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
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Operation Check
OPERATION CHECK AUTOMATIC HIGH BEAM SYSTEM OPERATION CHECK (a) Check the operation of the automatic high beam indicator light. *a Automatic High Beam Indicator Light NOTICE: If the forward recognition camera cannot correctly recognize the front due to bad weather (dense fog, etc.) or obstru
Reassembly
REASSEMBLY CAUTION / NOTICE / HINT HINT:
Use the same procedure for the RH and LH sides.
The procedure listed below is for the LH side.
PROCEDURE 1. INSTALL FRONT DOOR UPPER OUTSIDE MOULDING PAD (a) When using a new front door upper outside moulding sub-assembly LH: (1) Clean the surface of
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