Lexus NX: System Description
SYSTEM DESCRIPTION
GENERAL
(a) Deceleration sensors used for the airbag system are installed on various parts of the vehicle and calculate the deceleration rate of each part during a collision.
(b) Depending on the situation, the airbag ECU assembly sends a deployment signal to each airbag based on the information from each sensor.
DEPLOYMENT CONDITION
(a) FRONTAL COLLISION
(1) Frontal collision signals are produced based on the information from the airbag ECU assembly and front airbag sensors.
HINT:
In case of a frontal collision, the SRS ignition signal could be output with the deceleration sensor ON signal even without a signal from the front airbag sensors.
(2) Frontal collision signals are used to deploy the airbags and pretensioners in the illustration.
(b) SIDE COLLISION (1)
(1) Side collision (Pattern 1) signals are produced based on the information from the airbag ECU assembly and door side airbag sensor.
(2) Side collision (Pattern 1) signals are used to deploy the airbags and pretensioners in the illustration.
(c) SIDE COLLISION (2)
(1) Side collision (Pattern 2) signals are produced based on the information from the airbag ECU assembly and side airbag sensor assembly.
(2) Side collision (Pattern 2) signals are used to deploy the airbags and pretensioners in the illustration.
(d) ROLLOVER
(1) A circuit to detect vehicle rollover is built into the airbag ECU assembly.
(2) When the conditions for vehicle rollover are met, the airbag ECU assembly deploys the SRS items in the illustration.
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How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT:
Use these procedures to troubleshoot the airbag system.
*: Use the Techstream.
PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP
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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 pr
Terminals Of Ecu
TERMINALS OF ECU AIRBAG ECU ASSEMBLY Terminal No. Terminal Symbol Destination I58-1 P2+ Instrument panel passenger airbag assembly (Front passenger side squib 2nd step) I58-2 P2-
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Data List / Active Test
DATA LIST / ACTIVE TEST DATA LIST HINT: Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may be dis
Components
COMPONENTS ILLUSTRATION *1 FRONT SUSPENSION MEMBER REINFORCEMENT RH *2 NO. 1 ENGINE UNDER COVER ASSEMBLY N*m (kgf*cm, ft.*lbf): Specified torque - - ILLUSTRATION *1 CRANKSHAFT PULLEY ASSEMBLY *2 TIMING CHAIN COVER OIL SEAL *3 CRANKSHAFT PULLEY SET BOLT - -
