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Home >> Lexus >> 2018 >> NX 300h >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Airbag System - Diagnostic Codes (3 Of 3) & Symptom Tests >> Airbag System >> DTC B1860-64: Short in Driver Side Knee Airbag Squib Circuit; DTC B1861-64: Open in Driver Side Knee Airbag Squib Circuit; DTC B1862-64: Short to GND in Driver Side Knee Airbag Squib Circuit; DTC B1863-64: Short to B+ in Driver Side Knee Airbag Squib Circuit [10/2014 - 05/2019] >> Description

DTC B1860-64: Short in Driver Side Knee Airbag Squib Circuit; DTC B1861-64: Open in Driver Side Knee Airbag Squib Circuit; DTC B1862-64: Short to GND in Driver Side Knee Airbag Squib Circuit; DTC B1863-64: Short to B+ in Driver Side Knee Airbag Squib Circuit [10/2014 - 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
B1860/64 Short in Driver Side Knee Airbag 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
B1861/64 Open in Driver Side Knee Airbag 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
B1862/64 Short to GND in Driver Side Knee Airbag Squib Circuit 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
B1863/64 Short to B+ in Driver Side Knee Airbag Squib Circuit 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