Code Definition

B1771 — Seat Driver Backward Circuit Short To Battery

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

About B1771

B1771 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 B1771 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) 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.

B1771 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 Seat Module (DSM), or Body Control Module on simpler systems, drives the driver seat backward output through a smart driver or H bridge to the horizontal slide motor. DTC B1771 is set when the module detects unexpected battery voltage on this output line, meaning the wire is being held high by an external power source even when the module commands the output off or active in the opposite polarity. The module sees this as a short to power and stores the code to protect the driver stage from damage. When this code is active, the driver seat may slide rearward continuously without comm...

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