Blower Motor: Description and Operation

Air Flow:

BLOWER SPEED CONTROL
For every given program number and climate control panel setting, the Body Control Module (BCM) has a calculated blower motor voltage.

Based on a signal sent from the BCM, the programmer sends a variable voltage to the power module which is then amplified and sent to the blower motor. The programmer monitors the blower voltage so that the signal can be adjusted to achieve the desired blower motor speed.