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RS & RG with ATC

WARNING: This page is about a different car, the 2004 Dodge Grand Caravan, 2004 Dodge Caravan, and 2004 Chrysler Town & Country. However, it is still accessible from the selected car via links, so may be relevant.

Upon power up (Power switch on), the Automatic Temperature Control (ATC) Module sends a blower relay on request to the FCM over the PCI Bus. The front blower relay and the rear blower relay, if equipped, are then powered through low side control through FCM pin 30. The relay provides the high side to the Blower Motor Power Module, and the blower speed is governed through control in the ATC Module. This circuit is electronically controlled and continuously monitored for malfunctions.

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