Lexus NX: Problem Symptoms Table
Lexus NX Service Manual / Vehicle Exterior / Lighting (ext) / Automatic Headlight Beam Level Control System (for Triple Beam 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.
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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 probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
- Inspect the fuses related to this system before inspecting the suspected areas below.
| Symptom | Suspected Area | Link |
|---|---|---|
| Automatic headlight beam level control system does not operate (Left Headlight) | Headlight unit assembly LH | |
| Headlight ECU sub-assembly LH | | |
| Automatic headlight beam level control system does not operate (Right Headlight) | Headlight unit assembly RH | |
| Headlight ECU sub-assembly RH | |
READ NEXT:
Terminals Of Ecu
TERMINALS OF ECU CHECK HEADLIGHT ECU SUB-ASSEMBLY LH (a) Disconnect the A19 headlight sub-assembly LH connector. (b) Measure the resistance and voltage according to the value(s) in the table below.
Diagnosis System
DIAGNOSIS SYSTEM DESCRIPTION (a) Lighting system data and the Diagnostic Trouble Codes (DTCs) can be read from the Data Link Connector 3 (DLC3) of the vehicle. When the system seems to be malfunctioni
Dtc Check / Clear
DTC CHECK / CLEAR CHECK FOR DTC (a) Connect the Techstream to the DLC3. (b) Turn the power switch on (IG). (c) Turn the Techstream on. (d) Enter the following menus: Body Electrical / AFS / Trouble Co
SEE MORE:
If the electronic key does not operate
properly
If communication between the
electronic key and vehicle is interrupted or the electronic
key cannot be used because the
battery is depleted, the smart
access system with push-button
start and wireless remote control
cannot be used. In such cases, the
doors can be opened and the hybrid
system
Precaution
PRECAUTION CAUTION:
While the auxiliary battery is connected, even if the power switch is off, the brake control system activates when the brake pedal is depressed or the door courtesy switch is turned on. Therefore, during servicing of the brake system components, do not depress the brake pedal
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