LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2021 >> NX 300 Base, AWD >> Repair and Diagnosis (Single Page) >> Restraints >> Air Bag, SRS >> Occupant Classification System - Diagnostic Codes & Symptom Tests >> Occupant Classification System >> DTC B1780: Front Occupant Classification Sensor LH Circuit Malfunction [10/2014 - ] >> Description
April 5, 2026: LEMON Manuals is launched! Read the announcement.

DTC B1780: Front Occupant Classification Sensor LH Circuit Malfunction [10/2014 - ]: Description

The front occupant classification sensor LH circuit consists of the occupant detection ECU and front occupant classification sensor LH.

DTC B1780 is stored when a malfunction is detected in the front occupant classification sensor LH circuit.

DTC No. Detection Item DTC Detection Condition Trouble Area
B1780 Front Occupant Classification Sensor LH Circuit Malfunction One of the following conditions is met: 
  • Occupant detection ECU detects a line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to +B signal in the front occupant classification sensor LH circuit for 2 seconds.
  • Front occupant classification sensor LH malfunction.
  • Occupant detection ECU malfunction.
  • Front seat adjuster assembly RH (front occupant classification sensor LH)
  • Front seat wire RH
  • Occupant detection ECU

HINT: