Why does the Passat Lingyu not respond when starting despite having battery power?

[Harold]

If the Passat Lingyu does not respond when starting, check the starter's fuse and relay. It could also be caused by poor contact in the starter's solenoid coil. Precautions for car batteries: Avoid parking the car in open parking lots for extended periods. The car engine is harder to start in winter. Each attempt to start the car should not exceed 5 seconds, and the interval between attempts should be no less than 15 seconds. Car batteries need to be charged regularly. If left unused for a long time, the battery will slowly discharge on its own. Clean the battery terminals periodically. Avoid using car electronics after the engine is turned off. Running the battery alone without the engine generating power can damage it. Function of relays: Car relays primarily function to control high current with low current. The car control module cannot directly power the actuators, as this could easily burn out the computer board. Therefore, the car control module powers the relay coil to control the actuators.