Why is there no sound from the Audi A4 player?

[VanAniyah]

Audi A4 player has no sound for the following reasons: Cigarette lighter socket voltage issue: If the player has no sound, check the cigarette lighter socket to see if there is normal voltage output to the MP3 player. FM transmitter module issue: For the player's FM transmitter module, turn on the player and the radio, adjust the frequency to match, and listen carefully to see if there is significant noise from the radio. If there is a lot of noise, it indicates a fault in the FM transmitter module. MP3 module issue: For the player's MP3 module, if the player and radio are turned on and the radio does not emit noise or the sound is very quiet, it means the FM transmitter module is functioning properly, and the problem lies with the MP3 module.