Location of fuses and relays Škoda Superb 2 (1.8 TSI): detailed diagram with photo

Owners Škoda Superb II with turbocharged engine 1.8 TSI sooner or later they face the need to check or replace fuses. The electrical circuits of this car are protected by several blocks, and it can be difficult to find the right element without a diagram. In this article we will analyze in detail where all the fuses and relays are located, their purpose, and also give practical advice on diagnostics and replacement.

Feature Superb 2 with motor 1.8 TSI (CDAB, CDAA) — the presence of additional fuses for the turbine, injection system and electronic assistants. If your headlights, windshield wipers stop working, or errors appear on the dashboard, the first thing you should do is check the corresponding elements in the blocks SC (salon) and SB (under the hood). We've collected up-to-date diagrams, including rarely documented circuits such as the valve fuse N75 or fuel pump relay.

Where are the fuse boxes in the Škoda Superb 2 1.8 TSI

Installed in the car three main blocks with fuses and relays:

• 🔧 Cabin block (SC) — located to the left of the steering column, behind the protective cover. Responsible for lighting, multimedia and comfort systems.
• 🚗 Engine compartment (SB) — located next to the battery, under the plastic cover. Monitors engine power circuits, fans and automatic transmissions.
• 🔋 Additional relay block — hidden under the instrument panel on the driver’s side (on some modifications). Controls climate control and system Start-Stop.

To access the interior unit SC Simply pull the cover located at the driver’s left foot towards you. Engine compartment block SB requires removing the cover latches (carefully pry it off with a flat-head screwdriver). On models with a 1.8 TSI engine after 2011, the fuel pump relay was moved from the SB unit to the SC cabin module - this is important to take into account when diagnosing!

Diagram of the cabin fuse box (SC) with decoding

Salon block SC contains fuses and relays for most consumers related to comfort and safety. Below is a table with the purpose of each element (relevant for Superb 2 FL and pre-facelift versions).

Fuse no.	Denomination (A)	Purpose	Notes
SC5	10	Control unit ESP	When burned out, the icon lights up ESP OFF on the dashboard
SC15	15	Cigarette lighter, 12V socket	Often fails when connecting powerful devices
SC25	20	Central locking, alarm	Responsible for the operation of the key with buttons
SC30	7.5	Control unit Climatronic	If the climate control burns out, it goes into emergency mode.
SC42	10	Oil pressure sensor, DSG	Critical for boxes DQ250 - when there is a malfunction, shifts become abrupt

To replace the fuse in the block SC use plastic tweezers, which are located in the block itself (usually attached to the right). Never replace fuses with higher rated ones. - this may lead to a fire in the wiring. For example, installing 20A instead of 10A in a circuit ESP is fraught with failure of the control unit.

⚠️ Attention: On vehicles with the system KESSY (keyless entry) fuse SC25 is also responsible for the operation of the immobilizer. When replacing it, you may need to restart the system through the diagnostic scanner.

Underhood fuse box (SB): what protects

Block SB located next to the battery and contains power fuses and relays for the engine, cooling system and transmission. Special attention is required here:

• ⚡ SB3 (30A) — main relay of the injection system. If it fails, the engine will not start.
• 🔥 SB10 (20A) - fuel pump fuse. If the car does not start, but the starter turns, check it first.
• ❄️ SB15 (40A) — radiator fan circuit. Burnout leads to engine overheating.
• 🔄 SB22 (15A) — turbine valve relay (N75). If there is a malfunction, an error appears P2563.

To diagnose relays in the block SB You can use the “dialing” method: turn on the ignition and listen - a working relay makes a click. If there is no click, check the voltage at the contacts using a multimeter. For example, the fuel pump relay (SB10) should show 12V on the control contact when the ignition is turned on.

1. Turn on the ignition (without starting the engine)

2. Listen to the relay clicks (2-3 clicks should be heard)

3. Check the voltage at pin 85 (control) - it should be 12V

4. Replace the relay with a known good one (for example, from a fan circuit) for a test-->

On models Superb 2 with engine 1.8 TSI after 2013 in the block SB an additional relay has appeared for the system Start-Stop (SB28). Its malfunction leads to a constant flashing of the battery icon on the dashboard and failure of automatic engine shutdown.

Additional relay block: where to look and what it is responsible for

Little known fact: in Škoda Superb 2 1.8 TSI There is a third relay block that is often overlooked. It is located under the instrument panel on the driver's side, behind the plastic trim (next to the clutch pedal). This block contains:

• 🌡️ Heater fan relay (on models with Climatronic)
• 🔌 Heated windshield relay (if installed)
• 🚦 Turn signal and hazard warning relay

Access to this block is difficult - you will need to remove the bottom panel trim. We recommend using plastic spatulato avoid damaging the latches. Please note: on right-hand drive vehicles, the location of the block may differ (it is moved closer to the central tunnel).

How to remove the cover to access the additional unit?

1. Unscrew the two screws under the steering column (Phillips screwdriver).

2. Carefully pry the clutch pedal cover and pull it towards you.

3. Disconnect the backlight connector (if equipped) and remove the panel.

4. The relay block will be visible to the right of the pedal - it is mounted on a metal bracket.

⚠️ Attention: When working with an additional relay unit, be sure to disconnect the battery! The contacts here are not protected by fuses, and a short circuit can damage the control unit BCM (repair cost - from 30,000 rubles).

How to Diagnose a Bad Fuse or Relay

Checking fuses and relays does not require special equipment, but there are nuances that few people know about. Here are the step-by-step instructions:

1. Visual inspection: Remove the fuse and look at the light - the burnt thread will be visible. However microcracks sometimes invisible, so it is better to use a multimeter.
2. Testing with a multimeter: Set the circuit test mode (diode icon) and touch the fuse contacts with the probes. There must be resistance 0 ohm.
3. Relay test: Connect the relay to the battery (contacts 85 and 86 - managers, 30 and 87 - power). When submitting 12V on 85 and 86 there should be a click.
4. Circuit diagnostics: If the fuse is good, but the device does not work, check the voltage at its contacts with the ignition on. No voltage indicates a wiring break.

For engine 1.8 TSI It is critical to check the fuse SB10 (fuel pump) and relay SB3 (injection). If the car does not start, but the starter turns, follow the following sequence:

1. Check fuse SB10 (20A) - if it is burned out, replace it and try to start the engine.
2. If the fuse blows again, disconnect the fuel pump connector (under the rear seat) and recheck.
3. If the fuse does not light, the problem is in the pump. If it lights up, look for a short circuit in the wiring.

Frequent problems with fuses on 1.8 TSI: symptoms and solutions

Owners Superb 2 1.8 TSI often encounter typical faults related to fuses. Here are the most common cases and how to resolve them:

Symptom	Probable Cause	Solution
Windshield wipers don't work	fuse SC20 (25A) or relay SC/R3	Check for short circuit in windshield wiper motor
Low beam does not turn on	fuse SC7 (10A) or relay SB/R11	Replace the bulbs with lower-power LED bulbs if the fuse blows frequently
Error P0300 (multiple misfires)	fuse SB8 (10A) - ignition coil circuit	Check the coil resistance (should be 0.5–1.0 Ohm)
Heated seats don't work	fuse SC10 (30A) or thermal fuse in the seat cushion	Measure the resistance of the heating element (standard: 1–3 ohms)

The problem with fuse SB15 (40A)responsible for the radiator fan. On Superb 2 1.8 TSI after 2010, this fuse often blows due to the fan jamming. If you notice that the fan runs constantly or does not turn on when the engine warms up, follow these steps:

1. Check fuse SB15 (40A) and relay SB/R6

2. Disconnect the fan connector and apply 12V directly to it (it should turn on)

3. If the fan does not work, replace it (part number: 1K0 959 455 B)

4. Check the temperature sensor (should show a resistance of 200-300 Ohms at 20°C)-->

Another "disease" 1.8 TSI - fuse blown SC30 (7.5A)responsible for Climatronic. If the climate control has stopped responding to commands, but the fan is blowing, the problem may be in the control unit (article number: 3C8 907 044). Before replacing the unit, check the circuit for current leakage!

Tips for replacement and prevention

To avoid problems with fuses and relays, follow these guidelines:

• 🔄 Check regularly condition of contacts in blocks - oxidation leads to poor contact and overheating of fuses.
• 🛠️ Use only original fuses or high-quality analogues (for example, Hella, Bosch). Cheap Chinese elements may have a low value.
• 🔋 When installing additional equipment (for example, a DVR) connect it through a separate fuse, and not into existing circuits.
• 📋 Keep a log of replacements — record the dates and reasons for blown fuses. This will help identify systemic problems.

If you find the same fuse blowing frequently, don't limit yourself to replacing it. Look for the reason:

1. Check the circuit for short circuit using a multimeter in calls.
2. Inspect the wiring for chafing or melting (especially where it passes through the body).
3. For engine 1.8 TSI pay attention to the turbine and injector circuits - shorting them often leads to blown fuses.

⚠️ Attention: On vehicles with the system DSG-7 fuse SC42 (10A) protects the mechatronics circuit. Replacing it with an element with a higher rating can lead to failure of the gearbox control unit (repair cost - from 50,000 rubles).

FAQ: Frequently asked questions about fuses for the Škoda Superb 2 1.8 TSI

Where is the cigarette lighter fuse located?

The cigarette lighter fuse is located in the passenger compartment SC under number SC15 (15A). If after replacement it burns out again, check the 12V socket for a short circuit (a melted contact inside the connector is often to blame).

Why does the fuel pump fuse (SB10) blow?

Most often this is due to:

• Wear of the fuel pump (increased current consumption)
• Short circuit in the wiring from the pump to the control unit
• Relay failure SB3, which “sticks” and does not turn off the pump

To diagnose, disconnect the pump connector and check if the fuse is lit without load. If yes, the problem is in the wiring; if not, the pump is at fault.

Which fuse controls the radio?

The fuse is responsible for powering the radio. SC20 (10A) in the salon block. However, if the radio does not turn on, also check:

• fuse SC5 (10A) — control circuit (CAN bus)
• Relay SC/R12 - power supply for antenna amplifier

On restyled models (Superb 2 FL) the radio may not work due to a malfunction in the unit MIB - Re-flashing is required.

Is it possible to install fuses of a higher rating?

Absolutely not! Installing a fuse with a rating higher than the rated one can lead to:

• Melting wire insulation
• Failure of the control unit (for example, BCM or ECU)
• Wiring fire (especially dangerous in the fuel pump and injection circuits)

If a fuse constantly blows, look for the cause (short circuit or increased load) rather than increasing its rating.

Where can I find a fuse diagram for my modification?

Schemes may vary depending on the year of manufacture and configuration. The exact diagram for your Superb 2 1.8 TSI can be found:

• In the car service book (section "Electrical equipment")
• On the sticker on the back of the fuse box cover
• In the electronic catalog ElsaWin (access by VIN code)
• On specialized forums (for example, SkodaClub or Drive2)

For engines CDAB (until 2011) and CDAA (after 2011) schemes may vary - check by VIN.