Code Definition

B1971 — Passenger Seatback Rearward Switch Circuit Short to Ground

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

About B1971

B1971 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 B1971 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.

B1971 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 passenger seat module monitors the seatback rearward (recline) switch as part of the power seat control system. The switch is a momentary contact that pulls the input line either to ground or to a voltage reference when pressed, telling the module the occupant wants the backrest to tilt rearward. DTC B1971 sets when the module detects that the switch input line is held at ground continuously, indicating either a stuck switch contact or a short to ground somewhere along the signal wire. When this code is active the seat module typically locks out the seatback adjustment in that direction to...

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