Code Definition

B1049 — Driver Airbag Module Circuit Open

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

About B1049

B1049 is a manufacturer-specific body diagnostic trouble code recorded for Nissan vehicles. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B1049 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.

B1049 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 Nissan vehicles, the Supplemental Restraint System (SRS) control unit continuously monitors the driver airbag squib circuit (known as the DR1 circuit) to verify that the initiator resistance and continuity remain within specification. Fault code B1049 is stored when the SRS control unit detects an open circuit on the DR1 circuit (including the spiral cable or clock spring that carries the squib wiring through the steering column) while the ignition is on, battery voltage is within normal range, and the open condition persists beyond a calibrated timeout. Common triggers include a broken or ...

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