Code Definition

B2494 — ANTI THEFT HORN OUTPUT CIRCUIT Short to Batt

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

About B2494

B2494 is a generic (obd-ii standard) body diagnostic trouble code. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B2494 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 B2494 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

The Body Control Module (BCM) or anti theft control module drives the anti theft horn output, which sounds the security horn or siren when the alarm is triggered. DTC B2494 is set when the module detects battery voltage on the anti theft horn output wire at a time when it should not be present, indicating a short to battery somewhere in the horn output wiring, the horn assembly, or an aftermarket alarm installation. The module monitors the actual voltage on the output line and compares it against the commanded state, and protects its internal driver from damage when an unexpected source of vol...

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