Description

Hyundai D4Ea, G4KA, G4FC 2010 Electrical Schematic

Hands up if you have ever chased a no-start on a 2010 Hyundai with a D4Ea diesel, tracing wires through three junction boxes because the aftermarket diagram showed the wrong relay pinout. That is exactly the kind of headache this Hyundai D4Ea, G4KA, G4FC 2010 Electrical Schematic exists to kill. 64 pages of factory-original wiring — not a reprint, not a generic drawing that covers “most models.” Each of the 64 pages carries the Hyundai part number and the OEM printer’s mark. The coolant fan circuit on page 3 alone will save you from guessing whether the radiator fan relay (high) gets its signal from the ECM or the ECT sensor (it is both, with a resistor pack in between — and the diagram shows it).

Starting System: Two Pages, One Wiring Path

Starting System-1 and Starting System-2 appear back-to-back for each engine family (UN, SA, TD). The diagram splits the start solenoid circuit into two conditions: with ignition lock and without. For the D4Ea diesel, the G4KA, and the G4FC gasoline engines, the magnet switch and the burglar alarm relay are shown with resistor values (3.0 Ω, 2.5R, etc.) right on the schematic. If you are swapping a starter on a G4FC and the replacement motor does not crank, verify the M61-8 connector pin B3 against the burglar alarm relay — the schematic puts that splice right at photo 45. No other manual I have seen labels the internal overrunning clutch and pinion gear engagement path on the same page. That matters when you are bench-testing a starter and need to confirm solenoid continuity to the flywheel side.

Cooling System: Fan Relay Sequencing for D4Ea, G4KA, G4FC

Cooling System sections (UN, SA, TD) are structured by displacement: 1.6 L for the gasoline engines, 2.0 L for the D4Ea diesel. The radiator fan relay (low) and radiator fan relay (high) are drawn with a shared resistor network. For the G4KA and G4FC, the ECM controls the low and high fan speeds through the ECT sensor. The D4Ea diesel uses an additional temperature switch at the radiator outlet. Both paths are color-coded: “HOT AT ALL TIMES” in red, “HOT WITH ENGINE NOT ON” in blue, “HOT WITH ENGINE CONTROL RELAY ON” in green. Each junction connector — JC101, JC301, JC401 — is photograph-referenced so you can locate them physically in the engine bay. Need the charge pressure? Page 73. (That is actually the cooling system page for the G4EA — the format holds true across all three engines.)

Blower & AC Control: Automatic vs. Manual Systems

Three pages for the automatic AC system (A) and three for the manual system (M) appear per platform. The automatic system uses a blower control module with a PWM signal from the HVAC controller; the manual system runs through a resistor block. Both sets show the AC compressor relay, the AC request switch from the control head, and the blower motor ground path. The manual for the D4Ea includes an additional high-pressure switch loop that bypasses the ECM on diesel models — that is a detail you will not find in any aftermarket diagram I have seen. If you are chasing an AC compressor that won’t engage on a G4FC, check the AC request signal at the ECM connector C101-K (pin 43) before condemning the compressor clutch.

SRS Systems: Two Pages per Engine, No Guesswork

Airbag systems are labeled SRS System-1 and SRS System-2 for UN and TD, and Air Bag for SA. Each two-page spread covers the driver and passenger squib circuits, the SRS control module (SRSCM), and the clock spring connections. The TD 1.6 SRS System-1 includes the passenger seat belt tensioner circuit and the side airbag wiring (if equipped). The schematic identifies the deployment loop resistance (2.0 Ω ± 0.2) at the squib connector — that spec is critical if you are using a digital multimeter to test circuit integrity. Never probe these circuits with a test light. The factory diagram shows the telltale ground paths through the SRSCM pins 58 and 57, which you can verify without removing the airbag module.

7 Systems Covered in the UN Platform

The UN section alone covers seven complete systems: Starting, Cooling, Charging, Blower & AC Control (Auto and Manual), SRS, Horn, Headlamps, Power Windows, Turn & Hazard Lamps, and Front Wiper & Washer (with and without rain sensor). Each system is split across multiple pages — Power Windows runs four pages for the SA platform, three for UN and TD. The schematics use a consistent connector numbering convention (e.g., M61-8 is the 8-pin connector at the junction box, photo 45). The table of contents lists each bookmark by page name, so you can jump directly to Headlamps System-1 without scrolling through turn signals.

3 Reasons OEM Documentation Beats Aftermarket

First, the OEM schematic includes photograph references. When it says “PHOTO 11” next to the E/R junction box on the starting system page, there is actually a photo in the full service manual that shows that junction box location. Second, the resistor values are printed on the wire lines — 0.5R, 3.0R, 2.5R — so you can verify circuit resistance without guessing. Third, the color codes are consistent across all three platforms (UN, SA, TD) for the same wire function. Aftermarket manuals will lump the D4Ea and G4FC together under one generic diagram. This factory manual separates them page by page: starting system for G4EA/G4FC has different pin assignments at the C02 connector than the D4Ea version.

Source Validity: What You Are Buying

This is a digital access of the original Hyundai electrical schematic published in 2010. The file name — Hyundai_D4EA-G4KA-G4FC_2010_Electrical_Schematic_en-31724018301.pdf — matches the OEM part number system. The PDF retains the original pagination and bookmarks. There is no watermark, no reprint, no third-party scanning artifact. Every wire, connector, and relay is drawn to factory scale. If you have worked with aftermarket schematics that show 10-amp fuses where the factory calls for 30, you understand why the original matters.

Frequently Asked Questions

Does this schematic cover the SRS system for all three engines?

Yes. The UN platform includes SRS System-1 and SRS System-2 for the D4Ea, G4KA, and G4FC. The SA platform has a dedicated Air Bag section. Each covers squib circuits, clock spring, and tensioner wiring.

What page shows the cooling fan relay for the G4KA?

Page 3 of the UN Cooling System section. It shows the radiator fan relay (high and low) with the resistor pack and the ECM-controlled fan relay control signals. The D4Ea cooling layout is on page 4.

Can I use this diagram to diagnose a no-crank on a manual transmission G4FC?

Use the Starting System-2 page for the G4FC with manual transmission. It includes the transmission position switch bypass circuit and the burglar alarm relay path through the M61-8 connector. The starter solenoid and magnetic lever circuit are drawn separately for M/T and A/T.

Does it include the power window system?

It covers Power Windows System-1 through System-3 on the UN platform, System-1 through System-4 on the SA platform, and Power Windows-1 through -4 on the TD platform. Each page includes the master switch, motor, and door lock relay connections.

If you are working on a 2010 Hyundai with a D4Ea, G4KA, or G4FC engine and you need the actual wiring — the stuff that matches the connectors under the dash — this is the file. Access the Factory Manual now from AutoRepairManuals and stop borrowing someone else’s blurry scan.

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