Engine Cooling Fan Control

The Engine Cooling Fan control is partitioned between the Powertrain Control Module (PCM) and the Body Function Controller (BFC) via Class 2. The main algorithm control resides in the Body Function Controller (BFC). The Body Function Controller (BFC) sends a fan speed command to the Powertrain Control Module (PCM). The Powertrain Control Module (PCM) processes this command along with its own fan request and determines what the actual fan speed should be.