Hi Blower Only

Chart:

Schematic:

CIRCUIT DESCRIPTION
Based on a signal sent from the Body Control Module (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.

TEST DESCRIPTION
1. This step checks to see if the fault is due to an open feedback circuit or a faulty blower signal.
2. This step checks to see if the fault is due to the programmer and circuitry or the BCM circuitry.