PINPOINT TEST B : The Auxiliary Blower Motor Does Not Operate Correctly: Notes

Diagnostic Overview 

The Auxiliary Blower Motor Does Not Operate Correctly 

Refer to AUXILIARY CLIMATE CONTROL SYSTEM for schematic and connector information.

Normal Operation and Fault Conditions 

The auxiliary blower motor relay coil receives a ground from the HVAC module. When the relay coil is energized, voltage is delivered from the relay to the auxiliary blower motor speed control and auxiliary blower motor. The auxiliary blower motor speed control is grounded. The HVAC module provides a PWM signal to the auxiliary blower motor speed control to control the blower speed. Ground for the motor is provided from the auxiliary blower motor speed control.

DTC Fault Trigger Conditions