Code Definition

B1657 — Seat Driver Rear Up Circuit Short To Battery

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

About B1657

B1657 is a manufacturer-specific body diagnostic trouble code. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B1657 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.

B1657 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

B1657 indicates that the seat control module has detected a short to battery condition on the driver seat rear up motor circuit. This circuit drives the rear lift motor that raises the rear of the driver seat cushion, and the module sets this code when it sees battery voltage on the circuit at a time when the output should be off, or when the current draw on the up command exceeds the safe threshold for the driver. A short to battery is typically caused by a damaged conductor that has come into contact with a positive supply wire, water bridging between pins inside a connector, or an internal ...

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