Code Definition

B1979 — Passenger Seat Rearward Switch Circuit Short to Battery

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

About B1979

B1979 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 B1979 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.

B1979 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 seat rearward switch (the switch that slides the entire seat assembly backward along the rails) as part of the power seat control system. The switch is a momentary contact that selectively grounds or shorts to voltage on the input line when pressed to command rearward slide motion. DTC B1979 sets when the module detects the switch input line is held at battery voltage continuously, indicating either a stuck switch contact, a short to a voltage source somewhere along the signal wire, or a damaged switch pack bridging the input to a power feed. When this co...

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