Expert Answers about BMW X3

• Trailer Lights on Rental Trailer Cut Out Once Vehicle Headlights are Switched On
• What you mention is a classic system of a ground problem. Everything works fine until the running light circuit is activated, at which point the trailer's taillights are drawing maximum amperage. If there's a ground problem, this is where it's going to show up. On the vehicle side, make sure the white ground wire is securely attached to clean metal on the vehicle frame or chassis, but the chances are that the ground problem is somewhere in the wiring on the trailer itself. The main ground...
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• Replacing Keys to Thule Cargo Box if Cylinder Lock Code is Rubbed Off
• If your cylinder lock code is unidentifiable, you would have to get a new lock cylinder, though this would only be possible if your current cylinder is unlocked. If it is, you would just need the Thule Universal Change Key # 853-1251 to remove the lock and replace it with the Replacement Cylinder # THLOCKN022 and Replacement Key # THKEYN022. These cylinders and keys also come in a quantity of two # TH450200. I've added a link to a video for you which displays how the replacement cylinders work.
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• No Trailer Running Lights On 2017 BMW X3 Using Curt Trailer Wiring Harness
• If you are not receiving power on the brown wire leading into the converter box then I would make sure that you have this wire spliced into the correct circuit which you can confirm using a circuit tester. Also, the tail lights that you will be splicing into are those located on the body of the vehicle, not the hatch as these lights can lose power while the hatch is open. It looks like you are using the Curt Circuit Protected Converter part # C56175 which Curt does not recommend for the...
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• Load Resistors to Fix Rapid Flashing LED Lights
• The LED taillights often have this hyperflashing issue. To solve it, you simply need to add a load resistor like # DI34ZR. You will need one resistor for each side and this kit comes with 2. This will draw more power from your system so you won't get that hyperflashing. I've attached a diagram on correctly installing these load resistors.
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• Troubleshooting Brake Light Bulb that Works Again After Being Removed and Reinstalled
• I am not sure if you are referring to the brake light on your 2011 BMW X3 or one on the trailer you might be towing but in either case since the problem goes away after you remove and re-insert the bulb it sounds like there may be either a loose wiring connection or potentially a corrosion issue within the bulb socket. Sometimes just handling the wiring/socket/bulb on a troublesome light will move it enough to reestablish the power input when the wire is loose. By the same token, removing...
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• Recommended Thule Square Bar Roof Rack For 2020 BMW X3 With Flush Rails
• I doubt that all 4 of your older Thule feet happened to fail at the same time. Since the square bars that you previously used with these feet are not holding and you can slide them back and forth, you may have installed them incorrectly or just simply did not tighten the feet all the way. If you still cannot get them to fit then you will need to install a new roof rack as those older parts are not confirmed to fit for your vehicle. For your 2020 BMW X3, Thule recommends going with Thule...
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• HyperFlash Troubleshooting for 2005 BMW X3 Towing Trailer with LED Lights
• German vehicles with factory wiring that do not want to work right with LED trailer lighting require the adapters # C57003 for a 7-way to 7-way or part # C35FR for 7-way to 4-way. These adapters have the diodes wired into them so you would not need to hardwire additional ones in. The issue is that German vehicles have sensors built into the taillight harnesses to detect when a bulb has burned out. Since LED trailer lights only put a very slight amount of draw on the taillight circuits...
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• Troubleshooting My T-One Vehicle Wiring Harness On My 2018 BMW X#
• There can be many reasons that your blinkers and your hazard lights are not working: your harness wires may not be connected securely, you may have plugs that are not seated together properly or making a good connection, you may require a fuse or a relay is blown or missing, or the ground may be insufficient. In order to troubleshoot your setup you will need a circuit tester. I recommend the Hook Probe Circuit Tester, part # PTW2993. There are four methods you will use to trouble shoot...
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