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Expert Answers about Toyota Highlander


  • Troubleshooting K-Source Universal Towing Mirrors That Folded In When Passing A Semi Truck
  • I have not seen any customer feedback stating that the K-Source Universal Towing Mirrors # KS3891-2 have folded in when a semi truck passes by in the opposite direction, although I can see a big rig doing so if the tow mirrors were not completely tightened and secured to your factory mirrors. If the tow mirror itself folded in then I would make sure the screw on the back of the tow mirror is tight to reduce movement - do not overtighten since the housing is plastic. Also make sure that...
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  • Primus Brake Controller Sets Off Warning Lamps on 2010 Toyota Highlander w/Manual Override is Used
  • It sounds like you do not have the red brake controller wire attached to the correct wire on the brake switch. There is more than one wire that will have power with the brake pedal pressed. You need the one that only has power with the pedal pressed and no power at any other time such as with the headlights on or the turn signals engaged. On a 2010 Toyota Highlander the correct wire should be the light blue wire on the brake switch. The Voyager brake controller you used to have also is...
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  • Troubleshooting Redarc Trailer Brake Controller Issue Flashing Red on a 2019 Toyota Highlander
  • It sounds like you are having a ground issues on your trailer while using the Redarc Tow-Pro Liberty Brake Controller # RED24FR with your 2019 Toyota Highlander. The small amount of voltage you are seeing at your 7-way from the brake wire is what tells the controller you are connected to a trailer as it completes a circuit. This small amount of voltage is not enough to activate the brake magnets to slow the trailer. I recommend starting by checking the ground connections at the 7-way and...
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  • Need Replacement Trailer Wire Harness For 2019 Toyota Highlander
  • Using a tester like Digital Multimeter with 42" Long Test Leads - LED Display # PT89ZR I would test the wiring starting at the factory plugs/connections and work your way back seeing if there is a short or bad ground. As well as checking all of your fuses just to be certain. If that doesn't work you can either have a dealer check it out and charge you an arm and a leg to fix it or you can bypass the factory tow package completely with the ZCI Circuit Protected Vehicle Wiring Harness w/...
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  • Troubleshooting Trailer Wiring Running Light Circuit on 2005 Toyota Highlander
  • Since you've tested your trailer with a direct 12V power source and confirmed that it is not the problem, I suggest you first focus on the item that is most often the cause for the kind of issue you describe: the trailer wiring harness ground wire. If the ground on the Highlander's wiring harness is not solidly affixed to a clean bare metal surface it may be able to pass enough current for on-and-off signals like brake and turn lights but may not be able to handle the steady current draw...
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  • Troubleshooting No Right Brake and Turn Signals When a Curt Echo is Installed
  • I spoke to the techs over at Curt, and they recommended checking to make sure the 3 o'clock port on the # C51180 is not bent to the point of not making contact when the trailer is plugged into it. This can cause there to be no continuity to the right-side lights and blinkers. However, if that looks good, you will need to use a tester, something like the # PTW2993, to see if there is any power coming out of that same 3 o'clock port when the # C51180 is plugged into the vehicle and the blinker...
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  • Troubleshooting Curt T-Connector # 56042 on a 2017 Toyota Highlander
  • The first thing that you want to do is troubleshoot the Curt T-Connector 4-Way # 56042 itself. You can do this with a circuit tester like part # PTW2979. If you are getting signals then that means you likely have a short or damaged wiring on your trailer. If you don't get signals then you either need some fuses or relays on your 2017 Toyota Highlander. There could be wiring damage on your Highlander but I doubt it since the vehicle is so new. If the problem is on your trailer side check...
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  • LED Trailer Lights Stay on Dim with Curt Wiring Harness C56217 on a 2013 Toyota Highlander
  • Curt trailer wiring harnesses that have a powered converter like # C56217 do have this issue on trailers with LED lights. What is happening is because the converter is using 12 volt vehicle power to power the trailer lights, it is always energized. When the vehicle is off and the trailer lights are not activated normally there is a small amount of power flowing through the system. Since LED lights draw very little power the slight amount of juice flowing through the system will light up...
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  • Installing 7-Way Junction Box to Avoid Use of Wiring Adapters
  • Since your 7-way-equipped trailer's lights and brake's function when connected to the 7-way on your Highlander you ought to be able to detect those same signals on the vehicle's 7-way socket using a circuit tester like # PTW2993 when no trailer is connected. Those signals should be present either way. Make sure your tester is properly grounded when you test the circuits. Given the choice of using or not using any type of adapter, I always suggest avoiding them whenever possible. Extra...
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  • Troubleshooting Trailer Wiring Install for 2020 Toyota Highlander that is Not Active
  • Sounds like you should have went with the Tekonsha trailer wiring harness part # TK99FR which comes with the harness of the # TK74FR but also comes with the needed converter box harness which you are missing. The converter harness is also not available separately.
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  • How To Find the Trailer Fuses and Relays On a 2006 Toyota Highlander Hybrid
  • If you have a factory plug on your 2006 Toyota Highlander then these circuits will be protected by fuses and relays built into the factory fuse box located under your hood. In order to be sure you are looking in the correct locations you will need to either look in your owner's manual for these locations or there will be a diagram printed on the underside of the fuse box lid with this information for you. If you do not already have the trailer connector portion of the harness then I recommend...
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  • Trailer Right Brake/Turn Light Not Working Using Trailer Wiring Harness on 2006 Toyota Highlander
  • The most likely case is that the box has kicked the bucket and will need to be replaced. Since you are not getting power to the right turn/brake pin on the 4-Way, test the corresponding wire on the input side leading into the converter. If there is no power there either than you will want to check the turn signal fuse or relay for the vehicle. Find it using the owners manual. You can also trying moving the ground wire to a different location. If the issue occurred because of a short...
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  • Troubleshooting Brake Override and Stop/Start Malfunction On 2022 Toyota Highlander Redarc Tow Pro
  • It sounds like when the Redarc Tow-Pro Elite Brake Controller # RED44FR was installed on your 2022 Toyota Highlander that they may have damaged the brake signal wire or tied into the wrong wire. I recommend taking it either back to the shop who installed the brake controller or your local Toyota dealer to have the wire checked and fixed or moved to the correct connector. If you are concerned with the wiring and 7-way they installed the Tekonsha OEM Replacement Vehicle Wiring Harness w...
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  • Troubleshooting Trailer Harness On 2004 Toyota Highlander
  • If the lights are not working on your trailer and you are unable to find any current at the vehicle side connector it sounds like you may have a blown fuse. Per the installation instructions for the T-One Vehicle Wiring Harness for Factory Tow Package, part # 118248, you will need to find the towing fuse and insert the included 10-amp fuse. Look in the engine compartment for the fuse. From my research I found that the towing fuse is in position 11. Check the fuse to make sure it is good...
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  • Poor Ground Connection Causing Both Trailer Turn Signals to Blink
  • The symptoms you mention are typically caused by a poor ground connection, either at the trailer connector on the vehicle, the connector on the trailer or at one of the trailer lamp's grounding points. Make sure that the ground wire of the Tekonsha # 118791 is securely attached to the vehicle frame or chassis. I like to place a star washer between the vehicle surface and the ring terminal, the washer will bite into the metal for a secure, reliable connection. The same goes for the main...
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  • Trailer Lights Stopped Working Using Trailer Wiring Harness 118449 on a 2009 Toyota Highlander
  • The first thing I would check is the small fuse that is part of the converter box wiring for harness # 118449. If that fuse is loose or blown the whole harness will not work. And if it is blown it is possible that a short on the trailer caused it to blow and until that short is found and fixed it would just keep happening. If the fuse is not blown then the converter box itself could have blown and the harness would not work. You would need to replace the wiring harness. You can also check...
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  • Troubleshooting Holes Not Aligning on Trailer with Ultimate Jack Trailer Jack
  • The # 322-RDJ-2K Ultimate Trailer Jack can be rotated in any direction as long as one of the holes is facing forward. So rotating the jack will not be a problem. As for aligning the holes, I would not recommend modifying the jack in any way, since that can void its warranty. If you are having trouble mounting the jack to the trailer I recommend changing the mounting holes in the trailer so they match the holes on the jack. I have attached a video review for your reference.
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  • Is it Normal to Have Noise from Trailer Weight Distribution/Sway Control System
  • Trailer weight distribution/sway control systems like Curt # C17062, which uses the friction bar type anti-sway, and even the integrated anti-sway systems built into other weight distribution systems like the Equal-I-zer # EQ37120ET will generate some noise. Since they use friction to control/prevent sway some noise is inevitable, even when everything is set up correctly. Depending on the particular system and driving conditions this noise can be enough for you to hear it in the vehicle....
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  • Curt 56042 4-Pole Trailer Connector Installed on 2017 Toyota Highlander and it Doesn't Work
  • The T-connector trailer wiring harness for the 2017 Toyota Highlander consists of two different parts, the connector itself which is part # 56042 you purchased as well as a converter box that completes the tow package. The # 56042 is actually intended to replace a damaged trailer connector on vehicles already equipped with the tow package wiring. Therefore, if the # 56042 is installed on a vehicle that does not have the tow package, the trailer wiring would be incomplete and wouldn't...
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  • After Installing Trailer Wiring Harness on a 2006 Toyota Highlander Sport Trailer Lights Do Not Work
  • There are some things you can do to determine if the issue is on the harness, # 118413, or somewhere else. First, make sure that the harness is grounded to a clean metal surface. There cannot be any paint where the harness is grounded. Also, if you are using a factory grounding point that is already occupied by 1 or more items then I recommend moving the harness ground elsewhere. Next you will want to test the wires going into the black converter box and the wires coming out. Use a circuit...
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