Code Definition

B15C4 — SRS Communication Error

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

About B15C4

B15C4 is a manufacturer-specific body diagnostic trouble code recorded for Toyota vehicles. 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.

B15C4 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 audio and navigation receiver, gateway ECU, or combination meter (depending on the vehicle model) monitors CAN messages from the centre airbag sensor (SRS ECU). DTC B15C4 is stored when, with the ignition on, the monitoring module does not receive valid CAN frames from the SRS ECU for a calibrated timeout period, or detects a bus off, open circuit, or short circuit condition on the related CAN sub network. The SRS ECU broadcasts impact data, occupant classification status, and pretensioner deployment status across the bus so that other modules can react appropriately during a collision eve...

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