Code Definition

B1900 — Driver Side Airbag Fault

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

About B1900

B1900 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.

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.

B1900 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 Restraints Control Module (RCM, also called the Airbag Control Module or SRS module) continuously monitors each airbag squib circuit by passing a small known current through the deployment loop and measuring the loop resistance and integrity. DTC B1900 is set when the RCM detects a fault on the driver side airbag deployment loop, which may be an open, short to ground, short to power, or out of range resistance on the driver airbag squib circuit. The driver airbag is mounted in the steering wheel and is connected to the RCM through the clockspring, with shorting bars in the connectors keepi...

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