Auxiliary Blower Motor Control Module

The following are auxiliary blower motor control module circuits:

• Rear blower motor speed control circuit-When the auxiliary blower switch is placed in any speed position this circuit is a pulse width modulated signal that is sent from the Auxiliary HVAC control module to the auxiliary blower motor control module.
• Ground-A constant body ground is supplied to the auxiliary blower motor control module.
• Low reference-This circuit is grounded through the auxiliary blower motor control module only when the auxiliary HVAC control module is in high speed. In all other blower speeds this circuit is a pulse width modulated signal (PWM). The longer this circuit is pulsed the ground the faster the blower speed will be.
• Blower speed feed back signal-This feedback circuit displays in percent on the TECH 2 the commanded output blower speed that the auxiliary blower motor control module is sending to the auxiliary blower motor.