Code Definition

B1426 — Lamp Seat Belt Circuit Short To Battery

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

About B1426

B1426 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 B1426 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.

B1426 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 while the bulb or LED receives switched battery voltage from the lighting supply. DTC B1426 sets when the module detects battery voltage on its lamp output even while the driver is commanded off, indicating the circuit has been shorted to a 12V source somewhere in the harness. Common locations include chafed wiring near body grommets, aftermarket accessory taps, and instrument panel connector damage. When this code is active the seat belt war...

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