Fans Low Speed
| Special functions/Engine Output Control/Fan Relays
| This function operates the engine cooling fan at low speed by enabling the fan low speed relay. The normal commanded state of the relay is None. When commanded ON/OFF, both cooling fans turn ON/OFF. The system remains in the commanded state until cancelled
by the scan tool. The ECM allows relay control when the following conditions are met:
| • | The ignition is ON, with the engine OFF. |
| • | The transmission must be in Park or Neutral. |
| • | The A/C request is OFF. |
| • | The engine coolant temperature is less than a predetermined value. |
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Fans High Speed
| Special functions/Engine Output Control/Fan Relays
| This function operates the engine cooling fan at high speed by enabling the fan high speed relay. The normal commanded state of the relay is None. When commanded ON/OFF, the cooling fan turns ON/OFF. The system remains in the commanded state until cancelled
by the scan tool. The ECM allows relay control when the following conditions are met:
| • | The ignition is ON, with the engine OFF. |
| • | The transmission must be in Park or Neutral. |
| • | The A/C request is OFF. |
| • | The engine coolant temperature is less than a predetermined value. |
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