You opened the trunk Škoda Octavia A5But the lamp doesn't light up - a familiar situation? This problem occurs in the owners of the model 2004-2013 years of release, and the reasons can lie in both banal burnout of the light bulb and serious electrical wiring malfunctions. In 80% of cases, repairs take no more than 20 minutes if you know where to look.

In this article, we will discuss all possible causes of fuse (responsible for lighting the trunk) before the oxidation of contacts in the body control unit (BCM). You will learn how to check the lid opening sensor, where the lighting relay is located and why sometimes the problem is solved by simply cleaning the connectors. And if you do not want to dig into the wiring - we will give a checklist for quick diagnosis in the service.

1. Burned lamp: how to check and replace

The most obvious reason is the failure of the lamp itself. V Octavia A5 a standard lamp is used W5W (aka T10) 5 watts. Its service life is about 2-3 years, but with frequent openings of the trunk or vibrations, it can burn out earlier.

To check the lamp:

  1. Open the trunk and remove the lamplight - it is attached to two latches on the sides.
  2. Keep the lamp on your head (do not turn!).
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    If the lamp is intact, but covered with black plaque - this is a sign of overheating. Replace it even if it is still shining: it will soon burn out completely.

  3. Install a new lamp W5W (cost from 50 rubles). Check the polarity: on the plafond there are labels "+" and "-".

If the light does not turn on after the replacement, the problem is not the lamp. But before you dig deeper, make sure that:

  • 🔋 Contacts in the cartridge are not oxidized (clean them with alcohol or sandpaper).
  • 🔌 The lamp sits tightly in the nest - sometimes it just doesn't squeeze.
  • 💡 You have not confused the lamp with the overall (they look similar, but the power is different).

📊 What have you tried to do?
  • Changing the lamp.
  • Checked the fuse
  • Removed the ceiling light
  • Didn't do anything

2. F42 safety: where is it and how to check it

B Octavia A5 The fuse controls the trunk light F42 at 10 A, located in fuse box under the steering wheel (to the left of the pedals). To get to it:

  1. Open the block cover (pull the lower left corner).
  2. Find the fuse F42 It is the third in the upper row (see para. diagram below).
  3. Remove it with tweezers (there is a complete machine) and check the filament.

If the fuse is blown:

  • 🔧 Replace him with a new one. 10 A (no more!).
  • 🔍 Check if the wiring is short – if the new fuse immediately burns, look for a short circuit.
  • 🚗 If the fuse is intact, but the light does not work, the problem is in another (see below). (further sections).

fuse Denomination What protects Symptoms of a problem
F42 10 A Lighting of the trunk, illumination of the license plate There is no light in the trunk, but the dimensions work
F35 10 A Body control unit (BCM) Several systems do not work (windows, central lock)
F50 15 A Cigarette lighter, 12V socket Light in the trunk can flash when connecting the load
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If the light in the trunk does not work with the number illumination or stop lights - the problem is precisely in the fuse. F42 or relay J317.

3. Track Opening Sensor: Diagnostics and Repair

B Octavia A5 light-on end (sensor) of opening the trunk lid. It is located on the trunk lock (from the cabin side) and is a small button that is pressed when the lid is closed.

Signs of sensor malfunction:

  • 🚨 The light does not light up when opened, but it burns constantly when the trunk is closed.
  • 🔄 The lamp flashes or lights up every once in a while.
  • 🔊 When closing the trunk, a click is heard, but the light does not go out.

How to check and repair:

  1. Remove the trunk skin from the side of the lock (unscrew 2 screws). Torx T20).
  2. Find the sensor - it's a black plastic rod with a spring. Press it with a screwdriver: if the light is on, the sensor is working.
  3. If there is no reaction, check the wiring with a multimeter (should be the case). 12 V at the opening contacts).
  4. Contacts oxidized? Clean them up. WD-40 or replace the sensor (article) 1K0 905 253, price ~800 rub.).

What if the sensor is working but the light is not on?

If the sensor is working but the lamp is not responding, the problem may be in the body control unit (the lamp is not responding).BCM). In this case:

1. Check the voltage on the output T10/5 block BCM (It should be 12 V with the trunk open).

2. Drop the mistakes through VCDS (If you have access to diagnostic equipment)

3. If nothing helps, a re-flashing is required. BCM (contact service).

4. Wiring problems: where to look for a cliff or short circuit

If the lamp, fuse and sensor are in good condition, but the light is in the trunk Octavia A5 It still doesn't work, it's the wiring fault. The most common problems arise in three places:

  1. Truck plafond connector - oxidized or removed contacts.
  2. Burning wires near the trunk loop - the isolation is being rubbed.
  3. Body control unit (BCM) - corrosion on contacts T10/5 and T10/6.

How to check wiring:

  • 🔍 Multimeter ring the chain from the plafond to BCM (diagram below).
  • 🔧 If you find a cliff, clean and solder the wires, isolate them with thermal shrinkage.
  • ⚡ When short circuit (the fuse burns immediately after replacement) - look for bare wires near the trunk loop.

The connection of the luggage compartment light:



Truck platon


│


─ ─ ► Mass (body)


─ ─ ► Brown wire (+12V through fuse F42)


│


─ ─ ► Track Opening Sensor


BCM Block (Contact T10/5)

Call the chain from the plafond to BCM| Check the mass on the body (cleanness of contact)|Look at the tourniquet near the trunk loop |Check the voltage on the opening sensor

-->

5. Failure of the body control unit (BCM)

If all previous steps have not helped, the problem may be comfort block (BCM). B Octavia A5 It is located behind the dashboard on the driver's side. Signs of malfunction:

  • 🚗 Not working several systems at the same time (windows, central lock, light).
  • 🔄 The light in the trunk comes on randomly or flashes.
  • 🔧 In the diagnosisVCDS) there are errors on the tyre CAN.

What to do:

  1. Reset errors through a diagnostic scanner (sometimes a simple reset helps).
  2. Check the voltage at the contacts T10/5 (food) and T10/6 (Sensor signal)
  3. If the block does not respond, repair or replacement is required (the price of the new ~15 000 rubles, used ~5 000 rubles).

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Before replacement BCM be sure to remove the terminals from the battery for 10 minutes - this will reset the unit settings and sometimes solves the problem.

6. Relay of the luggage compartment lighting: where is it and how to check

In rare cases, the relay is to blame J317 (aka comfort relay), which controls the lighting of the trunk and cabin. V Octavia A5 it's in central relay block under the dashboard (near the BCM).

How to diagnose:

  • 🔧 Remove the relay and check the contacts for oxidation.
  • 🔄 Change it with similar places (for example, with the relay of heating glasses) - if the light is earned, the relay is faulty.
  • 💰 The cost of a new relay is ~1 200 rubles. (article) 1K0 951 253).

Attention: if after replacing the relay, the light in the trunk lights up, but after 5-10 seconds it goes out - the problem in the block BCMNot in the relay.

7. When to contact the service: 3 cases

Not all problems can be fixed on your own. Contact the service if:

  1. You rang the whole chain, but didn’t find a cliff – maybe the problem is tire CAN.
  2. Block BCM Does not respond to diagnosis or makes errors U1113, U0100.
  3. After replacing the fuse or relay, a new one immediately burns - this is a sign short circuit in the hidden part of the wiring.

The average cost of diagnosis in the service is 1,500-2,500 rubles. Repair of wiring will cost 3,000–5,000 rubles, replacement BCM with firmware - from 10 000 rubles.

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If the light in the trunk stopped working after washing or raining, 90% of the probability that the problem is in the oxidized contacts of the plafond or sensor. Dry them with a hair dryer and treat them WD-40.

FAQ: Frequent questions about light in the trunk Octavia A5

Can I drive without the light in the trunk?

This is not a serious problem, but according to the PDD (P.S.). 19.1) The lighting of the trunk shall be in operation at night. Fine - 500 rubles. (sic). 12.20 CAO.

Why does the light in the trunk always burn even when the trunk is closed?

It's a sign of sticking. opening-sensor Or short circuit in the wiring. Check the tip (see para. section 3) and ring the chain on the cliff.

Which lamp is better to put instead of a regular one? W5W?

You can install an LED lamp. T10 with plinth W5W (for example, Osram LEDriving or Philips X-tremeVision). But please note:

  • 🔋 The consumption of LED lamps is lower, so they may not work with the sensor.
  • 🔧 You may need to adjust the bridge (install a resistor).

After replacing the lamp, the light light lights up, but after 5 seconds it goes out. What's up?

This is a typical symptom blockage BCM. The unit "thinks" the trunk is closed and shuts off power. Diagnostics or reflashing is required.

Where to download the circuit Octavia A5 To check the wiring?

Official diagrams can be found:

  • 📄 In the manual ElsaWin (paid).
  • 🔗 On the forums Skoda-Club.ru or Drive2.ru (Free, but the quality may be low)
  • 📱 In the application CarScanner (there are basic patterns).

If you have tried all the ways, but the light is in the trunk Škoda Octavia A5 Write in the comments the symptoms (blinks / does not burn at all, if there are other malfunctions). Let's try to figure it out together!