The second-generation Škoda Octavia was introduced in March 2004, built on the Volkswagen Group A5 (PQ35) platform. This article provides detailed fuse box diagrams, relay locations, and circuit assignments for the Skoda Octavia Mk2 (chassis code 1Z; PQ35 platform) produced between 2004 and 2013.
Below are the locations and layout diagrams for the fuse and relay boxes. Fuses for critical components such as the “Cigarette Lighter” and “Fuel Pump” are highlighted in bold.
Engine Compartment
To access the engine compartment fuse box, slide the release catches to unlock the cover and lift it off.
| Diagram | ||
|---|---|---|
|
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| No. | A | Description |
| 1 | - | Unassigned |
| 2 | 5 | Steering column combination switch |
| 3 | 5 | Diagnostic connector (OBD-II) |
| 4 | 30 | ABS hydraulic unit |
| 5 | 15 | Automatic transmission control unit (TCU) |
| 6 | 5 | Instrument cluster |
| 7 | - | Unassigned |
| 8 | 15 | Audio system / Head unit |
| 9 | 5 | Telephone control module |
| 10 | 5 | Engine control unit (ECU) relay power supply |
| 11 | 20 | Auxiliary heating and ventilation control unit |
| 12 | 5 | Data bus gateway control unit |
| 13 | 15 | Engine control unit (ECU) |
| 14 | 20 | Ignition switch circuit |
| 15 | 5, 15 | Oxygen sensor (Lambda sensor), fuel pump relay, glow plug relay |
| 16 | 30 | ABS control module |
| 17 | 15 | Horn |
| 18 | 30 | Audio amplifier |
| 19 | 30 | Windshield wiper motor |
| 20 | - | Unassigned |
| 21 | 15 | Oxygen sensor (Lambda sensor) |
| 22 | 5 | Clutch pedal switch / Brake pedal switch |
| 23 | 5, 10, 15 |
|
| 24 | 10 | EGR valve |
| 25 | 30 | Right headlight |
| 26 | 30 | Left headlight |
| 27 | 40 | Secondary air injection pump / glow plug circuit |
| 28 | 40 | Starter motor |
| 29 | 50 | Terminal 30 power supply |
| 30 | 50 | Terminal X (load reduction relay) * |
| R1 | - | Radiator fan relay |
| R2 | - | Automatic transmission control relay |
Passenger Compartment
Two fuse and relay panels are located in the cabin to protect the interior electrical circuits.
Main Fuse Box
To access the main passenger compartment fuse box, carefully lever off the dashboard side cover using a trim removal tool or flathead screwdriver.
| Diagram | ||
|---|---|---|
|
||
| No. | A | Description |
| 1 | 10 | Diagnostic connector, engine control unit, fuel pump |
| 2 | 5 | ABS / ESP control unit |
| 3 | 5 | Airbag control module (SRS) |
| 4 | 5 | Heater, air conditioning control unit, reverse lights |
| 5 | 5 | Headlight range adjustment control |
| 6 | 5 | Instrument cluster, automatic transmission control unit, electromechanical power steering control unit, park assist system |
| 7 | - | Unassigned |
| 8 | - | Unassigned |
| 9 | - | Unassigned |
| 10 | - | Unassigned |
| 11 | - | Unassigned |
| 12 | 10 | Central locking control unit |
| 13 | 10 | Exterior lighting control unit, brake lights |
| 14 | 5 | Automatic transmission control unit, gear selector lock |
| 15 | 7.5 | Interior lighting control unit |
| 16 | 10 | Climate control system (Climatronic / HVAC) |
| 17 | - | Auxiliary / Optional equipment |
| 18 | 5 | Park Distance Control (PDC) sensors |
| 19 | 5 | Traction control system (ASR) |
| 20 | 5 | Hill Hold Control (HHC) |
| 21 | - | Unassigned |
| 22 | 40 | Climate control blower fan |
| 23 | 30 | Front power windows |
| 24 | 25 | Cigarette lighter fuse (Škoda Octavia A5) |
| 25 | 25, 30 |
Heated rear window, auxiliary heater |
| 26 | 20 | 12V power socket in luggage compartment |
| 27 | 15 |
|
| 28 | - | Auxiliary equipment |
| 29 | 10 | Engine control unit (ECU) |
| 30 | 20 | Automatic transmission control unit (TCU) |
| 31 | 20 | Brake system vacuum pump |
| 32 | 30 | Rear power windows |
| 33 | 25 | Electric sunroof |
| 34 | 20 | Convenience control unit (BCM) |
| 35 | 5 | Anti-theft alarm system |
| 36 | 20 | Headlight washer system |
| 37 | 20 | Heated front seats |
| 38 | 30 | Heated rear seats |
| 39 | - | Unassigned |
| 40 | 40 | Heater blower fan |
| 41 | 15 | Tailgate window wiper |
| 42 | 15 | Windshield washer pump |
| 43 | 15 | Trailer hitch wiring |
| 44 | 20 | Trailer hitch wiring |
| 45 | 15 | Trailer hitch wiring |
| 46 | 5 | Heated windshield washer nozzles |
| 47 | 5 | Auxiliary heater relay |
| 48 | - | Unassigned |
| 49 | 5 | Main light switch |
Auxiliary Relay Panel
An auxiliary relay carrier panel is located beneath the dashboard on the driver's side (under the steering column).
| Relay Panel Diagram (Type 1) | |
|---|---|
| Upper Carrier Panel | |
|
|
| No. | Description |
| D1 | Auxiliary coolant heater relay (models with independent heater) or Low-heat output relay (models with PTC auxiliary heater) |
| D2.1 | Horn relay |
| D2.2 | Fuel pump relay (petrol engines: BUD, CGGA, BSE, BSF, CMXA, CHGA) or Auxiliary fuel pump relay -J832- (diesel engines: CLCA, CLCB, CFHF, CFHC, CEGA) |
| D3 | High-heat output relay (models with PTC auxiliary heater) |
| D3.1 | Fresh air blower relay (models with independent auxiliary heater) |
| D3.2 | Auxiliary heater fuel dosing pump relay -J749- (models with independent auxiliary heater) |
| D4 | Starter relay |
| D5.1 | Windshield wiper relay |
| D5.2 | Glow plug / heating element relay (engine code CAYC) |
| Lower Carrier Panel | |
|
|
| No. | Description |
| 1 | Terminal 15 power supply relay |
| 2 | Heated rear window relay |
| 3 | Terminal 50 power supply relay / starter relay 1 |
| 4 |
|
| 5 | Terminal X load reduction relay |
| Relay Panel Diagram (Type 2) | |
|---|---|
|
|
| B4 | Terminal 30 power supply relay |
| B5 | Heated rear window relay |
| B6 | Horn relay |
| B7 | Windshield washer pump relay 1 |
| B8 | Windshield washer pump relay 2 |
| B9 | Terminal X load reduction relay |
