Code Definition

B1674 — Seat Driver Occupied Input Circuit Short To Battery

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

About B1674

B1674 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 B1674 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.

B1674 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 Restraints Control Module (RCM), or Supplemental Restraint System (SRS) module, monitors a driver seat occupancy input to determine whether the driver seat is occupied. DTC B1674 is set when the RCM detects that the driver seat occupied input circuit is shorted to battery voltage, meaning the input line is reading a voltage that is higher than the normal operating range of the sensor. The system uses this input alongside the seat belt switch to manage seat belt warning chimes, airbag deployment timing, and on some vehicles the passive restraint and pretensioner strategy. When this code is ...

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