G4R-H22 12V 4-Pin Power/Accessory Relay - Replaces OE 39792-SE0-003/39792-SE0-004 (Stamping 056700-7410) - Compatible with Honda Civic 2000-2004; Civic Si 2002-2005

G4R-H22 12V 4-Pin Power/Accessory Relay12V DC 4-blade relay for accessory power and HVAC blower circuits. Match by stamping and 4-pin layout for an accurate replacement.SpecificationsCoil voltage: 12V DCTerminals: 4 male blade (mini-relay footprint)Markings: G4R-H22 / G4R-1A21T-H22; common stamping: 056700-7410OE ReferencesOE references: 39792-SE0-003, 39792-SE0-004Common stampings on original units: 056700-7410, G4R-1A21T-H22Function & LocationSwitches battery power to loads such as the heater blower motor or accessory circuitsTypically located in the engine-room fuse/relay box or under-dash relay panel (check your diagram)CompatibilityCompatible with Honda Civic 2000, 2001, 2002, 2003, 2004; Civic Si (EP3) 2002, 2003, 2004, 2005 when equipped with the OE/stamping numbers above. Always verify the part number/stamping on your original relay and the socket location before ordering.

• SPEC & OE MATCH: 12V DC, 4-pin blade relay marked G4R-H22 (marking variant G4R-1A21T-H22). Replaces OE 39792-SE0-003 (stamping 056700-7410) and 39792-SE0-004. Standard mini-relay footprint; verify the stamping (e.g., “G4R-H22” or “056700-7410”) and 4-pin layout on your original unit for a precise match before ordering.
• INSTALL & FUNCTION: Typically installs in the engine-room fuse/relay box or under-dash relay panel, depending on vehicle. Supports accessory power and HVAC blower circuits; a failing relay can cause an inoperative or intermittent blower, or accessories not powering up. Confirm socket position with the fuse/relay diagram, check coil continuity on the removed relay, and fully seat the new relay to ensure reliable contact.
• FITMENT—CIVIC (BY YEAR): Compatible with 2000 Honda Civic [Heater Blower/Accessory Power] Relay; 2001 Honda Civic [Heater Blower/Accessory Power] Relay; 2002 Honda Civic [Heater Blower/Accessory Power] Relay; 2003 Honda Civic [Heater Blower/Accessory Power] Relay; 2004 Honda Civic [Heater Blower/Accessory Power] Relay. Match by OE 39792-SE0-003/39792-SE0-004 and stamping 056700-7410 or G4R-1A21T-H22.
• FITMENT—CIVIC SI (EP3, BY YEAR): Compatible with 2002 Honda Civic Si (EP3) [Engine-Room Power/Accessory] Relay; 2003 Honda Civic Si (EP3) [Engine-Room Power/Accessory] Relay; 2004 Honda Civic Si (EP3) [Engine-Room Power/Accessory] Relay; 2005 Honda Civic Si (EP3) [Engine-Room Power/Accessory] Relay. Verify the engine-room fuse box position and ensure the 4-pin layout and markings correspond.
• INTERCHANGE & COMPLEMENTARY PARTS: Interchanges with units stamped 056700-7410 or G4R-1A21T-H22 where a 12V 4-pin power/accessory relay is specified. To fully resolve blower or accessory issues on compatible vehicles, also inspect complementary components such as the blower motor resistor, blower fuse, blower motor, accessory fuse, and ignition-switch feed; addressing these together can prevent recurrent faults.