PINPOINT TEST Q : Pinpoint Test Q: THE BLOWER MOTOR IS INOPERATIVE: Notes
Diagnostic Overview
Diagnostics in this article assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to Diagnostic Methods in Service Information for information about these practices.
Refer to Automatic Climate Control System , for schematic and connector information.
Normal Operation and Fault Conditions
Ground is provided for the blower motor speed control. Voltage is provided to the blower motor relay coil and switch contacts. When the blower motor relay coil receives a ground from the HVAC module, the relay coil is energized and voltage is delivered from the blower motor relay to the blower motor. A varying ground for the blower motor is provided from the blower motor speed control. The HVAC module provides a blower target speed signal to the blower motor speed control to control the blower speed. The actual blower speed signal is provided to the HVAC module from the blower motor speed control.
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B10AF:12 | Blower Fan Relay: Circuit Short to Battery | This CMDTC sets when the HVAC module senses voltage on the relay coil ground circuit when the relay is grounded by the HVAC module, indicating a short directly to voltage. |
| B10AF:13 | Blower Fan Relay: Circuit Open | This CMDTC sets when the HVAC module senses no voltage on the relay coil ground circuit when the relay is not grounded by the HVAC module, indicating an open. |
| B10B9:14 | Blower Control: Circuit Short to Ground or Open | This CMDTC sets when the HVAC module senses no voltage on the blower motor control target speed signal circuit, indicating an open or a short directly to ground. |
Possible Sources
- Fuse(s)
- Wiring, terminals or connectors
- Blower motor relay
- Blower motor speed control
- Blower motor
- HVAC module
- FCIM
Visual Inspection and Diagnostic Pre-checks
- Inspect loose or corroded blower motor relay connections.