How To Fix The Intelligent Light System Inoperative W204?

What is an Intelligent light system inoperative Mercedes no function error?  Like all equipment in cars, after a period of use, it will all break down and need repair. There are some errors that will be notified on the screen when they appear, the most important thing is that when we detect errors, we should fix them soon so that when participating in traffic, it is safe.

What is an Intelligent Light System?

Mercedes Benz intelligent light system (ILS) uses LED lights to enhance illumination 10m more than traditional headlights. Mercedes ILS uses xenon gas discharge headlights and advanced technology to control the projection of the lights up and down. In some models, the ILS can also increase the angle of light rotation when turning.


ILS problem

When you use it for too long or your LED module gets wet after a collision, your Mercedes intelligent light system may show symptoms like:

  • Lights don’t light up
  • Mode Glance when turning stops working
  • 1 side light does not light…

In this repair guide, the IC board shows an error: Intell. Light system no funciona

Warnings when ILS has a problem

When the ILS light has a problem, there will be cases where there will be no notification then you have to pay attention to the status of the light, and Normally, an error message will be displayed on the control panel:

  • Adaptive Headlights Inoperative
  • Intell.Light System inoperative
  • Intelligent Light System inoperative
  • Adapt. main beam system inoperative
  • Front right parking lamp
  • Front left parking lamp
  • Left daytime driving lamp
  • Front left turn signal
  • Front right turn signal
  • Parklicht vorne links
  • Parklicht vorne rechts
  • Blinker vorne links
  • Blinker vorne rechts
  • Abblendlicht links
  • Abblendlicht rechts
  • Blinker vorne links
  • rechts
  • ILS ohne Funktion

Error of left headlight displayed on Taplo

How to repair Mercedes intelligent light system?

Software and device requirements

Mercedes intelligent light system Troubleshooting steps:

After Fully prepare the necessary software and equipment, You will repair auto lamp function inoperative according to the following steps:
Step 1: Connect the Xentry Mercedes software to the vehicle

Step 2: Run the Xentry software – determine the software number

Run the Xentry software - determine the software number
Step 3 : Identify fault in HLC166
Step 4: Connect DTS Monaco to HLC166

Connect DTS Monaco to HLC166
Step 5: Reprogramming and select the coding item, select the function suitable for the vehicle

Reprogramming and select the coding item
Step 6: Go to Xentry and select Calibration to reset the control box

Go to Xentry and select Calibration to reset the control box
Step 7: Check the Mercedes intelligent light system and test drive

Check the lights and test drive
Support from Eurocartool

Above are the steps instructions on how to fix Intelligent Light System with encryption software. However, these operations require technicians with extensive experience in using encryption software. If you need assistance during Mercedes ILS repair or booking Mercedes auto light inoperative reset service, contact us WhatsApp: +13155472355 Our team of technicians is ready to assist you 24/7. You will surely be satisfied when using the service!

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