Code Definition

B3949 — Right Front Turn Signal Circuit Short to Battery

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

About B3949

B3949 is a manufacturer-specific body diagnostic trouble code recorded for Holden vehicles. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B3949 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.

B3949 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

On Holden vehicles, the Body Control Module (BCM) controls and monitors the right front turn signal lamp control circuit to ensure correct voltage response when the indicator is commanded ON and OFF. DTC B3949 is set when the BCM detects battery voltage on the right front turn signal control circuit when the output is commanded OFF, or a higher-than-expected voltage for a calibrated period. This indicates a short to battery voltage on the control circuit, which can cause the indicator to remain illuminated continuously or operate incorrectly.

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