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Autopapyrus · Volkswagen Golf Mk6
https://autopapyrus.com/guides/volkswagen/golf/diagnosing-headlight-and-parking-light-wiring-relays-and-fuses/
Compiled automatically from service literature and owner experience. Specs are for the typical configuration — check them against your exact car before you start.

Volkswagen Golf Mk6: Diagnosing Headlight and Parking Light Wiring, Relays and Fuses

On the Golf Mk6, power for the headlights and parking lights runs through fuses in the engine compartment and in the cabin, and the bulbs are switched by the body control module (J519). So when something fails, check the bulbs and fuses first, then the grounds and connectors, and only after that the control module. A 2010 car with the 1.6 BSE engine is set up the same way in this respect as the other Golf Mk6 models.

DifficultyMedium Time1-3 hours Steps11

Key figures

  • Left headlight and left parking light fuse in the engine compartment
    30 A (F26). Check it in step 4 and replace it only with the same rating.
  • Right headlight fuse in the engine compartment
    30 A (F16). Check it in step 4 if only the right headlight is out.
  • Headlight range adjustment fuse in the cabin
    about 10 A. Check it in step 3 if only the range adjustment is faulty.

Check these values against the manufacturer’s specification for your vehicle before you start.

Diagram: where the headlight fuses are in the engine bay

Fuse box in the engine bay, seen from above10010030155205101540305050301010515105152010230 A fuse, top330 A fuse, center1Fuse box430 A fuse, right5Box part number stickerCheck F26 and F16 against the card on the coverTop view, box in the engine bayTap to enlarge
  1. 1Fuse box in the engine bay. Light fuses are here; remove the box cover.
  2. 230 A fuse at the top of the box. Match its number to the card on the cover and check it.
  3. 330 A fuse in the center of the box. Match its number to the card; replace only with the same rating.
  4. 4Large 30 A fuse on the right. Check its number on the card; replace only with the same rating.
  5. 5Sticker on the box. Match F26 (left headlight and side light) and F16 (right headlight) to the card on the inside of the cover.

Parts

5
№PartGenuine part no.
01 Blade fusescorrect rating
02 Low beam bulb N10320102
03 Parking light bulb N0177535
04 Harness repair connectorsif harness is damaged
05 Wire of matching gaugeif harness is damaged

Part numbers are from the manufacturer's original catalogue. Check them against your VIN before ordering.

Tools

6
  • Multimeter or test light
  • fuse puller
  • flat screwdriver
  • set of spare fuses
  • contact grease or contact cleaner
  • VAG diagnostic scanner (for reading body control module fault codes)
There's a full repair manual for this car Every system, wiring diagrams and torque specs — not just this job. Haynes and 36 more. See manuals →

Step by step

11 steps
  1. Identify the symptom. If one bulb is out, the most likely cause is the bulb itself, its socket or its connector. If a whole headlight is out, or the low beam and parking light on one side are out together, suspect a fuse, a ground or a connector. If the lights flicker, come on by themselves or won't turn off, suspect the body control module. Turn off the ignition and the lights, then start the checks.
  2. Check the bulbs. Remove the bulb and inspect the glass and the filament. Check the socket and contacts for carbon buildup, melting and corrosion. To test, install a known-good bulb.
  3. Locate the fuse box in the cabin. It is behind a cover on the end of the dashboard on the driver's side (visible when the door is open). Pry the cover off with a flat screwdriver. The fuses here that relate to the headlights are the headlight range adjustment fuse (about 10 A), the headlight washer fuse (about 20 A) and the central electronics module fuse (about 20 A).
  4. Locate the fuse box in the engine compartment. According to the Golf Mk6 wiring diagrams, the main lighting circuits run through 30 A fuses: the left headlight and left parking light are on F26, and the right headlight is on F16. The fog light and turn signal fuses are next to them. Diagrams differ between model years and trim levels, so check the numbers against the chart on the inside of the fuse box cover.
  5. Check the fuses. Pull each one with the fuse puller and look at the element against the light, or test it with a multimeter. Replace a fuse only with one of the same rating and color. Do not fit a higher rating and do not use makeshift "bug" bypasses. If a new fuse blows right away or within minutes, there is a short to ground: look for damaged harness insulation near the headlight, at the connector, and at the bend by the fender.
  6. Check the voltage at the bulb connector. Turn on the lights and connect a multimeter or test light to the connector contacts. You should see a voltage close to the vehicle system voltage (about 12-14 V). If there is no voltage, there is a break in the wire or a problem in the control circuit. If there is voltage but the bulb doesn't light, check the ground.
  7. Check the ground. Test the headlight ground wire to the body with a continuity check. The resistance should be close to zero. Clean a corroded ground point down to bare metal, tighten the fastener and treat it with contact grease. The torque for ground bolts is low, so tighten them moderately without stripping the threads (check the value against the manufacturer's specifications).
  8. Inspect the harness and connectors. Check the headlight connector and harness for kinks, chafing, moisture and corrosion. Repair a break by soldering with heat-shrink tubing or with waterproof crimp connectors, using wire of the same gauge and color.
  9. Connect the scanner and read the fault codes of the body control module and the lighting modules. They will point to a specific circuit: open circuit, short or bulb fault. If the module has data on the relays and lighting outputs, compare it with the results of your voltage check.
  10. If the bulbs, fuses, harness and grounds are all fine but the lights behave erratically (flicker, come on by themselves, won't switch off), the cause may be the body control module J519. Replacing it is done with equipment that can code and adapt the module to the car, so it is best to leave this part of the job to a shop with VAG diagnostic equipment.
  11. After the repair, clear the fault codes and check the operation of the parking lights, low beam, high beam, turn signals, fog lights and headlight range adjustment. Take a short drive and read the fault codes again.

Common mistakes and warnings

  • Disconnect the battery ground before working on the wiring, to avoid shorting a circuit and damaging the control modules
  • Do not install a fuse of a higher rating
  • It causes overheating and can set the harness on fire
  • If you have no experience with electrical work, take the car to a repair shop