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Home >> Lexus >> 2021 >> NX 300h Luxury >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Airbag System - Diagnostic Codes (3 Of 3) & Symptom Tests >> Airbag System >> DTC B1860: Short in Knee Airbag (D Side) Squib Circuit; DTC B1861: Open in Knee Airbag (D Side) Squib Circuit; DTC B1862: Short in Knee Airbag (D Side) Squib Circuit (to Ground); DTC B1863: Short in Knee Airbag (D Side) Squib Circuit (to +B) [05/2019 - ] >> Description

DTC B1860: Short in Knee Airbag (D Side) Squib Circuit; DTC B1861: Open in Knee Airbag (D Side) Squib Circuit; DTC B1862: Short in Knee Airbag (D Side) Squib Circuit (to Ground); DTC B1863: Short in Knee Airbag (D Side) Squib Circuit (to +B) [05/2019 - ]: Description

The driver side knee squib circuit consists of the airbag ECU assembly and lower No. 1 instrument panel airbag assembly.

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

These DTCs are stored when a malfunction is detected in the driver side knee squib circuit.

DTC No. Detection Item DTC Detection Condition Trouble Area
B1860 Short in Knee Airbag (D Side) Squib Circuit One of the following conditions is met:
  • The airbag ECU assembly detects a line short circuit signal 5 times in the driver side knee squib circuit during the primary check.
  • A lower No. 1 instrument panel airbag assembly malfunction.
  • An airbag ECU assembly malfunction.
  • Instrument panel wire
  • Lower No. 1 instrument panel airbag assembly
  • Airbag ECU assembly
B1861 Open in Knee Airbag (D Side) Squib Circuit One of the following conditions is met:
  • The airbag ECU assembly detects an open circuit signal in the driver side knee squib circuit for 2 seconds.
  • A lower No. 1 instrument panel airbag assembly malfunction.
  • An airbag ECU assembly malfunction.
  • Instrument panel wire
  • Lower No. 1 instrument panel airbag assembly
  • Airbag ECU assembly
B1862 Short in Knee Airbag (D Side) Squib Circuit (to Ground) One of the following conditions is met:
  • The airbag ECU assembly detects a short circuit to ground signal in the driver side knee squib circuit for 0.5 seconds.
  • A lower No. 1 instrument panel airbag assembly malfunction.
  • An airbag ECU assembly malfunction.
  • Instrument panel wire
  • Lower No. 1 instrument panel airbag assembly
  • Airbag ECU assembly
B1863 Short in Knee Airbag (D Side) Squib Circuit (to +B) One of the following conditions is met:
  • The airbag ECU assembly detects a short circuit to B+ signal in the driver side knee squib circuit for 0.5 seconds.
  • A lower No. 1 instrument panel airbag assembly malfunction.
  • An airbag ECU assembly malfunction.
  • Instrument panel wire
  • Lower No. 1 instrument panel airbag assembly
  • Airbag ECU assembly
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