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Home >> Toyota >> 2021 >> 4Runner TRD Pro >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Airbag System - Diagnostic Codes (B1690-B1905) & Symptom Tests >> Airbag System >> DTC B1905: Short in P/T Squib (LH) Circuit; DTC B1906: Open in P/T Squib (LH) Circuit; DTC B1907: Short in P/T Squib (LH) Circuit (to Ground); DTC B1908: Short in P/T Squib (LH) Circuit (to +B) [08/2019 - ] >> Description

DTC B1905: Short in P/T Squib (LH) Circuit; DTC B1906: Open in P/T Squib (LH) Circuit; DTC B1907: Short in P/T Squib (LH) Circuit (to Ground); DTC B1908: Short in P/T Squib (LH) Circuit (to +B) [08/2019 - ]: Description

The front pretensioner squib LH circuit consists of the airbag sensor assembly and front 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 front pretensioner squib LH circuit.

DTC Code DTC Detection Condition Trouble Area
B1905 One of the following conditions is met:
  • The airbag sensor assembly detects a line short circuit signal 5 times in the front pretensioner squib LH circuit during the primary check.
  • A front pretensioner squib LH malfunction.
  • An airbag sensor assembly malfunction.
  • No. 2 floor wire
  • Front seat outer belt assembly LH (Front pretensioner squib LH)
  • Airbag sensor assembly
B1906 One of the following conditions is met:
  • The airbag sensor assembly detects an open circuit signal in the front pretensioner squib LH circuit for 2 seconds.
  • A front pretensioner squib LH malfunction.
  • An airbag sensor assembly malfunction.
  • No. 2 floor wire
  • Front seat outer belt assembly LH (Front pretensioner squib LH)
  • Airbag sensor assembly
B1907 One of the following conditions is met:
  • The airbag sensor assembly detects a short circuit to ground signal in the front pretensioner squib LH circuit for 0.5 seconds.
  • A front pretensioner squib LH malfunction.
  • An airbag sensor assembly malfunction.
  • No. 2 floor wire
  • Front seat outer belt assembly LH (Front pretensioner squib LH)
  • Airbag sensor assembly
B1908 One of the following conditions is met:
  • The airbag sensor assembly detects a short circuit to B+ signal in the front pretensioner squib LH circuit for 0.5 seconds.
  • A front pretensioner squib LH malfunction.
  • An airbag sensor assembly malfunction.
  • No. 2 floor wire
  • Front seat outer belt assembly LH (Front pretensioner squib LH)
  • Airbag sensor assembly
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