Code Definition

B1539 — Mirror Driver Switch Assembly Circuit Failure

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

About B1539

B1539 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 B1539 is stored, the module has detected an electrical-circuit fault in the wiring, connector, or driver associated with the named component.

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.

B1539 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

This code relates to the Mirror Driver Switch Assembly circuit, which is the electric mirror control switch mounted in the driver door trim panel. The switch contains internal contacts that select either the left or right side mirror and supply 12V power and ground signals to the mirror motor windings based on the directional input from the driver. The Body Control Module (BCM), or in some applications the Driver Door Module, monitors the switch input states and the integrity of the mirror motor feed circuits, and sets B1539 when a general circuit failure is detected in the switch assembly or ...

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