What is the reason that the high beam cannot be turned on but can flash?
2 Answers
Causes and solutions for the high beam not turning on but flashing are as follows: 1. High beam fuse damage: Solution: It is recommended to first check the high beam fuse, then measure the input and output signals of the high beam switch and replace it in time. 2. High beam relay issue. Solution: For contacts made of different materials, different material processes should be used. Some contact materials with higher hardness should be annealed before contact manufacturing, riveting, or spot welding. 3. Fault in the main plug of the high beam: Solution: It is recommended to first check the high beam fuse, then measure the input and output signals of the high beam switch. If there is an input signal but no output signal, it indicates that the high beam switch is damaged and needs to be replaced. If there is no output, the relevant wiring should be checked.
I've encountered this situation before, and the core issue is a partial failure in the high-low beam switching component. The lever on the left side of the car's steering wheel controls the lights. When you push the lever to activate the high beams, it essentially drives the relay to engage. If the contacts are worn out, they can only respond to instantaneous current—brief operation during flashing triggers the electromagnetic effect, but the contact piece cannot maintain a closed state during continuous power supply. You'll need to disassemble the lever assembly to check if the metal spring piece is deformed, or directly replace the entire lighting control module. Using high beams less frequently on bumpy roads can extend the lever's lifespan. Remember to check if the combination switch connector is loose, as moisture infiltration can also cause intermittent failures.
