PINPOINT TEST S : The Blower Motor Does Not Operate Correctly: Notes
Refer to AUTOMATIC CLIMATE CONTROL SYSTEM for schematic and connector information.
Normal Operation and Fault Conditions
When the blower motor relay coil receives a ground from the HVAC module, the relay coil is energized and voltage is delivered to the blower motor and the blower motor speed control from the relay. Ground for the motor is provided from the blower motor speed control. Ground is provided for the blower control module. The HVAC module sends a PWM signal to the blower motor speed control to control the blower speed.
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B10B9:12 | Blower Control: Circuit Short to Battery | This CMDTC and on-demand DTC sets when the HVAC module senses excessive voltage on the blower motor control PWM circuit for more than 20 ms. |
Possible Sources
- Wiring, terminals or connectors
- Blower motor speed control
- HVAC module
- FCIM