Fan Relay 1

Fan Relays

The scan tool displays a Commanded State of OFF or ON. This allows you to communicate with the ECM and activate or deactivate the cooling fan 1 relay, manually turning the low speed fans ON and OFF.

Fan Relays 2 and 3

Fan Relays

The scan tool displays a Commanded State of OFF or ON. This allows you to communicate with the ECM to activate or deactivate the cooling fan 2 relay and the cooling fan 3 relay. This turns the high speed fans ON and OFF.

Fan Relays 1, 2 and 3

Fan Relays

The scan tool displays a commanded state of OFF or ON. This allows you to communicate with the ECM to activate or deactivate the cooling fan 1 relay, manually turning the low speed fans ON. After a 3 second delay the ECM will activate the cooling fan 2 relay and the cooling fan 3 relay. This turns the high speed fans ON and OFF.