Code Definition

B0103 (12) — Driver first step airbag squib Circuit shorted to power

System: Body  |  Type: Generic (OBD-II Standard)  |  Make: Toyota

About B0103

B0103 is a generic (obd-ii standard) body diagnostic trouble code recorded for Toyota vehicles. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B0103 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.

Because B0103 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

DTC B0103:12 is a Toyota body code indicating that the airbag control module (ACM) has detected a short to voltage in the driver first stage airbag squib circuit. The squib is the electrically fired igniter in the steering wheel airbag, and the ACM monitors its firing loop for correct resistance and for any unintended connection to a power source. This code sets when part of the squib circuit picks up voltage from another circuit, commonly through a chafed harness, a damaged clock spring, or a wiring fault introduced during accessory fitment, which can interfere with correct deployment control...

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