B0209 – Rear Blower Motor Speed Range/Performance

B0209 Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

B0209 Possible Causes

Faulty Auxiliary (Rear) Blower Motor,Auxiliary (Rear) Blower Motor harness is open or shorted,Auxiliary (Rear) Blower Motor circuit poor electrical connection,Faulty Auxiliary Blower Motor Control Module,Faulty Heating, Ventilation, and Air Conditioning (HVAC)

B0209 Description

The Auxiliary Blower Motor Control Module is an interface between the Heating, Ventilation, and Air Conditioning (HVAC) Control Module and the Auxiliary (Rear) Blower Motor. The auxiliary blower motor control module has 5 circuits: a B+ input, ground, a control signal from the HVAC module, a B+ output and a low side Pulse Width Modulation (PWM) control to the Auxiliary (Rear) Blower Motor. The HVAC control module provides a low side (PWM) signal to the auxiliary blower motor control module in order to request the auxiliary blower motor speed. The auxiliary blower motor control module grounds the blower motor using a low side PWM signal in order to vary the auxiliary blower motor speed.