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Home >> Lexus >> 2023 >> LS 500h >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Airbag System (W/O Advanced Park) - Diagnostic Codes (3 Of 3) >> AIRBAG SYSTEM (w/o Advanced Park) >> DTC B1925: Short in Rear P/T Squib LH Circuit; DTC B1926: Open in Rear P/T Squib LH Circuit; DTC B1927: Short in Rear P/T Squib LH Circuit (To Ground); DTC B1928: Short in Rear P/T Squib LH Circuit (To B+) [10/2020 - 10/2023] >> Description

DTC B1925: Short in Rear P/T Squib LH Circuit; DTC B1926: Open in Rear P/T Squib LH Circuit; DTC B1927: Short in Rear P/T Squib LH Circuit (To Ground); DTC B1928: Short in Rear P/T Squib LH Circuit (To B+) [10/2020 - 10/2023]: Description

The rear seat belt pretensioner LH circuit consists of the airbag ECU assembly and rear seat outer belt assembly LH.

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 LH circuit.

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Test Mode / Check Mode
B1925 Short in Rear P/T Squib LH 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 LH circuit during the primary check.
  • A rear seat outer belt assembly LH malfunction.
  • An airbag ECU assembly malfunction.
  • Floor wire
  • Rear seat outer belt assembly LH
  • Airbag ECU assembly
Comes on Applicable
B1926 Open in Rear P/T Squib LH Circuit One of the following conditions is met:
  • The airbag ECU assembly detects an open circuit signal in the rear seat belt pretensioner LH circuit for 2 seconds.
  • A rear seat outer belt assembly LH malfunction.
  • An airbag ECU assembly malfunction.
  • Floor wire
  • Rear seat outer belt assembly LH
  • Airbag ECU assembly
Comes on Applicable
B1927 Short in Rear P/T Squib LH 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 LH circuit for 0.5 seconds.
  • A rear seat outer belt assembly LH malfunction.
  • An airbag ECU assembly malfunction.
  • Floor wire
  • Rear seat outer belt assembly LH
  • Airbag ECU assembly
Comes on Applicable
B1928 Short in Rear P/T Squib LH 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 LH circuit for 0.5 seconds.
  • A rear seat outer belt assembly LH.
  • An airbag ECU assembly malfunction.
  • Floor wire
  • Rear seat outer belt assembly LH
  • Airbag ECU assembly
Comes on Applicable