What are the reasons for the left and right brake lights of the new Audi Q5L not working?
3 Answers
Here are the specific reasons why the left and right brake lights of the new Audi Q5L may not be working: Reasons for brake lights not working: Brake light filament burned out, bulb damaged; Brake light switch malfunction, unable to control the brake lights; Poor grounding of the brake light. Inspection methods: First, remove the brake light bulb to check if the filament is burned out; If the bulb is intact, press the brake pedal and measure whether there is power at the live wire terminal of the brake light bulb. If there is power, it indicates poor grounding of the brake light; If there is no power, check the brake light switch and wiring. Short-circuit the brake light switch terminals. If the brake light turns on, it means the brake light switch is faulty and should be replaced; If it does not turn on, it indicates an open circuit in the wiring, and the break point should be located and repaired.
I've been driving the Audi Q5L for a while and encountered an issue where both brake lights aren't working. My first thought was that a fuse might have blown. In new cars, the fuse box is usually located on the dashboard or the right side of the trunk, and the manual has diagrams for reference. The brake light switch is a common culprit—when you press the brake, the contacts might not work due to oxidation or wear, causing both sides to fail. A short circuit in the wiring could also be to blame, possibly due to damage to the main wiring harness triggering the issue. For safety reasons, driving at night poses a high risk, so don’t hesitate to take it to a professional shop for repairs. Experience tells me that quick action can prevent rear-end collisions. I remember a similar situation last time—the dealership replaced the switch, and that fixed it. It’s also a good idea to check if the vehicle’s voltage is stable to prevent a repeat of the problem.
I just drove my newly purchased Q5L when suddenly the brake lights on both sides stopped working, which made me quite nervous. A friend suggested I first check the fuse, so I opened the fuse box under the glove compartment to see if it had blown. If the fuse is intact, it might be a faulty brake switch located behind the pedal—try pressing it a few times to see if it responds. New cars have complex electronic systems, so it's best not to tamper with them randomly; safety comes first. Missing brake lights can cause misjudgment by vehicles behind you, leading to accidents. I think beginners should rely on the manual or an app for step-by-step guidance, or take advantage of the warranty period to have the dealership inspect the wiring and controller. Don’t delay. While it’s good to learn basic car knowledge while driving, ensuring travel safety should always be the priority.
