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2023 Lexus RX350
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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 |
|---|---|---|
| 2023 | Lexus RX350 | — |
The BRAKE mate is a trailer brake control system that allows you to control trailer brakes from your vehicle. It connects to your vehicle's electrical system and includes a brake control unit that mounts under the dash, circuit breakers for power management, and a prewired connector that attaches to your trailer.
The manual does not specify which vehicle makes, models, or years are compatible with the BRAKE mate. Contact Cequent Towing Products technical service at (888) 521-0510 or consult a fitment database to confirm compatibility with your specific vehicle.
Yes. Step 4 of the installation instructions requires connecting the 4-pole flat connector to the vehicle's connector, which means your vehicle must already have a 4-pole flat connector. If your vehicle does not have one, the BRAKE mate cannot be installed using these instructions.
The kit includes: 1 prewired connector, 1 heavy duty flasher, 1 20 amp circuit breaker, 1 40 amp circuit breaker, 5 #10 G-ring connectors, 2 3/8" G-ring connectors, 5 Scotch locks, 8 self-tapping screws, and 6 wire tie straps.
The manual does not specify required tools. However, based on the installation steps, you will likely need a drill (to create a firewall hole if one does not exist), wire strippers, a screwdriver (for self-tapping screws), and possibly a crimper or pliers for ring connectors. Contact technical service at (888) 521-0510 for a complete tool list.
The manual does not specify whether the battery must be disconnected before installation. Contact Cequent Towing Products technical service at (888) 521-0510 for safety guidance before beginning work.
Mount the bracket for the round connector on the bumper if that is where you intend to install it. Some hitches have built-in brackets, so check your hitch first before mounting a separate bracket.
Mount the brake control unit under the dash onto something firm. The unit must be securely fastened to a solid surface.
Mount the 2 circuit breakers (20 amp and 40 amp) end to end on the firewall within reach of the BLUE/BLACK cable. Secure them with the self-tapping screws supplied in the kit.
You may need to drill a hole through the firewall to run the BLUE/BLACK 2-strand wire from the engine bay into the cab. Look for an existing spot first; if none is available, drill a hole and seal it with a rubber grommet or silicone to prevent water and debris from entering the cab.
Some hitch brackets may need to be cut to allow the various connectors to pass through. Check your specific hitch bracket during installation; if it blocks connector passage, you will need to cut it.
Yes. In step 9, you must cut the black wire to create two open ends. These ends are then fitted with ring connectors and attached to the 40 amp and 20 amp circuit breakers respectively.
WHITE = ground wire; BLUE/BLACK = 2-strand power and trailer brake wire (runs from rear connector to front of vehicle and through firewall); RED = power wire from brake control unit; BLUE = trailer brake wire from brake control unit; GREEN = wire from brake control unit to brake switch.
Connect the WHITE ground wire to the frame of the vehicle. This provides the ground connection for the system.
Run the BLUE/BLACK 2-strand wire along the frame rail to the front of the vehicle, avoiding the exhaust, axles, and brake cables. Secure it with the plastic tie straps supplied. Then run it up the firewall, avoiding the steering mechanism, and secure it with ties.
Split the BLUE/BLACK 2-strand wire down the middle. Connect the RED (power) wire of the brake control unit to the BLACK wire using a Scotch lock. Connect the BLUE (trailer brake) wire of the brake control unit to the BLUE wire using a Scotch lock. Connect the WHITE wire of the brake control unit to the ground on the vehicle body. Connect the GREEN wire of the brake control unit to the inactive side of the brake switch.
Run a heavy gauge wire from the battery or equivalent power source to the battery side of either circuit breaker. Attach a #10 G-ring connector to one end of the wire. Then split a wire off this main wire to the 20 amp breaker using a Scotch lock and attach a #10 G-ring connector to the end of this wire. Alternatively, you can run a jumper between the two breakers.
The circuit breakers protect the electrical system. The 40 amp breaker is connected to the auxiliary side of the wire going to the rear connector. The 20 amp breaker is connected to the auxiliary side of the wire going through the firewall to the brake control unit.
The heavy duty flasher is a replacement turn signal flasher. If your turn signals blink too fast after installation, replace your vehicle's original turn signal flasher with the one supplied in the kit.
After attaching the round connector with self-tapping screws, test the connector for: running lights, brake lights, turn signals, and hot wire (power). Note that the brake control output cannot be tested unless a trailer is connected to the connector.
If the turn signals are blinking too fast after installation, replace the turn signal flasher with the heavy duty flasher supplied in the BRAKE mate kit.
After drilling a hole through the firewall to run the BLUE/BLACK wire into the cab, seal the hole with a rubber grommet or silicone to prevent water and debris from entering the vehicle.
When running the BLUE/BLACK 2-strand wire along the frame rail and up the firewall, avoid the exhaust, axles, brake cables, and steering mechanism. These components can damage the wire or be damaged by it. Secure the wire with the supplied plastic tie straps.
Your vehicle must have a 4-pole flat connector. Contact Cequent Towing Products at (888) 521-0510 or check a fitment database to confirm compatibility with your specific make, model, and year.
The kit includes a prewired connector, brake control unit, 20 amp and 40 amp circuit breakers, 5 #10 G-ring connectors, 2 3/8" G-ring connectors, 5 Scotch locks, 8 self-tapping screws, 6 wire tie straps, and a heavy duty flasher.
You may need to drill a hole through the firewall to run the brake wire into the cab if an existing hole is not available. The hole must be sealed with a rubber grommet or silicone.
Connect WHITE (ground) to frame, RED (power) to BLACK wire, BLUE (trailer brake) to BLUE wire, GREEN to brake switch, and run BLUE/BLACK from rear connector through firewall to brake control unit.
Test for running lights, brake lights, turn signals, and hot wire (power). Brake control output cannot be tested without a trailer connected. If turn signals blink too fast, replace the flasher with the one supplied.
Avoid routing the BLUE/BLACK wire near the exhaust, axles, brake cables, or steering mechanism. Secure all wires with the supplied plastic tie straps.
Yes, the T-One® Connector (part 118884) is designed for Lexus RX350 and RX500 models. For the most current information regarding specific application years and trim levels, visit www.horizonglobal.com.
Required tools: safety glasses, Phillips screwdriver, wire stripper, wire crimper, 10 mm socket, ratchet, drill with 3/32" drill bit, heat gun, and test light. A trim panel tool is also helpful for removing interior panels.
Yes. You must locate the vehicle's battery, disconnect and isolate the negative battery cable before beginning installation. The negative cable is reconnected after the fuse holder and power wire connections are complete.
Yes. You must drill a 3/32" hole to secure the white ground wire using the eyelet and screw provided. Do not drill into the vehicle floor, bed, or any exposed surfaces. Always verify what is behind the surface before drilling to avoid damage to the vehicle or personal injury.
The product uses a 15-amp fuse installed in the fuse holder. The fuse is initially removed during installation (step 8) and reinstalled after the negative battery cable is reconnected (step 12).
The power wire is 12 gauge (12 ga.) black wire. It connects from the vehicle's positive battery terminal (via a ring terminal and fuse holder) to the black power wire on the T-One® Connector's black box using yellow heat shrinkable butt connectors.
After installation, test and verify the installation with a test light or trailer. For the initial test, reset the vehicle electrical system by temporarily removing the key from the ignition. Ensure all connections are complete and all removed interior panels are reinstalled without pinching or cutting wires.
The T-One® Connector (part 118884) is a trailer lighting module designed for Lexus RX350 and RX500 vehicles. It provides a 4-flat connector interface for trailer lighting by tapping into the vehicle's existing taillight wiring harness on both the driver and passenger sides. The module includes a black box that mounts inside the vehicle and connects to the vehicle's battery through a fused power circuit.
If your Lexus is equipped with the Start/Stop option, you must connect the module only to the main vehicle battery. Do not connect the module power wire to the support battery. Failure to connect to the main vehicle battery may result in damage to the module.
The hardware kit includes: Perma Seal butt connectors (yellow heat shrinkable), ring terminal, #8 screw, 15-amp fuse, double-sided tape, fuse holder, 3/32" drill bit, 10 mm socket, fish wire, and 6" wire ties. Two yellow heat shrinkable butt connectors are provided for the power wire connections.
On both the driver and passenger sides, you must remove the plastic threshold cover, cargo trays, and the side panel to expose the vehicle's taillight wiring harness. Use a trim panel tool, Phillips screwdriver, or 10 mm socket. Be careful not to break the mounting tabs. These panels are reinstalled after the T-One® Connector installation is complete.
Mount the black box on the driver's side using the double-sided tape provided. First, clean the flat mount surface area with a 50-50 mixture of rubbing alcohol and water to ensure proper adhesion. Choose a suitable mounting point near where the ground wire will be secured.
On the driver's side, locate the vehicle's taillight wiring harness connector and separate it carefully without breaking the locking tabs. Insert the T-One® Connector end containing the yellow wire between the vehicle and taillight connector. Repeat on the passenger's side with the green wire. Ensure all connector surfaces are clean and free of dirt before insertion.
Route the harness containing the green wire from the driver's side to the passenger side. Pass the wire across the threshold and behind the passenger's side felt panel to reach the taillight pocket. Ensure the wire is not pinched or damaged during routing.
Drill a 3/32" hole near the black box to secure the white ground wire. You can drill a new hole or use an existing ground stud if available. 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. Clean dirt and rustproofing from the area before securing the white wire with the eyelet and screw provided.
After disconnecting the negative battery cable, cut the fuse holder wire and attach the ring terminal to the vehicle's positive (+) battery cable. Connect the other end of the fuse holder to the black 12 ga. wire using a yellow heat shrinkable butt connector. Route the black 12 ga. wire from the front of the vehicle rearward along the frame rail, avoiding hot pipes, heat shields, fuel tank, and other points that may pinch or break the wire. Connect the other end to the black power wire on the T-One® Connector's black box using another yellow heat shrinkable butt connector.
Use a heat gun to heat the yellow heat shrinkable butt connector. Start heating from the center of the splice connector and work outward to the edges on each end until the tubing shrinks and sealant flows. Allow the connector to cool completely before inspecting the splice to ensure a proper seal.
The T-One® Connector uses four main wires: yellow wire (driver's side taillight connection), green wire (passenger's side taillight connection), white wire (ground connection to vehicle chassis), and black wire (12 ga. power connection from vehicle battery). The 4-flat connector harness is routed through the driver's side panel and threshold into the storage compartment when not in use.
Always wear safety glasses during installation. Do not touch the negative battery terminal to the positive battery terminal, as serious injury and damage to the vehicle's electrical system can occur. Do not exceed the towing manufacturing rating stated in your vehicle owner's manual or the specific amperage ratings on the product. Verify what is behind any surface before drilling to avoid damage to the vehicle or personal injury. Do not drill into exposed surfaces. Avoid pinching or breaking wires during routing and reinstallation of panels.
After installation is complete, test and verify the installation with a test light or trailer. For the initial test, reset the vehicle electrical system by temporarily removing the key from the ignition. Ensure all connections are complete and properly seated. All connector surfaces should be clean and free of dirt, and all locking tabs should be fully engaged.
Clean the 4-flat connector after each use. Perform a pre-trip inspection of the 4-flat harness to ensure no damage to terminals and connection points for proper lighting connection and operation. Ensure the 4-flat harness does not get pinched in door latches, trailer connection points, or contact the road surface. Clean the connection and add dielectric grease (sold separately) to the terminal pins to maintain proper electrical contact.
Check that the T-One® Connector ends are fully inserted and locked in place. Remove the module's power fuse for 10 seconds and repeat the test. Also check chassis grounds and ensure ring terminals are in full contact with the vehicle chassis. If the issue persists, remove the module's power fuse.
Ensure the fuse is fully inserted into the fuse holder with no breaks. Verify the fuse holder is connected properly to the positive post of the battery. Remove the fuse for 10 seconds and repeat the test. Ensure the module is connected to B+ (positive battery). Using a tester or voltmeter, check for voltage on either side of the yellow butt connector near the module. If installation may have activated circuit protection, start the vehicle and turn all functions off (tail/headlights, brake, and turns), then remove the module power fuse for 10 seconds and repeat the test.
Possible causes and solutions: 1. T-One® Connector ends not fully inserted or locked - ensure they are fully inserted and locked in place, remove module power fuse for 10 seconds, and repeat test. 2. Poor chassis grounds - check chassis grounds and ensure ring terminals are in full contact with vehicle chassis, remove module power fuse. 3. Fuse issues - ensure fuse is fully inserted into fuse holder with no breaks, remove fuse for 10 seconds and repeat test. 4. Improper fuse holder connection - verify fuse holder is connected properly to positive battery post. 5. Module not connected to B+ - check voltage on either side of yellow butt connector near module using tester or voltmeter. 6. Circuit protection activated - start vehicle and turn all functions off (tail/headlights, brake, turns), remove module power fuse for 10 seconds and repeat test.
Check the following in order: 1. Fuse insertion - ensure the 15-amp fuse is fully inserted into the fuse holder with no breaks. 2. Fuse holder connection - verify the fuse holder is connected properly to the positive post of the battery. 3. Module power - remove fuse for 10 seconds and repeat test. 4. Module connection - ensure the module is connected to B+ (positive battery). 5. Voltage check - using a tester or voltmeter, check for voltage on either side of the yellow butt connector near the module. 6. Circuit protection - if installation may have activated circuit protection, start the vehicle and turn all functions off (tail/headlights, brake, and turns), then remove the module power fuse for 10 seconds and repeat the test.
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