Pinpoint Test W : The Blower Motor Is Inoperative - EMTC: Notes
WARNING: This page is about a different car, the 2017 Lincoln Navigator and 2017 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.
Refer to Manual Climate Control System , for schematic and connector information.
Normal Operation and Fault Conditions
Voltage is supplied to the relay coil and relay switch contacts from BJB. The coil receives ground from the HVAC control module if any function selector position but OFF is selected. When the relay coil is grounded by the HVAC control module, the relay is energized and voltage is delivered to the blower motor. Ground for the blower motor is provided from the blower resistor or the blower switch (in HI only). The blower resistor and blower switch are grounded.
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B10AF:12 | Blower Fan Relay: Circuit Short to Battery | This DTC sets when the HVAC control module senses voltage on the relay coil ground circuit when the relay is grounded by the HVAC control module, indicating a short directly to voltage. |
| B10AF:13 | Blower Fan Relay: Circuit Open | This CMDTC sets when the HVAC control module senses no voltage on the relay coil ground circuit when the relay is not grounded by the HVAC control module, indicating an open. |
Possible Sources
- Wiring, terminals or connectors
- Blower motor
- Blower motor relay
- HVAC control module
Visual Inspection and Diagnostic Pre-checks
- Inspect Battery Junction Box (BJB) fuses 32 (40A) and 57 (5A)