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Home >> Lexus >> 2019 >> LC 500 >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Airbag System - Diagnostic Codes (Coupe) (5 Of 5) & Symptom Tests >> Airbag System >> DTC B1920: Short in Rear P/T Squib (RH) Circuit; DTC B1921: Open in Rear P/T Squib (RH) Circuit; DTC B1922: Short in Rear P/T Squib (RH) Circuit (to Ground); DTC B1923: Short in Rear P/T Squib (RH) Circuit (to +B) [04/2020 - 05/2023] >> Description

DTC B1920: Short in Rear P/T Squib (RH) Circuit; DTC B1921: Open in Rear P/T Squib (RH) Circuit; DTC B1922: Short in Rear P/T Squib (RH) Circuit (to Ground); DTC B1923: Short in Rear P/T Squib (RH) Circuit (to +B) [04/2020 - 05/2023]: Description

The rear seat belt pretensioner RH circuit consists of the airbag ECU assembly and rear No. 1 seat outer belt assembly RH.

This circuit instructs the SRS to deploy when deployment conditions are met.

These DTCs are stored when a malfunction is detected in the rear seat belt pretensioner RH circuit.

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Test Mode / Check Mode
B1920 Short in Rear P/T Squib (RH) Circuit One of the following conditions is met:
  • The airbag ECU assembly detects a line short circuit signal 5 times in the rear seat belt pretensioner RH circuit during the primary check.
  • A rear No. 1 seat outer belt assembly RH malfunction.
  • An airbag ECU assembly malfunction.
  • Floor wire
  • Rear No. 1 seat outer belt assembly RH
  • Airbag ECU assembly
Comes on Applicable
B1921 Open in Rear P/T Squib (RH) Circuit One of the following conditions is met:
  • The airbag ECU assembly detects an open circuit signal in the rear seat belt pretensioner RH circuit for 2 seconds.
  • A rear No. 1 seat outer belt assembly RH malfunction.
  • An airbag ECU assembly malfunction.
  • Floor wire
  • Rear No. 1 seat outer belt assembly RH
  • Airbag ECU assembly
Comes on Applicable
B1922 Short in Rear P/T Squib (RH) Circuit (to Ground) One of the following conditions is met:
  • The airbag ECU assembly detects a short circuit to ground signal in the rear seat belt pretensioner RH circuit for 0.5 seconds.
  • A rear No. 1 seat outer belt assembly RH malfunction.
  • An airbag ECU assembly malfunction.
  • Floor wire
  • Rear No. 1 seat outer belt assembly RH
  • Airbag ECU assembly
Comes on Applicable
B1923 Short in Rear P/T Squib (RH) Circuit (to +B) One of the following conditions is met:
  • The airbag ECU assembly detects a short circuit to B+ signal in the rear seat belt pretensioner RH circuit for 0.5 seconds.
  • A rear No. 1 seat outer belt assembly RH malfunction.
  • An airbag ECU assembly malfunction.
  • Floor wire
  • Rear No. 1 seat outer belt assembly RH
  • Airbag ECU assembly
Comes on Applicable