Code Definition

B1721 — Seat Driver Rearward Switch Circuit Failure

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

About B1721

B1721 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 B1721 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.

B1721 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 Body Control Module (BCM) or Driver Seat Module (DSM) monitors the driver seat rearward switch input circuit and sets code B1721 when an electrical fault is detected on the switch signal line. The seat rearward switch is a normally open momentary contact device mounted on the seat side trim that signals the seat module to drive the horizontal adjustment motor rearward when pressed. Code B1721 is a general circuit failure flag set when the module sees an invalid signal pattern that does not match an open, short to battery, or short to ground condition specifically. When this code is active ...

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