Expert Answers about Lexus RX 300

• Troubleshooting Trailer Left Turn Signal Not Functioning on a Trailer Towed by a 2001 Lexus RX300
• My first instinct would be to check the vehicle side trailer connector. Any dirt and/or corrosion can cause the harness to function improperly. Give it a good cleaning with a wire brush to clean out and off any corrosion. If you are still experiencing a problem after cleaning the pins, you will want to check them for the proper functions using a circuit tester like part # PTW2993. If the functions are all correct and working properly then there could be a problem with the trailer wiring,...
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• Troubleshooting Blown Tail Light Fuses with a Non-Powered Tail Light Harness on a 1999 Lexus RX300
• Sounds like your trailer is overdrawing your tail light circuits and that is why the fuses are getting blown. Having a powered unit does make a big difference for this issue. A powered unit will basically only use the tail light wiring as signal wires and then draws all the power for the trailer tail lights directly from the battery. This protects the delicate tail light wiring and prevents problems like what you are experiencing. I think your best option at this point would be to install...
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• Troubleshooting 4-Pole Wiring Harness on 2003 Lexus RX300
• Tekonsha 4-pole wiring kit # 118245 is the correct OEM replacement harness for the 2003 Lexus RX300 with factory tow package. If you checked the fuse and tested the pins on the 4-pole plug and have no power on any of the 3 circuits I suggest you unplug the harness and test the OEM connector on the vehicle where this part plugs in. If you have signals there, upstream of the 4-pole harness, then the harness may be bad. If you do not have signals there then there may be an issue within the...
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• Troubleshooting Wiring Harness Install on 2003 Lexus RX 300
• The T-One Vehicle Wiring Harness for Factory Tow Package # 118245 is a plug-in for a 2003 Lexus RX 300 and would only require you to place a 20 amp fuse like shown in the accompanying photo and linked video to the install of this part on an '03 RX 300. Uninstall the connector and see if the light on the dash goes off. If so, try re-installing it by following the same steps as in the video. If the light remains on I recommend having your vehicle looked at by a mechanic to determine the issue...
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