Code Definition

B1543 — Seat Direction Switch Assembly Circuit Failure

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

About B1543

B1543 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 B1543 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.

B1543 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 Driver Door Module (DDM), seat module, or Body Control Module (BCM) monitors the seat direction switch assembly used to control power seat movements such as forward, rearward, up, and down. DTC B1543 is set when the module detects an electrical circuit failure within the seat direction switch assembly, indicating the switch signals are outside the expected operating range or that an invalid combination of switch inputs has been received. The seat direction switch is a multi-pole momentary contact assembly that grounds different signal lines to the module depending on which direction is sel...

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