Code Definition

B1499 — Lamp Turn Signal Left Circuit Failure

System: Body  |  Type: Manufacturer-Specific  |  Make: Generic

About B1499

B1499 is a manufacturer-specific body diagnostic trouble code. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B1499 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.

B1499 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The Body Control Module (BCM) or lighting control module monitors the left turn signal lamp circuit for proper electrical operation by measuring current draw and circuit feedback during signal activation. DTC B1499 sets when the module detects an electrical fault in this circuit, typically an open, short to ground, short to power, or abnormal resistance that prevents normal lamp operation. Modern lighting circuits use either a current sensing approach for incandescent bulbs or a load monitoring strategy for LED assemblies, allowing the module to distinguish between normal operation and a fault...

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