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Expert Answers about Lexus RX 350


  • Troubleshooting No Power at Factory Port on 2017 Lexus RX 350 without Factory Tow Package
  • If your 2017 Lexus RX 350 didn't come with the factory tow package then an additional harness with a powered converter is needed to actually activate the plug that you used to install the Tekonsha T-One Vehicle Wiring Harness # 118252. This Tekonsha harness is designed for vehicles that came equipped with the factory tow package. Unfortunately, the converter harness is not available as a separate item from the manufacturer so your only option is to get the Tekonsha T-One Harness # 118255...
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  • No Power To Trailer Connector After Installing On 2016 Lexus RX 350
  • I called my contact at Curt and asked about the installation of the wiring harness, part # 56083 on your RX 350. First you can call the dealership with the VIN and ask if it has a tow package. If so ask them where the fuses or relays may be. I did some research and was unable to find the relay or fuse location for towing. PTW2993. Turn on the headlights and use the turn signals to make sure you are getting a signal. If you do not show any power on that port, chances are the vehicle...
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  • Trailer Lights Not Working After Installing Wiring Harness on a 2015 Lexus RX 350
  • First, the trailer wiring harness # 56083 is only a fit if your 2015 Lexus RX 350 came with the factory tow package. If it did not then that could be why it isn't working. Or, if it does have the factory tow package, it could be a missing fuse or relay which you could find in the under hood fuse panel or the in cab fuse panel.
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  • No Lights On Trailer When Using Curt Wiring Harness # 56083 On 2010 Lexus RX350 Without Tow Package
  • On your 2010 Lexus RX350 without a tow package, you would need to use Tow Ready Custom Fit Vehicle Wiring, # 118478. I have included a link to the installation details below. This harness includes a circuit protected converter and requires a direct connection to the battery. This connection to the battery virtually eliminates power draw from the vehicles taillights, which protects the sensitive wiring. The Curt T-Connector Vehicle Wiring Harness with 4 Pole Connector, part # 56083 is for...
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  • Troubleshooting Lights Not Working After Curt T-Connector Vehicle Wiring Harness Installation
  • The Curt T-Connector Vehicle Wiring Harness # 56083 is intended as a factory replacement harness for the 2017 Lexus RX 350 with the tow package. It sounds like you may not have the tow package, although you would still have the gray plug at the back. If you did not have a black converter box already plugged into this then you will need the T-One Vehicle Wiring Harness # 118255. In order to verify this you could use a circuit tester like the # PTW2993 to ensure that power is getting to...
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  • Troubleshooting Installation of Curt T-Connector Vehicle Wiring Harness # 56083 on 2012 Lexus RX 350
  • It sounds to me like your 2012 Lexus RX 350 may not be equipped with an active tow package. The plug may be there but the necessary connections may be missing. I recommend checking with your local Lexus dealer to determine what is needed to activate the towing package. Another option would be to go with the T-One Vehicle Wiring Harness, # 118478. The T-One connector plugs directly into the existing wiring at the back of your taillights. Just make your ground connection, route the power...
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  • What Can I Do When My Hitch Bike Rack Interferes With My Brake Sesnor
  • Unfortunately, there is not a long term fix for this issue. Your 2017 Lexus RX 350 views your RockyMounts WestSlope 3 Bike Rack - 2" Hitches - Tilting - Wheel Mount, part # RKY10223, as an obstacle, especially when loaded with bikes. Your only solution is to disable the sensor while you are using the bike rack. You should still have use of the rear mounted camera, but you will not have use of the cars backup sensor while the bike rack is in use.
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  • Troubleshooting Fitment of WingBar Evo Crossbars # TH711220 on a 2017 Lexus RX 350 with Flush Rails
  • Sorry to hear about your issue! As far as the recommended distance between the WingBar Evo crossbars # TH711220, Thule recommends approximately 27-1/2 inches (700mm) of crossbar spread between the front of the front crossbar to the front of the back crossbar. I went ahead and attached a diagram that shows this recommendation. The crossbar spread is important because the rear crossbar will receive a different amount of wind resistance based on the distance apart.
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  • Trailer Wiring Harness # 118252 Not Working on a 2012 Lexus RX 350
  • The trailer wiring harness, # 118252, is for a 2012 Lexus RX 350 that came with a factory tow package. It sounds like your RX 350 does not have the factory tow package so you would need to use trailer wiring harness # 118478. If your vehicle is supposed to have the factory tow package (have the dealer run the VIN to determine if it does or does not have the tow package) then the missing components to make it active could be obtained through a dealer. I have included a link to the installation...
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  • Troubleshooting Electric Over Hydraulic Trailer Brakes Jerking When Brakes are Quickly Applied
  • A lot of things could be going on here. First, I would make sure that the P3 brake controller is set to Hydraulic mode, see instruction link (page 4, Set Brake Type section). If it is still in the electric mode that is most likely the issue. Next, you might have an intermittent power supply to the EOH (electric over hydraulic) controller on the trailer. Check the voltage display on the P3 brake controller and if the readings are all over the place then the brake output wire should be checked...
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  • Kick Sensor Not Working on a 2020 Lexus RX 350 After Hitch Installation
  • It does not look like the kick sensor can be moved on your 2020 Lexus RX 350. If the sensor required moving most manufacturers make a replacement trim panel that would relocate the sensor but there is not one for your Lexus and the manufacturer said that it is not required. I suggest first checking to make sure that when the Curt Trailer Hitch Receiver # C13272 was installed that the wiring and sensors were not somehow damaged or accidently disconnected. I have also seen a few that...
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  • Troubleshooting New Trailer Plug Not Working for 2021 Lexus RX 350
  • I'm not sure what wiring you purchased but if it's anything like the Curt T-Connector # C56217 for a 2021 Lexus RX 350 without the tow package then the system should be working once you get the module and fuse installed. If you aren't seeing power to the fuse then I recommend using your tester on the OEM plug pins to see if you find power anywhere there. If you still can't find any power I recommend taking your vehicle to your local Lexus dealer to have them look at your OEM wiring. It's...
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  • Troubleshooting Installation of Tekonsha Wiring Harness 10-Pin Connector on 2019 Lexus RX 350
  • Aside from what you already found, the best advice I can offer comes from another customer who installed the # 118255 on an RX 350. On the inside corner cover, pry up the center of the black plastic fastener and remove it. Reach under the cover with small pliers and squeeze a hidden second fastener's prongs to pop the cover loose. The white connector for the 10 pin adapter will have a black rubber sheath. It is located slightly up and out of sight toward the rear of the vehicle. I'm not...
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  • Troubleshooting No Trailer Lights With New Wiring on 2015 Lexus RX 350
  • Not necessarily. If your 2015 Lexus RX 350 came with the tow package then you just need the T-One # 118252, but if it doesn't have the tow package then you need the T-One # 118255 with the converter. The tow battery fuse slot would only be used if you were installing a 7-Way. Since the connector for the lights just have 4 pins for the trailer lights and ground I don't think it will really matter if you have a fuse in the tow battery slot or not. Before purchasing a wiring kit with the...
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  • No Power Using the Curt Vehicle Wiring Harness Part # 56083 on a 2010 Lexus RX 350
  • The Curt T-Connector Vehicle Wiring Harness part # 56083 that you installed on your 2010 Lexus RX 350 will only work on models with the factory tow package. If you do not have the factory tow package then the correct harness for you would be the Curt T-Connector Vehicle Wiring Harness part # C55563. This option will attach directly to the battery for power as you can see in the attached install video. If you have called the dealer with your VIN and confirmed that you do indeed have the...
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  • Trailer Hitch for a 2017 Lexus RX 350 F Sport to Carry Bike Rack
  • The Curt hitch part # C56434 would be a great choice for yor your 2017 Lexus RX350 F Sport as it's mostly hidden and has a great tongue weight capacity for carrying a bike rack. If you are in need of a bike rack the Hollywood Trail Rider # HR200Z would be a great option that's easy to load and very stable.
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  • Troubleshooting 4-Pole Wiring Harness Installation in 2011 Lexus RX 350
  • Curt 4-pole wiring harness # 56083, which fits your factory-tow-package-equipped 2011 Lexus RX 350, uses a square OEM connector to join the car's wiring. If your fuse is good then there may be a corrosion problem within the connectors. Disconnect the harness and check all contacts for signs of discoloration (even slight green or white discoloration can indicate corrosion that could cause a problem). Clean contacts as needed with a spray-on electrical contact cleaner. Since your fuse is...
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  • No Power to Trailer Wiring Harness on a 2012 Lexus RX 350
  • The trailer wiring harness # 118252 is designed to fit a 2012 Lexus RX 350 that came with the factory tow package. If your RX 350 did not come with the factory tow package then harness will not work. If you are unsure if your model has the factory tow package you can have a Lexus dealer run the VIN in their system and tell you how the vehicle is equipped. There are fuses if the vehicle has the factory tow package. under the hood in locations 43 and 44, and in the cab of the vehicle in...
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  • Troubleshooting Weld Nuts On 2012 Lexus RX 350 Stripping Bolts Of Curt Trailer Hitch Receiver C13143
  • I would be happy to help. Based on the issue you are describing it sounds like there is quite a bit of gunk in the weld nuts on your 2012 Lexus RX 350. I do not recommend trying to force the bolts in, and instead recommend using a M12x1.25 tap in the weld nuts to clean them up. You can pick one up for a local auto parts store, but you will want to be careful to not cross thread the weld nut. I included a video of the # C13143 being installed for you to take a look at.
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  • Troubleshooting Curt Vehicle Wiring Harness 56083 On 2021 Lexus RX 350 Not Having Power
  • The Curt T-Connector Vehicle Wiring Harness for Factory Tow Package # 56083 requires your 2021 Lexus RX 350 to have the factory tow package which includes a factory installed module to power the trailer lights. Since your harness does not have power I recommend checking that there is a module plugged into the 10 pin connector which may be inside the luggage compartment, on the passenger side below taillight, behind little plastic removable bin. If no module is plugged in you will need...
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