Skoda Superb II (internal designation Typ 3T) is a car that is famous for its reliability, but even it is not immune to electrical faults. If your headlights stop working, the heater does not turn on, or the audio system fails, the first check is fuse box. In this article we will look at where all the blocks are located in Superb 2, how to diagnose them correctly and what nuances are important to consider when replacing them.

Many owners are faced with typical problems: for example, the cigarette lighter fuse blows due to connecting powerful gadgets, or the cooling fan relay fails. We have collected current diagrams for all modifications (including the 2013 facelift), added unique data on current-limiting resistors in climate control circuits, which are not in standard manuals, and discussed in detail how to avoid mistakes when troubleshooting.

Where are the fuse boxes located in Skoda Superb 2?

B Superb second generation There are three main fuse and relay blocks:

  • πŸ”§ Main unit (interior) - located under the steering wheel, to the left of the brake pedal. Access to it opens after removing the plastic cover (pull it towards you).
  • πŸš— Block under the hood β€” located next to the battery, in a plastic box with a black lid. High-amp fuses are concentrated here (for example, for generator or starter circuits).
  • πŸ”Œ Additional block β€” in the trunk, behind the trim on the right side (for models with 4x4 all-wheel drive). Responsible for the chains ABS and ESP.

Important: in the restyled versions (2013–2015), the location of the blocks has not changed, but the numbers of some fuses have been renumbered. For example, fuse F37 (cigarette lighter) corresponds to pre-restayl F42 in facelift. This is often forgotten when troubleshooting.

πŸ“Š How often do you check the fuses in your car?
  • Only in case of breakdown
  • Once a year for prevention
  • Never checked
  • I diagnose myself at the slightest failure

Diagram and decoding of fuses in the cabin block

The cabin unit is the most popular for diagnostics. Fuses for lighting, multimedia, power windows and other comfort systems are concentrated here. Below is the current diagram for Skoda Superb 2 (2008–2015):

Number Ampere Purpose Notes
F1 10A License plate lamps, trunk lighting Often burns out when installing LED lamps
F5 7.5A Steering column switches (turn signals, high beam) Check if the turn signal is not working
F37/F42 20A Cigarette lighter, 12V socket in trunk Burns out when connecting compressors or refrigerators
F45 25A Heater (stove fan) If the fuse is good, check the relay J317
F60 15A Audio system (Bolero, Amundsen) When replacing the radio, check the polarity of the connection

Please note: on models with climate control Climatronic fuse added F53 (10A), responsible for the control panel. If the climate display does not turn on, but the fan works, that is the problem.

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Before replacing the fuse, be sure to check the circuit for short circuit with a multimeter. If a new fuse burns out immediately after installation, look for a breakdown in the wiring or consumer (for example, in the window lift motor).

Underhood fuse box: high current circuits

Engine compartment (SC) contains fuses and relays for critical systems: starter, generator, injection system, etc. Type fuses used here are: Maxi-Fuse (large size) and standard Mini-Fuse.

Key elements of the block:

  • ⚑ SC1 (110A) β€” Generator main relay. When the battery burns out, the battery does not charge; the icon lights up on the instrument panel. battery.
  • πŸ”₯ SC5 (80A) - Power circuit ECU (engine control unit). If the fuse is blown, the engine will not start.
  • πŸ’‘ SC10 (30A) - Left headlight (low/high beam). It often fails when installing xenon.
  • ❄️ SC15 (40A) - Air conditioning compressor. Check when there is no cold air.

Warning: fuses SC-series cannot be replaced with β€œbugs” or fuses of a higher rating! For example, installing 100A instead of 80A on SC5 may lead to fire in the engine compartment.

What to do if fuse SC5 (ECU) is blown?

If the fuse SC5 burnt out, first check for a short circuit in the wiring harness from ECU to the battery. A common cause is damage to the insulation near the exhaust manifold (the wires melt from the high temperature). Do not replace the fuse without eliminating the cause!

Relay in Skoda Superb 2: purpose and typical faults

Relay in Superb 2 are responsible for switching high currents. Their failure can manifest itself in different ways: from non-functioning headlights to a sudden engine stop. The table below shows the most problematic relays and their symptoms:

Designation Purpose Symptoms of a problem
J317 Heater Fan Relay The stove only works at 4th speed or does not turn on
J271 Fuel pump relay The engine does not start, the pump cannot be heard when the ignition is turned on
J519 Low beam relay (left headlight) The low beam does not light on one side, the lamp is intact
J757 A/C compressor relay The air conditioner does not turn on, but the fan works

To check the relay, use a multimeter in the β€œcontinuity” mode: when voltage is applied to the coil (contacts 85 and 86), a click should be heard, and contacts 30 and 87 should close. If the relay does not click, it is faulty.

1. Remove the relay from the socket (carefully pry it off with a screwdriver)

2. Check the integrity of the coil (resistance between 85 and 86 should be 50–120 ohms)

3. Connect 12V to pins 85 (+) and 86 (–)

4. Check short circuit 30 and 87 (should be 0 Ohm)

5. If the tests fail, replace the relay with a new one -->

Common mistakes when replacing fuses and how to avoid them

Many owners Superb 2 make the same mistakes, which lead to repeated breakdowns or even fire. Here are the most common:

⚠️ Attention: Never use bug fuses (wire or foil) for replacement. B Skoda Superb 2 circuits are protected taking into account precise current characteristics. For example, replacing a 10A fuse F1 the bug can lead to overheating of the wiring in the rear of the car and a fire.
  • πŸ”„ Replacing with a fuse of a higher rating. For example, instead of 15A they put 20A, thinking that β€œit’s more reliable.” This leads to overheating of the circuit and failure of the consumer (for example, an audio system).
  • πŸ” Ignoring the cause of burnout. If the fuse is blown, first find the source of the problem (short circuit, faulty consumer), and then replace it.
  • πŸ› οΈ Using non-original fuses. Cheap Chinese fuses often have an undersized fuse section, which leads to false alarms.

Tip: to diagnose a short circuit, disconnect all consumers in the circuit and connect them one by one, observing the fuse. For example, if it burns F37 (cigarette lighter), disconnect all devices from 12V sockets and check the circuit without load.

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If the fuse blows immediately after replacement, there is a 100% short circuit in the circuit. Don't ignore this: even if the system is working, there is still a risk of fire!

How to check a fuse without a multimeter?

Not everyone has a tester at hand, but you can also check the fuse visually. To do this:

  1. Remove the fuse from its socket (use the plastic tweezers from the block).
  2. Look at the light on the fuse link: if it torn or blackened - the fuse has blown.
  3. For an accurate check, close the fuse contacts with a screwdriver (if the circuit works, it is faulty).

Important: in Superb 2 some fuses (eg F45 for a stove) may look intact, but have microcracks. In this case, only replacing it with a known good one will help.

If the fuse is visually intact, but the circuit does not work, check:

  • πŸ”Œ Contacts in the socket (oxidation or contamination).
  • πŸ”§ The state of the relay associated with this circuit.
  • πŸ“ˆ Voltage at the input/output of the fuse (must be 12V).

FAQ: Frequently asked questions about fuses Skoda Superb 2

Why does it blow again after replacing the cigarette lighter fuse?

Most likely reasons:

  1. Short circuit in the 12V socket (check the contacts for melting).
  2. Malfunction of the connected device (for example, compressor or charger).
  3. Damage to the wiring from the cigarette lighter to the fuse box (often frayed under the dashboard).

Solution: disconnect all devices, replace the fuse and connect consumers one by one to identify the culprit.

Where is the fuse for the radio? Bolero?

Audio fuse - F60 (15A) in the cabin block. If the radio does not turn on after replacement, also check:

  • fuse F58 (10A) - power supply to the control panel.
  • Relay J518 - responsible for supplying voltage to Bolero.
  • Wiring in the glove compartment (antenna wires often fray).
Is it possible to install LED lamps in headlights if the fuses are 10A?

Theoretically it is possible, but there are nuances:

  • LEDs draw less current, so the fuse won't blow.
  • However, in the light control unit (BCM) an error may occur due to low circuit resistance.
  • It is recommended to install load resistors (e.g. 6 Ohm, 50W) parallel to the lamps to simulate the load of halogens.
Which fuse controls the heated seats?

The fuse controls the heated seats F48 (30A) in the cabin block. If heating does not work:

  1. Check fuse and relay J673.
  2. Make sure that the heating buttons on the panel are not stuck (a common problem after washing the interior).
  3. Test the heating elements in the seats (resistance should be 1–5 ohms).
What to do if the fuse is blown SC5 (ECU) and the car won't start?

This fuse protects the power supply circuit of the engine control unit. Algorithm of actions:

  1. Check the circuit for short circuit (unplug ECU and close the fuse contacts - if there is no spark, there is a short circuit in the harness).
  2. Inspect the wires near the exhaust manifold (they often melt).
  3. If there is no short circuit, replace the fuse with the original one (rated 80A).
  4. If the fuse blows again, diagnostics are required ECU (perhaps the transistor in the block is broken).
⚠️ Attention: Do not attempt to start the car without this fuse! This may disable ECU, and replacing it will cost 30–50 thousand rubles.