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Why does my Audi A3 buzzer not come on when lights left on?

Headlight warning buzzer not operational or doesn't sound:

- Buzzer connector on central electric harness is not plugged in.

- Buzzer connector at light switch is not plugged in.

- Door contact switch(es) defective or not adjusted correctly.

- Buzzer malfunctioning.

- Bulb failure warning unit.

- Door closed position not being transmitted.

- Central electrics harness is open.

- Fuse defective.

- Circuit 29 has an open.