Lexus NX: System Description
SYSTEM DESCRIPTION
GENERAL
(a) In the occupant classification system, the occupant detection ECU calculates the weight of the occupant based on signals from the occupant classification sensors. This system recognizes the occupant as a child if it detects a weight of less than 17 kg (37.4 lb) on the front passenger seat, and then disables the instrument panel passenger airbag, front seat cushion airbag assembly RH.
(b) This system is mainly comprised of front and rear occupant classification sensors LH that detect the load on the front passenger seat. The occupant detection ECU controls the system, and the passenger airbag ON/OFF indicator indicates the ON/OFF condition of the instrument panel passenger airbag, front seat cushion airbag assembly RH.
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How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT:
Use the following procedure to troubleshoot the occupant classification system.
*: Use the Techstream.
PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP
NEX
Initialization
INITIALIZATION NOTICE: Make sure that the front passenger seat is not occupied before performing the operation. HINT: Perform zero point calibration and sensitivity check if any of the following cond
Problem Symptoms Table
PROBLEM SYMPTOMS TABLE HINT:
Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of
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Sleep Operation Failure of Occupant Classification ECU (B1796)
DESCRIPTION During sleep mode, the occupant detection ECU monitors the condition of each sensor while the power switch is off. In this mode, if the occupant detection ECU detects an internal malfunction, DTC B1796 is stored. DTC No. Detection Item DTC Detection Condition Trouble Area B1
Reassembly
REASSEMBLY CAUTION / NOTICE / HINT NOTICE:
Handle components indoors as much as possible to prevent foreign matter from entering and adhering to fog light assembly components.
Do not reuse parts which have reduced fastening ability due to thread damage.
When installing components, make sure t
