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
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B10BA:12 | Rear Blower Control: Circuit Short to Battery | This CMDTC sets when the HVAC module senses excessive voltage on the blower motor control PWM circuit for more than 20 milliseconds. |