The Blower Motor Is Inoperative
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:11 | Blower Fan Relay: Circuit Short To Ground | This DTC sets when the module senses low voltage on the relay coil voltage circuit when the module is energizing the circuit. The blower motor relay is permanently inactive. |
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. The blower motor relay is inactive when circuit is open; the blower motor relay is on all the time when shorted to battery. | |
B10B9:12 | Blower Control: Circuit Short To Battery | This DTC sets when the module senses high voltage on the blower motor control PWM circuit, indicating a short directly to voltage. The blower motor is inoperative. |
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 Fuse Blower motor relay Blower motor Blower motor speed control FCIM
Visual Inspection and Diagnostic Pre-checks
Inspect BJB fuse 10 (40A).
PINPOINT TEST J : THE BLOWER MOTOR IS INOPERATIVE
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
J1 CHECK THE BLOWER MOTOR RELAY
Ignition OFF. Disconnect Blower motor relay. Carry out the component test on the blower motor relay. Refer to Wiring Diagrams Cell 149 for schematic and connector information.
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.