Code Definition

B10AF — Blower Fan Relay: Circuit Short To Battery or Open

System: Body  |  Type: Manufacturer-Specific  |  Make: Ford

About B10AF

B10AF is a manufacturer-specific body diagnostic trouble code recorded for Ford vehicles. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B10AF is stored, the module has detected an open (broken or disconnected) electrical path in the monitored circuit; a short-circuit (voltage pulled to ground or to supply) in the monitored circuit; and a signal or supply voltage lower than the expected operating range.

Scanning & clearing: Body (B) codes are often stored in the body control module, airbag module, or climate module. A basic OBD-II tool usually will not read body codes — an enhanced or OEM-level scan tool is typically required.

B10AF is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The HVAC Control Module energises the coil of the blower fan relay to route high current battery voltage through the relay contacts to the blower motor or to the blower motor power module. DTC B10AF is logged when the module detects either an open circuit or a voltage level matching battery potential on its output to the blower relay coil, indicating that control of the relay has been lost. An open circuit means the coil cannot be energised and the blower fan fails to start regardless of fan speed request. A short to battery voltage can cause the relay to remain energised continuously so the b...

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