What's the issue with Alphard's modified headlights malfunctioning?
2 Answers
Most cases involve oxygen sensor faults (a small portion may be caused by fuel injector short circuits or open circuits to ground), meaning the oxygen content in the exhaust exceeds the control range of the vehicle's original ECU. In such cases, the ECU will trigger the malfunction indicator lamp as a warning. Unauthorized modification of vehicle parameters: Modifications such as altering wheels/tires, installing spoilers, changing lighting systems, or modifying exhaust pipes are considered illegal alterations. These must be restored to factory specifications to pass inspection, and offenders may face fines, license suspension, or other penalties. Legal basis: According to Article 97 of the Road Traffic Safety Law of the People's Republic of China: No organization or individual may assemble motor vehicles or alter the registered structure, construction, or characteristics of motor vehicles without authorization.
I just bought a Toyota Alphard and modified the headlights, but now they won't light up—what a headache. The issue might be due to poorly connected wires during the modification, causing loose contact points. I used LED lights with higher wattage than the factory ones, which can easily blow the fuse. After checking the manual, I learned that the Alphard's electrical system is quite sensitive, and incompatible aftermarket parts can trigger the protection mechanism. Later, I had a technician inspect it, and sure enough, it was an overload issue. My advice is to first try replacing the fuse—you can find it in the fuse box under the driver's seat. If that doesn't work, check if the connectors are oxidized or loose. Don't attempt to disassemble it yourself; modifications come with risks, and you might end up damaging the entire lighting system. It took me a few days and a few hundred dollars to fix it. Now, I make it a habit to test the lights before driving.
