B1923 - FAULT CODE - OBD2

POST UPDATED IN February, 2023

B1923 Code failures by brands

B1923 TOYOTA, LEXUS, SCION: POSITIVE SHORT IN REAR PRETENSIONER RH CIRCUIT

Description of DTC code B1923

The right rear pretensioner trigger circuit is comprised of the center airbag sensor assembly and the right rear seat outboard belt assembly. This circuit is intended to indicate when to activate the Supplemental Restraint System (SRS) once the deployment conditions are met.

B1923 OBD2 diagnostic code is stored when the right rear pretensioner trigger circuit experiences a short to positive voltage fault.

Symptoms of fault code B1923

  • Check Engine lamp illuminates.
  • The airbag warning light illuminated.

Causes of OBD2 B1923

B1923 OBDII fault code is set by the following:

  • Rear seat outboard belt assembly circuit wiring or connectors may be in poor condition.
  • Rear seat outboard belt assembly circuit electrical connections may be faulty resulting in a short.
  • Right Rear (RH) Seat Outboard Belt Assembly (Right Rear Pretensioner Squib) may be defective.
  • The center airbag sensor assembly may be defective.

Possible solutions of the DTC code B1923

In order to fix DTC B1923 OBD2 you must do the following:

  • As a first step consult the TSB (Technical Service Bulletins).
  • Inspect and check the good condition of the cables and connectors related to the circuit of the rear seat outer belt assembly. If you detect deficiencies due to corrosion or burns, make the corresponding adjustments.
  • Using the appropriate tools, perform electrical checks on the rear seat outboard belt assembly circuit. Measure the voltages of this circuit and verify if they are within the parameters indicated by the manufacturer. If you find deficient voltages that indicate the short to positive, check that it is not due to connections in bad conditions. Repair as applicable.
  • Following the manufacturer's diagnostic steps, check the condition of the right rear (RH) outboard seat belt assembly (right rear pretensioner squib). If you determine that it is damaged, make the appropriate corrections.

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