Code Definition

B0136 (74) — LHF seat belt pretensioner squib Circuit open

System: Body  |  Type: Generic (OBD-II Standard)  |  Make: Toyota

About B0136

B0136 is a generic (obd-ii standard) 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.

When B0136 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.

Because B0136 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The airbag control module, called the Center Airbag Sensor Assembly or SRS ECU on Toyota, continuously monitors the left hand front seat belt pretensioner squib circuit and expects to see the low resistance, typically around 2 ohms, of the squib bridge wire. DTC B0136 sub code 74 sets when the module measures an open circuit or excessively high resistance in that firing loop, meaning the current path needed to fire the pretensioner is broken. The pretensioner is a pyrotechnic device in the seat belt buckle or retractor that fires to pull slack out of the belt during a collision, and its squib ...

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