Lexus NX: System Description
SYSTEM DESCRIPTION
AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL
(a) General
The automatic headlight beam level control system ensures forward visibility and prevents dazzling of drivers in oncoming and preceding vehicles by controlling the headlight beam level vertically when the weight of passengers and loads has caused the vehicle attitude to change.
NOTICE:
- A new headlight ECU sub-assembly LH cannot operate until it is initialized.
- Even if the headlight ECU sub-assembly RH is replaced with a new one, initialization is not necessary.
- Initialize the headlight ECU sub-assembly LH (set the zero point of the height control sensor in the headlight ECU sub-assembly LH) after the vehicle height changes due to replacement of suspension components or after performing such operations as removal and reinstallation or replacement of the rear height control sensor sub-assembly LH.
(b) Function of Main Components
| Component | Outline |
|---|---|
| Headlight ECU Sub-assembly LH | Receives various signals, calculates changes in the vehicle posture, and actuates the headlight leveling motor. |
| Headlight Assembly (Headlight Leveling Motor) | Based on the signals received from the headlight ECU sub-assembly, the motors move the reflectors in the headlight to vary the low beam. |
| Rear Height Control Sensor Sub-assembly LH | Transmits a height control sensor signal to the headlight ECU sub-assembly. |
| Brake Booster with Master Cylinder Assembly (Skid Control ECU) | Transmits speed sensor signals to the headlight ECU sub-assembly. |
| Hybrid Vehicle Control ECU | Transmits a READY condition signal to the headlight ECU sub-assembly. |
| Main Body ECU (Multiplex Network Body ECU) | Transmits a headlight status signal to the ECU sub-assembly LH. |
| Combination Meter Assembly | If the system malfunctions, "Headlight System Malfunction Visit Your Dealer" will be displayed on the multi-information display in the combination meter assembly in accordance with the signal from the headlight ECU sub-assembly LH. |
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How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT:
Use the following procedure to troubleshoot the automatic headlight beam level control system (for Triple Beam Headlight).
*: Use the Techstream
PROCEDURE 1.
Initialization
INITIALIZATION NOTICE:
The necessary procedures (adjustment, calibration, initialization or registration) that must be performed after parts are removed and installed, or replaced during headlight
Problem Symptoms Table
PROBLEM SYMPTOMS TABLE NOTICE: If the headlight ECU sub-assembly LH has been replaced, it is necessary to synchronize the vehicle information and initialize the headlight ECU sub-assembly LH. Click he
SEE MORE:
ECM Communication Stop Mode
DESCRIPTION Detection Item Symptom Trouble Area ECM Communication Stop Mode Any of the following conditions are met:
Communication stop for "Engine" is indicated on the "Communication Bus Check" screen of the Techstream.
Click here
Communication system DTCs (DTCs that start wit
Inspection
INSPECTION PROCEDURE 1. INSPECT BENCH TYPE REAR SEAT CUSHION COVER (REAR SEAT CUSHION HEATER ASSEMBLY RH) (a) Check the bench type rear seat cushion cover (rear seat cushion heater assembly RH). NOTICE: Disconnect the connector B from the rear seat cushion heater assembly LH before checking it. (
