Code Definition

B1648 — Seat Driver Recline Forward Circuit Open

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

About B1648

B1648 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 B1648 is stored, the module has detected an open (broken or disconnected) electrical path in the monitored circuit.

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.

B1648 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 B1648 fault code indicates an open circuit condition has been detected by the Driver Seat Module (DSM) or Body Control Module (BCM) in the driver seat recline forward control circuit. 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 an output to the recline motor and uses voltage feedback or load monitoring to verify the circuit is electrically intact. When the module commands the output and sees no current flow, or sees an output voltage profile consistent with a bro...

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