Code Definition

B1929 — Airbag Safing Sensor Output Circuit Open

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

About B1929

B1929 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 B1929 is stored, the module has detected an open (broken or disconnected) electrical path in the monitored circuit; and a sensor-related fault — the reported value from the named sensor is out of spec.

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.

B1929 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 airbag safing sensor is a secondary acceleration sensor that the Restraint Control Module (RCM) uses as a safety interlock, requiring both the main impact sensors and the safing sensor to confirm a genuine crash event before any airbag will deploy. DTC B1929 is set specifically when the RCM detects an open circuit condition on the safing sensor output, meaning the signal return has lost continuity back to the module. On platforms with a discrete safing sensor this typically points to a broken wire, disconnected connector, or a failed sensor, while on platforms with an internal safing senso...

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