Reconnect all FCIM connectors. Make sure they seat and latch correctly. Operate the system and determine if the concern is still present.
Is the concern still present?
Yes | CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new FCIM. Refer to the appropriate section in Group 415 for the procedure. | |
|---|---|---|
No | The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues. | |
The Blower Motor Does Not Operate Correctly
Refer to Wiring Diagrams Cell 54 for schematic and connector information.
Normal Operation and Fault Conditions
Voltage is supplied to the blower motor relay switched contact from the BJB. Ground to the relay coil is a dedicated circuit. When the blower motor relay coil receives power from the FCIM, the relay coil is energized and voltage is delivered to the blower motor speed control. Power and ground for the blower motor is provided by the blower motor speed control. The FCIM sends a PWM signal to the blower motor speed control to control the blower speed.
DTC Fault Trigger Conditions
DTC | Description | Fault Trigger Conditions |
|---|---|---|
B10AF:15 Blower Fan Relay: Circuit Short To Battery or Open | This DTC sets when the module senses greater than expected voltage on the blower relay coil voltage circuit, indicating an open circuit or a short to voltage. Blower relay is inactive when circuit is open; blower relay is on all the time when shorted to battery. | |
B10B9:14 | Blower Control: Circuit Short To Ground or Open | This DTC sets when the module senses no voltage on the blower motor control PWM circuit, indicating a short directly to ground or an open circuit. The blower motor runs at full speed if the circuit is shorted to ground. The blower motor is inoperative if the circuit is open. |
Possible Sources
Wiring, terminals or connectors Blower motor relay Blower motor speed control FCIM
2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.