Code Definition

B2499 — COURTESY LAMP OUTPUT Failure

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

About B2499

B2499 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.

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 B2499 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) drives the interior courtesy lamp circuit, switching the dome lamp, map lamps, or footwell lamps on when a door is opened, the unlock command is issued, or the interior lamp switch is pressed. DTC B2499 is set when the BCM detects that the courtesy lamp output circuit is not functioning to specification, generally indicating an open circuit, blown bulb, or absent load when the output is commanded on. The BCM monitors the feedback voltage or current draw on this output, and when the measured value falls outside the expected range during an activation event the code...

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