Audio System - Buzz/Hum/Hiss From Speakers
91 08 42
2018701/1
September 15, 2008
Vehicle Information
Radio reception and playback problems
Condition
The customer may report constant sound interference in the radio. The sound may be distorted, or a humming or hissing noise may be audible in all
speakers.
Technical Background
If the reception level is good, the problem may be caused by aftermarket equipment that is plugged into the cigarette lighter or one of the power
outlets. Insufficient radio interference suppression of rechargers and power supply units of mobile telephones, navigation systems and other
electronic devices may cause voltage interference in the on-board network.
Audi A4 Quattro Sedan (8K2) L4-2.0L Turbo (CAEB) Page 478
Production Solution
Not applicable.
Service
1. Verify if aftermarket devices were installed in the vehicle.
2. Disconnect the aftermarket devices, if applicable.
3. Inform the customer if the interference disappears after removal of a plugged-in aftermarket device.
Warranty
This TSB is informational only and not applicable to any Audi warranty.
Additional Information
All parts and service references provided in this TSB are subject to change and/or removal. Always check with your Parts Department and service
