Code Definition

B2209 — Interior Lamp Override Switch Open Circuit

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

About B2209

B2209 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 B2209 is stored, the module has detected an open (broken or disconnected) electrical path 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 B2209 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 B2209 fault code indicates that the body control module (BCM) has detected an open circuit on the interior lamp override switch input. The interior lamp override switch is a manually operated switch, typically located on the instrument panel or overhead console, that allows the driver to disable interior dome lamp illumination when doors are opened. The BCM monitors the switch by applying a reference voltage to the signal circuit and reading whether the switch pulls that circuit to ground when activated. The code is set when the BCM sees reference voltage with no expected pull to ground ov...

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