Lexus NX manuals

Lexus NX: System Diagram

Lexus NX Service Manual / Steering / Steering Column / Steering Lock System / System Diagram

SYSTEM DIAGRAM

Circuit Description

Component

Outline

Steering Lock ECU (Steering Lock Actuator Assembly)
  • The steering is locked and unlocked by communicating with the certification ECU (smart key ECU assembly) and ID code box (immobiliser code ECU) via LIN communication.
  • When the following conditions are met, the steering can be unlocked.
    • The codes (L codes) of the ID code box (immobiliser code ECU) and steering lock match.
    • The codes (S codes) of the ID code box (immobiliser code ECU) and certification ECU (smart key ECU assembly) match.
    • The certification ECU (smart key ECU assembly) and key ID codes match.

Certification ECU (Smart Key ECU Assembly)
  • The ID code of the key the user is carrying is sent to the electrical key antenna.
  • The certification ECU (smart key ECU assembly) compares the key ID code it receives from the electrical key antenna with its own ID code. If they match, the certification ECU (smart key ECU assembly) permits the steering lock ECU (steering lock actuator assembly) to turn the power on, start the hybrid control system and unlock and lock the steering.
  • Outputs a command to supply power to the steering lock motor based on the power source mode, shift position and vehicle speed signal.

ID Code Box (Immobiliser Code ECU)

Receives immobiliser set and unset commands from the certification ECU (smart key ECU assembly) via LIN communication and sends them to the hybrid vehicle control ECU.

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 System Description

SYSTEM DESCRIPTION UNLOCK OPERATION CONDITIONS FOR STEERING LOCK (a) When the following condition is met, the unlock operation is performed. The power switch is on (ACC) or on (IG). HINT: When t

 How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT HINT: Use the following procedures to troubleshoot the steering lock system. *: Use the Techstream. PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP NEXT

 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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 Hydraulic Control System Malfunction (C1214)

DESCRIPTION The skid control ECU (brake booster with master cylinder assembly) controls braking force according to the hybrid control system regenerative braking force and provides the hydraulic pressure necessary for operating each wheel cylinder according to the wheel cylinder pressure sensor. DTC

 Inspection

INSPECTION PROCEDURE 1. INSPECT AIR CONDITIONING CONTROL ASSEMBLY (SEAT BELT WARNING LIGHT) (for Rear Side) (a) Check the seat belt warning light illumination. OK: Measurement Condition Specified Condition Battery positive (+) → Terminal 8 (IG+) Battery negative (-) → 1 (RRID) RH

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