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Autopapyrus · Hyundai Tucson (3rd generation, TL)
https://autopapyrus.com/guides/hyundai/tucson/turn-signal-relay-diagnosis-and-replacement/
Compiled automatically from service literature and owner experience. Specs are for the typical configuration — check them against your exact car before you start.

Hyundai Tucson (3rd generation, TL): Turn Signal Relay Diagnosis and Replacement

Older Hyundai models (for example, a 2005 Elantra) have a removable turn signal relay, which is often confused with the newer-generation electronics. On the Tucson TL (2015-2018), an electronic module produces the flashing, and there is no separate relay to replace. Symptoms: turn signals don't flash, flash too fast, or don't work at all. Most often the cause is a burned-out bulb, a blown fuse, a poor connector contact, or the turn signal switch on the steering column. Replace the module last.

Difficulty: Medium Time: 30-60 minutes Steps: 8 Tools: plastic trim removal tool, Phillips screwdriver, multimeter or test light, set of spare fuses

Part

  • 🔩 The Tucson TL usually does not have a separate removable turn signal relay like older Hyundai models. The flashing function is handled by the electronic body control module (BCM / the interior fuse and relay box under the dash on the driver's left). Available options: the turn signal / hazard circuit fuse, the turn signal bulb (PY21W, amber), and the complete interior fuse and relay box. The complete box is special-order only, so check price and availability with your supplier
There's a full repair manual for this car Every system, wiring diagrams and torque specs — not just this job. Haynes AutoFix (online) and 2 more. See manuals →

Step by step

8 steps
  1. Check the flash rate. If it is twice as fast as normal, a bulb on one side has almost certainly burned out (front, rear, or side repeater). This is the module's normal response to a broken load. Replace the faulty bulb.
  2. If neither direction works and the hazard lights are dead too, open the interior fuse box cover (under the dash on the driver's left). The diagram is printed on the inside of the cover. Find the hazard / turn signal circuit fuse, pull it out with a fuse puller, and inspect the element. Replace it with a fuse of the same rating.
  3. If the fuse is good, turn the ignition on and test the hazard lights separately from the turn signals. If the hazards work but the turn signals don't, suspect the turn signal switch on the steering column. If nothing works, suspect the module or its power supply.
  4. To check the switch, remove the lower steering column cover (usually held by clips and 2-3 screws) and carefully disconnect the turn signal switch connector. Inspect the contacts for corrosion and breakage, and test continuity with a multimeter with the lever engaged.
  5. Inspect the fuse and relay box connectors for corrosion, burning, and loose terminals. Clean the contacts with electrical contact cleaner.
  6. If none of these checks help, the body control module (BCM / fuse and relay box) must be replaced or repaired. First disconnect the negative battery terminal and wait 5-10 minutes. Remove the lower trim panel on the left, disconnect the module connectors, and install a new module.
  7. After replacing the module, reconnect the battery and check the turn signals, hazard lights, parking lights, and brake lights. Some modules require coding or pairing to the vehicle, so it is better to have a complete module replacement done at a repair shop with diagnostic equipment.
  8. If the flashing is erratic after installing LED bulbs, the cause is low load. Go back to the stock bulbs or install load resistors.

Common mistakes and warnings

  • Before any work on the fuse box and connectors, disconnect the negative battery terminal. Do not install a fuse with a higher rating: this risks melting the wiring. Check the fuse locations and functions for your trim level against the diagram on the box cover. If replacing the module requires coding, take the car to a repair shop.