or an open/high resistance. If the circuit tests normal, replace the HVAC module.
  6. If all circuits test normal, test or replace the OAT sensor.
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