Code Definition

B2404 — Audio Steering Wheel Switch Circuit Fault

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

About B2404

B2404 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 B2404 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.

Because B2404 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), Audio Control Module, or Steering Column Control Module monitors the steering wheel mounted audio control switch resistor network through a single multiplexed analog signal input. DTC B2404 is set when the monitored voltage at the audio switch input falls outside the expected range for any defined switch position, indicating a circuit fault such as an open, short, or out of range resistance value. Most steering wheel audio switches use a resistor ladder where each button press produces a unique voltage at the input, and corrosion or contact wear inside the switch...

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