Cooling Fan Control
WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
The engine cooling fan system consists of one cooling fan and two relays. Voltage is supplied to the relays through the 30A MAIN FAN and 30 A AUX FAN fuses. The engine control module (ECM) controls the low speed fan operation by grounding the AUX FAN relay control circuit. When the AUX FAN relay, which is the low speed relay, is energized, voltage is delivered to the cooling fan Cooling Fan Resistor. The ECM controls the high speed fan operation by grounding the MAIN FAN relay, which is the high speed relay, control circuit. When the MAIN FAN relay is energized, voltage is delivered directly to the cooling fan. The cooling fan motor is grounded through its own ground circuit.