Code Definition

B1973 — Passenger Rear Seat Down Switch Circuit Short to Battery

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

About B1973

B1973 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 B1973 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.

B1973 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 rear seat down switch (the switch that lowers the rear of the seat cushion in the seat tilt function) 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 rear cushion tilt down motion. DTC B1973 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...

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