Tag Archives: headlights

Volkswagen Golf Auto Headlights above 140kph

The Golf has a feature turned on by default in countries that have the “auto” european light switch.

The only requirements are the Central Electronics Controller (09) of type 3C0 XXX XXX XX, a RegenLichtSens (RainLightSensor) and the european light switch.

The operation of the system is

  • Lights turn on at 140kph (actual speed not speedometer speed)
  • Lights turn off after 10 minutes driving under 80kph (again actual speed) or 10 minutes stopped (with or without ignition turned off)

Disable Auto Headlights above 140kph

  1. Open the Central Electronics Controller (09)
  2. Click the drop down box and choose the RegenLichtSens (RainLightSensor)
  3. Note the software coding (00)208933 (most cars have different codings)
  4. Convert to Hex 3 30 25
  5. Remove 1 from the left hand value Hex 2 30 25
  6. Convert to Decimal (00)143397 and replace the old coding.

Enabling Auto Headlights above 140kph

Perform the above but instead of removing 1 from the left hand value you add 1.

Options

  • +1 = Highway Light
  • +2 = Rain Light
  • +4 = Rain Closing

The left hand value has the following options.

  • 0 = No option
  • 1 = Highway Light (1)
  • 2 = Rain Light (2)
  • 3 = Highway Light (1) + Rain Light (2)
  • 4 = Rain Closing (4)
  • 5 = Highway Light (1) + Rain Closing (4)
  • 6 = Rain Light (2) + Rain Closing (4)
  • 7 = Highway Light (1) + Rain Light (2) + Rain Closing (4)

Conversion can be down with the windows calculator as shown in the images (windows 10 in programmer mode)

Step 1: Enter the existing as decimal and this converts to hex, note down the hex value.

volkswagen_golf_auto_headlights_01

Step 2: Select hex, enter the hex value you want (in this case ALL the options) and note the decimal value.

volkswagen_golf_auto_headlights_02