Code Definition

B1647 — Seat Driver Recline Forward Circuit Failure

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

About B1647

B1647 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 B1647 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.

B1647 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 B1647 fault code indicates a circuit failure in the driver seat recline forward control circuit, monitored by the Driver Seat Module (DSM) or Body Control Module (BCM) on equipped vehicles. This circuit drives the electric motor that tilts the seat backrest forward when the driver operates the recline switch on power adjustable seats. The seat module energises a high-side or low-side output to the recline forward motor and monitors the load current and voltage feedback, setting B1647 when it detects an out-of-range condition such as an open circuit, short to power, short to ground, or exce...

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