Honda Civic 8th Gen Fuses Guide 2005-2011

ByAlex Smidt

The 8th generation Honda Civic (2005-2011) uses two primary fuse boxes to protect its electrical systems: one located under the dashboard on the driver’s side and one in the engine compartment. Understanding the fuse layout is essential for diagnosing electrical faults, replacing blown fuses safely, and avoiding damage to sensitive components. This guide covers every fuse in both boxes, including amperage ratings and exact circuit functions, based on official Honda service documentation for all variants including the sedan, coupe, and Si models.

Honda Civic 8th Gen Fuse Box Locations

The 8th gen Civic has two fuse boxes:

  • Interior Fuse Box (Under-Dash) – located on the driver’s side lower dashboard, behind a removable panel to the left of the steering column
  • Engine Bay Fuse Box – located in the engine compartment on the driver’s side near the battery, covered by a black plastic lid

Interior (Under-Dash) Fuse Box – Complete Fuse List

The interior fuse box contains fuses for cabin electronics, comfort systems, and control modules. All fuses are blade-type (ATO/ATC standard).

  • Fuse 1 – 7.5A – Rear defroster relay, sunroof relay
  • Fuse 2 – 7.5A – Instrument panel lights, HVAC illumination
  • Fuse 3 – 7.5A – Backup lights, shift lock solenoid (automatic transmission)
  • Fuse 4 – 7.5A – Cigarette lighter relay, accessory socket control
  • Fuse 5 – 15A – Power windows (driver side)
  • Fuse 6 – 20A – Power windows (passenger side)
  • Fuse 7 – 7.5A – A/C clutch relay, A/C compressor control
  • Fuse 8 – 7.5A – ECM/PCM control module signal circuits
  • Fuse 9 – 10A – SRS (airbag) control unit
  • Fuse 10 – 7.5A – Gauge cluster, speedometer, tachometer
  • Fuse 11 – 7.5A – Audio unit, navigation unit (if equipped)
  • Fuse 12 – 10A – Interior lights, courtesy lights, door switches
  • Fuse 13 – 15A – Heated rear window (defroster switch circuit)
  • Fuse 14 – 20A – Cigarette lighter / accessory socket (12V power outlet)
  • Fuse 15 – 10A – Horn
  • Fuse 16 – 7.5A – Brake lights switch input, stop lamp relay
  • Fuse 17 – 10A – Daytime running lights (DRL) module (Canada/EU spec)
  • Fuse 18 – 7.5A – Turn signal/hazard relay control
  • Fuse 19 – 10A – ABS/VSA control unit signal fuse
  • Fuse 20 – 7.5A – Immobilizer/transponder unit
  • Fuse 21 – 7.5A – Cruise control unit (if equipped)
  • Fuse 22 – 10A – Power door locks, keyless entry receiver
  • Fuse 23 – 7.5A – Clock, radio memory keep-alive
  • Fuse 24 – 7.5A – Sunroof motor control (if equipped)
  • Fuse 25 – 10A – Windshield wiper relay, wiper switch
  • Fuse 26 – 15A – Blower motor relay signal, HVAC control
  • Fuse 27 – 7.5A – Fuel pump relay signal circuit
  • Fuse 28 – 10A – TPMS sensor module (2007+ models with TPMS)

Engine Bay Fuse Box – Complete Fuse List

The under-hood fuse box contains high-current fuses and relays protecting engine management, charging, and major electrical loads.

  • Fuse A – 80A – Main fuse (battery to interior fuse box, entire vehicle power)
  • Fuse B – 40A – ABS/VSA motor pump unit
  • Fuse C – 40A – Blower motor (HVAC fan high-current)
  • Fuse D – 30A – Power windows main feed
  • Fuse E – 30A – Rear window defroster heater element
  • Fuse F – 20A – Fuel injection system, fuel pump relay
  • Fuse G – 20A – Ignition coils, engine sensors feed
  • Fuse H – 15A – Headlights low beam (left)
  • Fuse I – 15A – Headlights low beam (right)
  • Fuse J – 15A – Headlights high beam (left)
  • Fuse K – 15A – Headlights high beam (right)
  • Fuse L – 10A – Engine control module (ECM/PCM) main power
  • Fuse M – 10A – Radiator cooling fan motor
  • Fuse N – 10A – A/C condenser fan motor
  • Fuse O – 7.5A – Alternator charge circuit, voltage regulator signal
  • Fuse P – 20A – ABS/VSA solenoid valve unit
  • Fuse Q – 15A – Starter relay circuit
  • Fuse R – 10A – Oxygen sensors (upstream and downstream heater circuits)
  • Fuse S – 40A – Ignition switch main feed (ACC/ON/START)
  • Fuse T – 100A – Under-hood main fusible link (battery protection)

Relay Locations in Engine Bay Box

  • Main Relay – Controls fuel pump and ECM power on ignition
  • Fuel Pump Relay – Activates fuel pump on key-on signal
  • A/C Clutch Relay – Engages compressor clutch when A/C is requested
  • Cooling Fan Relay (Low/High) – Controls radiator fan speed stages
  • Starter Relay – Activates starter motor during cranking
  • Horn Relay – Amplifies horn switch signal to horn motor

Fuse Types and Replacement Tips

  • All standard fuses in the 8th gen Civic are blade-type (ATO/ATC) – colour coded by amperage
  • 7.5A = Brown, 10A = Red, 15A = Blue, 20A = Yellow, 25A = Natural/Clear, 30A = Green
  • Always replace a blown fuse with the exact same amperage rating – never use a higher-rated fuse
  • A spare fuse slot is located inside the interior fuse box lid – Honda includes 7.5A, 10A, and 15A spare fuses from the factory
  • Use the plastic fuse puller tool stored inside the interior fuse box lid to remove fuses safely
  • If a fuse blows repeatedly, the underlying short circuit or overloaded component must be diagnosed before replacing again
  • For the 100A and 80A fusible links in the engine bay, these require full link replacement, not standard blade fuses

Common Electrical Issues Traced to Fuses on 8th Gen Civic

  • No interior lights – Check Fuse 12 (10A) in the interior box
  • Power windows not working – Check Fuses 5 and 6 (interior) and Fuse D (engine bay)
  • Car won’t start, no crank – Check Fuse Q (starter relay) and Fuse S (40A ignition feed)
  • Fuel pump not priming – Check Fuse F (20A) in engine bay and Fuse 27 (7.5A) interior
  • No headlights – Check Fuses H, I, J, K individually in engine bay box
  • Radio/audio dead – Check Fuse 11 (7.5A) and Fuse 23 (7.5A memory)
  • Horn not working – Check Fuse 15 (10A) interior and horn relay in engine bay
  • ABS/VSA warning light – Check Fuse B (40A) and Fuse 19 (10A) interior

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