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Autopapyrus · Hyundai Santa Fe (1st Generation, SM)
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Compiled automatically from service literature and owner experience. Specs are for the typical configuration — check them against your exact car before you start.

Hyundai Santa Fe (1st Generation, SM): Wiring the Fog Lights to the Factory Harness

The first-generation Hyundai Santa Fe (2001-2006) may not have factory fog light wiring in the base trim, or the wiring may be only partly present. To add fog lights, you will need to install a relay, a fuse and a switch, and run wires from the fuse box to the lights, with the relay triggered by the parking lights.

Difficulty: Medium Time: 2-3 hours Steps: 11 Tools: Socket/wrench set, Phillips and flat-blade screwdrivers, electrical tape, multimeter, terminal crimping tool

Part

  • 🔩 Fog light assemblies (left and right), fog light relay (4-pin, 30/40A), fog light switch (installed in the panel or in place of a blank cover), 15A fuse, wiring: 1.5-2.5 mm² for power circuits
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Step by step

11 steps
  1. Disconnect the negative battery terminal before starting work.
  2. Open the hood and find the fuse and relay box in the engine compartment, on the left side of the engine. Check whether there is a fog light relay socket and a fuse slot for FRT FOG 15A. On some vehicles the socket is there but the relay is not installed.
  3. If there is no relay or fuse socket, use a free slot in the under-hood box to install a 4-pin relay (terminals 30-87-85-86 per the ISO standard).
  4. Run a power wire from relay terminal 30 to the positive battery terminal or to the nearest power bus in the fuse box (through the 15A fuse).
  5. Relay terminal 87 is the power output to the fog lights. Run two wires (1.5-2.5 mm²) from terminal 87 to the left and right fog lights in the front bumper. If the bumper has mounting locations with blanking covers, remove the covers, install the light assemblies and secure them with screws or clips.
  6. Relay terminal 85 is ground (negative). Connect it to the nearest body ground point or to the common ground bus in the fuse box.
  7. Relay terminal 86 is the control signal from the switch. So that the fog lights work only when the parking lights or headlights are on, run a wire from terminal 86 to the positive wire of the parking lights (usually in the light switch circuit on the steering column or in the fuse box). Find the wire that shows +12V when the parking lights are turned on. Use a multimeter.
  8. Install the fog light switch in the instrument panel (in a free blanking cover slot, or integrated into the multifunction light switch if your vehicle is the prepared version). Connect one switch terminal to the relay control wire (terminal 86) and the other to ground.
  9. Check that all connections are secure. Insulate any bare sections with heat-shrink tubing or electrical tape. Make sure the wires do not touch hot or moving engine parts.
  10. Reconnect the negative battery terminal, turn on the parking lights, then turn on the fog light switch. Both fog lights should come on. Also test switching the parking lights on and off. The fog lights should turn off when the parking lights are turned off.
  11. Adjust the aim of the fog lights with the adjustment screws on the housing. The beam pattern should be wide and low, and should not dazzle oncoming drivers.

Common mistakes and warnings

  • Do not connect the fog lights directly to the switch without a relay. The high current (5-10A per light) will overheat the contacts and could cause a fire. Always use a relay and a fuse. If some factory wiring is already present behind the panel or in the bumper (connectors under blanking covers), use it. This simplifies the installation and gives you factory-quality connections.