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2021 - 2022 Lexus UX250h
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Tekonsha T-One connector (also referred to as T-Connector) wiring harnesses are the fastest and easiest way to add an electrical connector to the back of your vehicle. These connectors are used to link the wiring from your vehicle to the trailer when towing. Tekonsha T-One connectors feature custom designs to fit each vehicle make and model based on manufacturer specifications. Plus, the Plug & Play connectors on the end of the wires make it easy to install. No cutting or splicing!
Tekonsha offers the largest, most complete line of T-One connectors. To install a Tekonsha T-One wiring harness, simply locate your vehicle's wiring harness connector typically behind the vehicle taillight - unplug the connection and insert the T-Connector into the vehicle's harness. It's that easy! So what are you waiting for? Hit the road with the peace of mind only Tekonsha can provide. Life's a Journey. Stop Often.
| BRAND: | TEKONSHA |
| PART NUMBER: | 118858 |
| WARRANTY: | LIMITED 1 YEAR WARRANTY |
| WEIGHT: | 1.5 LBS |
| UNIVERSAL OR SPECIFIC FIT: | SPECIFIC |
| CIRCUIT PROTECTED: | YES |
| HARNESS TYPE: | MALE FEMALE |
| TERMINAL QUANTITY: | 4 |
| WIRE COLORS: | BROWN, GREEN, YELLOW, WHITE |
| WIRE QUANTITY: | 4 |
| WIRE GAUGE: | 16 GA. |
| POWER LEAD REQUIRED: | YES |
| ELECTRICAL SYSTEM TYPE: | 3-WIRE SYSTEM |
| HARDWARE INCLUDED: | YES |
Tekonsha is a leading manufacturer of electronic trailer brake controllers, pioneering the category in the 1970s. The lineup spans proportional units such as the Prodigy P3 and Prodigy iD, time-delayed controllers, the wireless Prodigy RF, plus vehicle-specific wiring harnesses, adapters and trailer brake components engineered for smooth, predictable stopping at any speed.
Tekonsha Engineering Company began in 1964 building RV steps and mirrors. Within a few years it had found its real calling, and by the 1970s Tekonsha was pioneering the manufacture of electronic trailer brake controllers, the product category that still defines the brand. More than half a century later it remains the reference name in trailer braking and is part of the Horizon Global group alongside Reese, Draw-Tite, Fulton, Bulldog and Wesbar.
A brake controller is the component that tells a trailer's electric brakes how hard to work and when, and getting that right is the difference between a controlled stop and a shove from behind. Tekonsha builds both major types. Proportional controllers use an internal accelerometer to sense how quickly the tow vehicle is slowing and apply trailer braking to match, so light braking stays light and hard braking is immediate. Time-delayed controllers ramp to a preset output over a fixed interval, a simpler and more economical approach that suits occasional towing.
The current brake controller range covers most of that ground. The Prodigy iD pairs with a phone through Tekonsha's EDGE technology for setup and monitoring, the P3 offers storable settings for multiple trailers and a trilingual colour LED display, the Prodigy P2 adds a dimmable display and boost mode for heavier loads, and the Voyager keeps operation simple and dependable. The Prodigy RF mounts to the trailer itself and controls wirelessly, which suits rental fleets and drivers who swap tow vehicles.
Installation is supported by vehicle-specific brake control harnesses that plug into a factory connector rather than requiring cut-and-splice wiring, along with mounting brackets and adapters. Matched controller bundles pair a unit with the correct harness. Products are tested to meet and often exceed published industry standards.
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1 compatible vehicles
| Year | Make & Model | Notes |
|---|---|---|
| 2021 - 2022 | Lexus UX250h | Tow Harness T: Connector Assembly Drilling Required Install Time is 60 minutes |
The 2021-2022 Lexus UX250h Tekonsha Plug & Play T-Connector Adapter Trailer Wiring 118858 (Part #TK118858) fits the following vehicles: 2021-2022 Lexus UX250h. Always verify your specific year, make, and model before ordering.
Yes, the 2021-2022 Lexus UX250h Tekonsha Plug & Play T-Connector Adapter Trailer Wiring 118858 (Part #TK118858) is designed to fit the 2021-2022 Lexus UX250h.
The 2021-2022 Lexus UX250h Tekonsha Plug & Play T-Connector Adapter Trailer Wiring 118858 (Part #TK118858) fits 2021-2022 Lexus UX250h models. The 2022 model year is the last year covered by this part number. For newer models, check for an updated version.
The 2021-2022 Lexus UX250h Tekonsha Plug & Play T-Connector Adapter Trailer Wiring 118858 (Part #TK118858) Drilling is required for installation. Basic hand tools are typically all you need.
The T-One® T-Connector is a wiring harness that integrates a vehicle's taillight signals with a trailer connector. It uses a black box module to process the vehicle's taillight wiring (via green and yellow wires connected to the driver and passenger side taillight harnesses) and provides a 4-flat connector for trailer use. The system requires a 15 amp fuse and a ground connection to function.
The manual shows installation on a Lexus UX250 in the diagram. However, the manual does not provide a comprehensive list of compatible vehicles. Contact the manufacturer or your retailer to confirm compatibility with your specific vehicle model and year.
Required tools are: trim panel remover, 10 mm socket and ratchet or 10 mm wrench, drill with 3/32" drill bit, 1/4" socket, wire crimpers, wire cutters, Phillips head screwdriver, and test probe. You will also need safety glasses.
The kit includes: a black box module, green and yellow T-Connector ends, a white wire with eyelet and screw for grounding, a 12 gauge black wire, a yellow fuse holder with a 15 amp fuse, a yellow butt connector, cable ties, and a 4-flat connector. The manual does not specify quantities of cable ties or other consumables.
Yes. In step 7, you must disconnect the vehicle's negative (−) battery cable before connecting the fuse holder to the positive (+) battery cable. After completing the fuse holder connection, reconnect the negative battery cable in step 8.
You must open the rear hatch, temporarily remove the floor covering, remove the clips holding the threshold in place, and carefully pry up and remove the threshold. Open the side door and fold the rear seats forward. These components are reinstalled in step 11 after the T-Connector is secured.
The taillight wiring connectors are located on the driver and passenger sides of the vehicle near the floor and rear corners. They must be separated carefully to avoid breaking the locking tabs. All connector surfaces must be clean and free of dirt before inserting the T-Connector ends.
The T-Connector end with the green wire is inserted on the passenger's side first. The T-Connector end with the yellow wire is routed down the threshold and inserted on the driver's side. Both must be fully inserted with locking tabs in place.
Yes. You must drill a 3/32" hole to secure the white ground wire using the eyelet and screw provided. The hole should be drilled in a suitable grounding point near the black box, such as the vehicle's frame or crossmember. Do not drill into the vehicle floor or bed. Always verify what is behind the surface before drilling to avoid damage to the vehicle or personal injury.
Drill the hole in a suitable grounding point near the black box, such as the vehicle's frame or crossmember. Do not drill into the vehicle floor or bed, and do not drill any exposed surfaces. Clean dirt and rustproofing from the area before drilling. Verify what is behind the surface before drilling to avoid damage.
Instead of drilling and securing the white wire to the frame, you can route the white wire with eyelet to the vehicle's battery located in the rear on the passenger's side and connect it to the vehicle's negative (−) battery cable.
Locate the black power wire from the T-Connector box on the passenger's side and attach the black 12 gauge wire provided. Route the black wire to the vehicle's battery, avoiding areas that may pinch or break the wire. In step 7, disconnect the vehicle's negative battery cable, then attach the ring terminal from the fuse holder to the vehicle's positive (+) battery cable. Connect the other end of the fuse holder to the black 12 gauge wire using the yellow butt connector provided.
The system uses a 15 amp fuse installed in the yellow fuse holder provided. The fuse is installed in step 8 after the negative battery cable is reconnected. If the fuse is not already removed from the yellow fuse holder, remove it before cutting the fuse holder wire and attaching the ring terminal to the positive battery cable.
Green wire: connects to the passenger side taillight wiring harness. Yellow wire: connects to the driver side taillight wiring harness. White wire: ground connection to the vehicle frame or battery negative cable. Black wire: power connection to the vehicle battery positive cable. Yellow butt connector: joins the fuse holder to the black 12 gauge wire.
Route all wires carefully to avoid areas that may pinch, break, or melt the wire. The yellow wire is routed down the threshold from the passenger side to the driver side. The black wire is routed to the vehicle battery avoiding pinch points. Secure the remainder of the harness with the cable ties provided. Be careful not to pinch the harness in the door latch. The 4-flat connector should be stored in the rear cargo area when not in use and pulled through the door when needed.
Mount the T-One® T-Connector's black box module on a flat surface in an out-of-the-way place to prevent damage or rattling.
All connections must be complete for the T-One® T-Connector to function properly. Test and verify the installation with a test light or trailer once installed. For the initial test, reset the vehicle electrical system by temporarily removing the key from the ignition.
Do not exceed the lower of the towing manufacturer rating (including in your vehicle owner's manual) or the specific amperage ratings stated on the product. The manual does not specify the product's amperage rating; check the product label or contact the manufacturer for this specification.
Always wear safety glasses during installation. Read and follow all warnings and cautions printed on the tow vehicle's battery. Verify what is behind any surface prior to drilling to avoid damage to the vehicle and personal injury. Do not drill into exposed surfaces. Avoid areas that may pinch or break wires. Do not pinch the harness in the door latch. Overloading circuits can cause fires—do not exceed stated product ratings.
Store the 4-flat connector in the rear cargo area when not in use. When in use, pull the 4-flat connector through the door and close the door. Be careful not to pinch the harness in the door latch.
The manual shows installation on a Lexus UX250. For other vehicles, contact the manufacturer or retailer to confirm compatibility.
Trim panel remover, 10 mm socket/ratchet or wrench, 3/32" drill bit, 1/4" socket, wire crimpers, wire cutters, Phillips screwdriver, test probe, and safety glasses.
Yes, disconnect the negative battery cable in step 7 before connecting the fuse holder to the positive battery cable. Reconnect it in step 8 after the fuse holder connection is complete.
Yes, you must drill a 3/32" hole to secure the white ground wire to the vehicle frame or crossmember. Do not drill into the floor or bed, and verify what is behind the surface before drilling.
15 amp fuse, installed in the yellow fuse holder provided in step 8.
Test with a test light or trailer once all connections are complete. Reset the vehicle electrical system by temporarily removing the ignition key for the initial test.
Verify that all connections are complete. The manual states that all connections must be complete for the T-One® T-Connector to function properly. Check that: (1) both T-Connector ends (green and yellow wires) are fully inserted into the vehicle taillight connectors with locking tabs in place, (2) the white ground wire is securely connected to the frame or battery negative cable, (3) the black power wire is connected to the vehicle battery positive cable through the fuse holder, (4) the 15 amp fuse is installed in the fuse holder, and (5) the negative battery cable is reconnected. Test with a test light or trailer. If the system still does not function, reset the vehicle electrical system by temporarily removing the ignition key.
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