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Home >> Lexus >> 2021 >> GX 460 Luxury >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Supplemental Restraint System (Diagnostic Codes) (3 Of 3) & Symptom Tests >> Airbag System >> DTC B1925-78: Short in Rear Pretensioner Squib LH Circuit; DTC B1926-78: Open in Rear Pretensioner Squib LH Circuit; DTC B1927-78: Short to GND in Rear Pretensioner Squib LH Circuit; DTC B1928-78: Short to B+ in Rear Pretensioner Squib LH Circuit [08/2015 - 08/2019] >> Description

DTC B1925-78: Short in Rear Pretensioner Squib LH Circuit; DTC B1926-78: Open in Rear Pretensioner Squib LH Circuit; DTC B1927-78: Short to GND in Rear Pretensioner Squib LH Circuit; DTC B1928-78: Short to B+ in Rear Pretensioner Squib LH Circuit [08/2015 - 08/2019]: Description

The rear pretensioner squib LH circuit consists of the center airbag sensor and the rear No. 1 seat outer belt 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 pretensioner squib LH circuit.

DTC Code DTC Detection Condition Trouble Area
B1925/78 One of the following conditions is met:
  • The center airbag sensor detects a line short circuit signal 5 times in the rear pretensioner squib LH circuit during the primary check.
  • A rear pretensioner squib LH malfunction.
  • A center airbag sensor malfunction.
  • No. 2 floor wire
  • Rear No. 1 seat outer belt assembly LH (Rear pretensioner squib LH)
  • Center airbag sensor assembly
B1926/78 One of the following conditions is met:
  • The center airbag sensor detects an open circuit signal in the rear pretensioner squib LH circuit for 2 seconds.
  • A rear pretensioner squib LH malfunction.
  • A center airbag sensor malfunction.
  • No. 2 floor wire
  • Rear No. 1 seat outer belt assembly LH (Rear pretensioner squib LH)
  • Center airbag sensor assembly
B1927/78 One of the following conditions is met:
  • The center airbag sensor detects a short circuit to ground signal in the rear pretensioner squib LH circuit for 0.5 seconds.
  • A rear pretensioner squib LH malfunction.
  • A center airbag sensor malfunction.
  • No. 2 floor wire
  • Rear No. 1 seat outer belt assembly LH (Rear pretensioner squib LH)
  • Center airbag sensor assembly
B1928/78 One of the following conditions is met:
  • The center airbag sensor detects a short circuit to B+ signal in the rear pretensioner squib LH circuit for 0.5 seconds.
  • A rear pretensioner squib LH malfunction.
  • A center airbag sensor malfunction.
  • No. 2 floor wire
  • Rear No. 1 seat outer belt assembly LH (rear pretensioner squib LH)
  • Center airbag sensor assembly
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