Pinpoint Test N : The Blower Motor Is Inoperative: Notes
WARNING: This page is about a different car, the 2018 Lincoln MKC. However, it is still accessible from the selected car via links, so may be relevant.
Refer to Automatic Climate Control System for schematic and connector information.
Normal Operation and Fault Conditions
Refer to Air Handling. Refer to: Climate Control System - System Operation and Component Description .
Voltage is supplied to the blower motor relay from the BJB. When the blower motor relay coil receives a ground from the BCM, the relay coil is energized and voltage is delivered to the blower motor speed control module. Voltage and ground for the blower motor is provided by the blower motor speed control. The HVAC control 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 |
|---|---|---|
| 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. Blower relay is permanently inactive. |
| B10AF:15 | Blower Fan Relay: Circuit Short To Battery or Open | This DTC sets when the module senses high voltage on the blower motor relay control circuit, indicating a short directly to voltage. Blower relay is permanently active. |
Possible Sources
- Fuses
- Wiring, terminals or connectors
- Blower motor relay
- Blower motor
- HVAC control module
- BCM
Visual Inspection and Diagnostic Pre-checks
- Verify BJB fuses 10 (40A) and 23 (5A) are OK.