Code Definition

B1428 — Lamp Seat Belt Circuit Failure

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

About B1428

B1428 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 B1428 is stored, the module has detected an electrical-circuit fault in the wiring, connector, or driver associated with the named component.

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.

B1428 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 Body Control Module (BCM) or Instrument Panel Cluster (IPC) controls the seat belt warning lamp using a low side driver that switches the lamp ground to illuminate the bulb or LED. DTC B1428 is a generic circuit failure code that the module sets when it detects a fault on the lamp output that does not match the specific open or short to battery or ground criteria. This often points at intermittent connectivity, partial bulb failure, or a fault that briefly meets multiple thresholds during diagnostic testing. When this code is active the seat belt warning lamp may illuminate erratically, fa...

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