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Home >> Chevrolet >> 2015 >> Cruze LT, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 28 (HVAC System - Automatic) >> Diagnostic Information and Procedures >> DTC B0193: Front Blower Motor Speed >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different car, the 2015 Buick Encore. However, it is still accessible from the selected car via links, so may be relevant.

The blower motor control module is an interface between the HVAC control module and the blower motor. The blower motor control module has 5 circuits: a B+ input, ground, a control circuit from the HVAC control module, a B+ output to the blower motor, and a low side pulse width modulation (PWM) output. The HVAC control module provides a low side (PWM) signal to the blower motor control module in order to request the blower motor speed. The blower motor control module grounds the blower motor using a low side PWM signal in order to vary the blower motor speed.

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