What are the reasons for the Highlander's daytime running lights not working?
3 Answers
The reasons for the Highlander's daytime running lights not working are: 1. The daytime running lights are turned off in the vehicle settings; 2. The fuse for the daytime running lights is blown; 3. There is a fault in the wiring harness; 4. The driver connector is loose or poorly connected. The Highlander is a GAC brand model with body dimensions of: length 4890 mm, width 1925 mm, height 1720 mm, wheelbase of 2790 mm, fuel tank capacity of 72.5 liters, and curb weight of 1910 kg. The Highlander is equipped with a 2.0T turbocharged engine with a maximum power of 162 kW and a maximum power speed of 5200 to 5600 rpm. It uses MacPherson independent suspension at the front and E-type multi-link independent suspension at the rear.
I've been driving a Highlander for several years and often encounter issues with the daytime running lights not working. The most common problem is a burnt-out bulb, especially in older vehicles where the filament ages and breaks. Blown fuses are also frequent, and you can usually find the issue in the fuse box under the hood. Wiring problems, such as loose or corroded connections causing poor contact, are common since the Highlander's wiring harness is prone to damage in humid environments. Control module failures are not uncommon either—the daytime running lights are managed by the vehicle's computer, and sensor malfunctions or software bugs can cause the lights to stop working. I recommend checking the simpler components first, like bulbs and fuses. If that doesn't solve the issue, take it to a dealership for professional diagnostics. Don't delay too long, as it affects daytime driving safety.
Driving the Highlander to and from work, I noticed the daytime running lights weren't working, which is quite concerning. Especially on cloudy days, the car can be easily overlooked without these lights. It might be that the bulb's lifespan has naturally ended after prolonged use, causing it to stop working. The fuse could have blown to protect the circuit from overload. Short circuits or broken wires are common in areas with frequent vibrations, and the wiring near the Highlander's rear wheels tends to loosen. Additionally, faulty control sensors, like the sunlight sensor, can also cause the lights not to work. These issues have been discussed in my car enthusiast group, and the solution is often to start by replacing the bulb or fuse—it's cheap and quick. Safety comes first; fix any problems immediately to avoid risks.
