Code Definition

B104B — RHF Side Airbag Impact Sensor Incorrect Assembly Installed

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

About B104B

B104B is a manufacturer-specific body diagnostic trouble code recorded for Mazda vehicles. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B104B is stored, the module has detected 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.

B104B 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 Mazda vehicles fitted with side impact supplemental restraints, the Restraint Control Module (RCM) monitors the identification and communication of every satellite impact sensor on the side airbag system. Fault code B104B is stored when the RCM detects that the right hand front (RHF) side airbag impact sensor (typically a digital accelerometer mounted in the B pillar or front door) reports an incorrect part identification, an out of range resistance, or a digital signature that does not match the configuration stored in the module. The most common trigger is installation of an incorrect aft...

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