Honda Civic EX 2004 - IDENTIFICATION
CAUTION: When battery is disconnected, vehicle computer and memory systems may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. See appropriate COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION before disconnecting battery.
Honda Civic EX 2004 - UNDER-DASH FUSE/RELAY BOX
NOTE: Under-dash fuse/relay box is located under driver's side of instrument panel. See Fig. 1.
Fig. 1: Honda Civic EX 2004 - Component Locations - Locating Under-Dash Fuse/Relay Box
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Fig. 2: Honda Civic EX 2004 - Component Locations - Identifying Under-Dash Fuse/Relay Box Components
Honda Civic EX 2004 Identifying Under-Dash Fuse/Relay Box Fuses
Fuse Number Fuse Name Amps Component or Circuit Protected 1 IG COIL 15A Ignition coils 2 LAF HEATER 20A A/F sensor 3 DAY LIGHT (10A) DRL control unit (Canada), Multiplex control unit 4 ALTERNATOR 10A A/F sensor relay, Alternator, CMP sensor, Cruise control unit, ELD unit, EVAP bypass solenoid valve, EVAP canister purge valve, EVAP canister vent shut valve, Secondary HO2S, VSS 5 - - Not used 6 P/W RELAY 7.5A Moonroof control unit, Moonroof open and close relays, Power window relay 7 SUNROOF (20A) Moonroof open and close relays 8 ACC RADIO 7.5A Audio unit, Multiplex control unit 9 RR WIPER
SIDE SRS (HX)10A OPDS unit (Side airbag), Rear window wiper intermittent control unit, Rear window wiper motor, Wiper/washer switch 10 METER 7.5A Back-up light switch, EPS control unit, Gauge assembly, Keyless receiver unit, Multiplex control unit, Security control unit connector (Honda accessory) 11 ABS (7.5A) ABS modulator-control unit 12 DAY LIGHT (7.5A) DRL control unit (Canada) 13 SRS 10A SRS unit 14 R/C MIRROR 10A A/C compressor clutch relay, A/C condenser fan relay, Blower motor relay, Heater control panel, Power mirror switch, Radiator fan relay, Recirculation control motor, Rear window defogger relay 15 OPTION FUSE 2A Security control unit (Honda accessory) 16 HEATED SEAT (20A) Not used 17 FUEL PUMP 15A ECM, PGM-FI main relay 2, SRS unit 18 ACC CIGAR 15A Accessory power socket 19 TURN LIGHT 7.5A Hazard warning switch 20 FR WIPER 30A Multiplex control unit, Windshield wiper/washer switch, Windshield wiper motor 21 - - Not used 22 AS P/W 20A Passenger's power window switch, Power window master switch 23 DR P/W 20A Power window master switch 24 - - Not used 25 - - Not used
Honda Civic EX 2004 - UNDER-HOOD FUSE/RELAY BOX
NOTE: Under-hood fuse/relay box is located in passenger's side of engine compartment, near strut tower. See Fig. 3.
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Fig. 3: Honda Civic EX 2004 - Component Locations - Locating Under-Hood Fuse/Relay Box
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Fig. 4: Honda Civic EX 2004 - Component Locations - Identifying Under-Hood Fuse/Relay Box Components
Honda Civic EX 2004 Identifying Under-Hood Fuse/Relay Box Fuses
Fuse Number Fuse Name Amps Component or Circuit Protected 1 CONDENSER FAN 20A Condenser fan relay motor, A/C compressor clutch relay 2 SMALL LIGHT 15A Taillight relay 3 INTERIOR LIGHT 7.5A Cargo area light, Ceiling light/spotlights ignition key switch/key light, Spotlights, Trunk light 4 COOLING FAN 20A Radiator fan relay 5 HAZARD 10A Hazard warning switch 6 FI ECU 15A PGM-FI main relay 1 7 HORN, STOP 15A Brake pedal position switch, Horn relay 8 ABS F/S 20A ABS modulator-control unit 9 BACK UP 10A Audio unit, DLC, Gauge assembly, Immobilizer control unit-receiver, Keyless receiver unit, Multiplex control unit 10 ABS MOTOR 40A ABS modulator-control unit 11 REAR DEFROSTER 30A Rear window defogger relay 12 HEATER MOTOR 40A Blower motor relay 13 POWER WINDOW 40A No. 7 and 23 fuses (in the under-dash fuse/relay box) 14 OPTION 40A No. 2, 3, 5. 15 and 16 fuses (in the under-dash fuse/relay box) 15 L HEADLIGHT 15A DRL control unit (Canada), DRL relay (Canada), Gauge assembly, Left headlight 15 L HEADLIGHT 20A DRL control unit (Canada), DRL diode (Canada), DRL relay (Canada), Gauge assembly, Left headlight 16 DOOR LOCK 20A Multiplex control unit 17 R HEADLIGHT 15A DRL relay (Canada), Right headlight 17 R HEADLIGHT 20A DRL control unit (Canada), Right headlight 18 EPS 60A EPS control unit 19 BATTERY 80A Batter, Power distribution 20 IG1 40A Ignition switch (BAT)
Honda Civic EX 2004 - Connector to Fuse/Relay Box Index Under-hood Fuse/Relay Box
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Fig. 5: Honda Civic EX 2004 - Component Locations - Under-hood Fuse/Relay Box Socket-To-Components/Circuit Protected Chart
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Fig. 6: Honda Civic EX 2004 - Component Locations - Identifying Under-hood Fuse/Relay Box Connectors
Honda Civic EX 2004 - Under-dash Fuse/Relay Box
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Fig. 7: Honda Civic EX 2004 - Component Locations - Under-dash Fuse/Relay Box Socket-To-Components/Circuit Protected Chart
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Fig. 8: Honda Civic EX 2004 - Component Locations - Identifying Under-dash Fuse/Relay Box Connectors
Honda Civic EX 2004 - Under-dash Fuse/Relay Box Removal and Installation
SRS components are located in this area. Review the SRS component locations and precautions and procedures before performing repairs or service. See appropriate AIR BAG RESTRAINT SYSTEMS article.
Honda Civic EX 2004 - Removal
- Make sure you have the anti-theft code for the radio, then write down the frequencies for the radio's preset buttons.
- Disconnect the battery negative cable, then disconnect the positive cable, and wait at least 3 minutes.
- Remove the driver's dashboard lower cover (see page 20-61).
- Disconnect the connectors from the fuse side of the under-dash fuse/relay box.
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Fig. 9: Honda Civic EX 2004 - Component Locations - Sliding The Under-Dash Fuse/Relay Box Down From The Bracket - Remove the mounting bolt, and slide the under-dash fuse/relay box (A) down from the bracket (B).
- Disconnect the back side from connectors from the back of the under-dash fuse/relay box, and remove the fuse/relay box.
NOTE: The SRS connector is a spring-loaded lock type (see appropriate AIR BAG RESTRAINT SYSTEMS article).
Honda Civic EX 2004 - Installation
- Install the under-dash fuse/relay box in the reverse order of removal and connect all connectors to the under-dash fuse/relay box.
- Install the driver's dashboard lower cover.
- Connect both the negative cable and positive cable to the battery.
- Enter the anti-theft code for the radio, then enter the customer's radio station presets.
- On '04 model, reset the power window control unit (see COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION).
- Confirm that all systems work properly.
- Do the engine control module (ECM) idle learn procedure (see appropriate COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION).
Honda Civic EX 2004 - Power Relay Test
Use this chart to identify the type of relay, then do the test listed for it.
NOTE: For the turn signal/hazard relay input test (see page 22-92).
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Fig. 10: Honda Civic EX 2004 - Component Locations - Identifying Relay Type Application Chart
Honda Civic EX 2004 - Normally-open type A
Check for continuity between the terminals.
- There should be continuity between the No. 1 and No. 2 terminals when power and ground are connected to the No. 3 and No. 4 terminals.
- There should be no continuity between the No. 1 and No. 2 terminals when power is disconnected.
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Fig. 11: Honda Civic EX 2004 - Component Locations - Normally-Open Type A Relay Schematic
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Fig. 12: Honda Civic EX 2004 - Component Locations - Identifying Normally-Open Type A Type 1 Relay Terminals
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Fig. 13: Honda Civic EX 2004 - Component Locations - Identifying Normally-Open Type A Type 2 Relay Terminals
Honda Civic EX 2004 - PGM-FI main relay 1, PGM-FI main relay 2
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Fig. 14: Honda Civic EX 2004 - Component Locations - Identifying Normally-Open Type A Type 1 Relay Terminals
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Fig. 15: Honda Civic EX 2004 - Component Locations - Identifying Normally-Open Type A Type 2 Relay Terminals
Honda Civic EX 2004 - Normally-open type B
Check for continuity between the terminals.
- There should be continuity between the No. 1 and No. 3 terminals when power and ground are connected to the No. 2 and No. 4 terminals.
- There should be no continuity between the No. 1 and No. 3 terminals when power is disconnected.
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Fig. 16: Honda Civic EX 2004 - Component Locations - Normally-Open Type B Relay Schematic
Honda Civic EX 2004 - Rear window defogger relay
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Fig. 17: Honda Civic EX 2004 - Component Locations - Identifying Rear Window Defogger Relay Terminals
Honda Civic EX 2004 - Blower motor relay
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Fig. 18: Honda Civic EX 2004 - Component Locations - Identifying Blower Motor Relay Type 1 Terminals
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Fig. 19: Honda Civic EX 2004 - Component Locations - Identifying Blower Motor Relay Type 2 Terminals
Honda Civic EX 2004 - Five-terminal type
Check for continuity between the terminals.
- There should be continuity between the No. 1 and No. 2 terminals when power and ground are connected to the No. 3 and No. 5 terminals.
- There should be continuity between the No. 1 and No. 4 terminals when power is disconnected.
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Fig. 20: Honda Civic EX 2004 - Component Locations - Five-Terminal Type Relay Schematic
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Fig. 21: Honda Civic EX 2004 - Component Locations - Identifying Five-Terminal Type Relay Type 1 Terminals
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Fig. 22: Honda Civic EX 2004 - Component Locations - Identifying Five-Terminal Type Relay Type 2 Terminals
