A4 Quattro Sedan L4-2.0L Turbo (CAEB) (2009)
Amplifier: All Technical Service Bulletins
Audio System - No Audio From Any Sources
91 CAN radio with Bang and Olufsen sound system, no audio
91 10 13
2023281/1
April 23, 2010
Affected Vehicles
Condition
^ The customer complaint is that there is no sound from all sources.
^ Only Concert/Symphony III CAN radios (PR 8UQ/8YN) with Bang and Olufsen Premium Sound system (PR 9VK) are affected.
^ In the Amplifier J525 (address word 47), DTC 00003 (Control Module Faulty) is stored.
Technical Background
In certain rare circumstances (e.g. discharged vehicle battery, engine off, radio playing at high volume and/or bass levels) it is possible for battery
voltage at the amplifier to briefly drop below 9 Volts. When this occurs, the amplifier software temporarily switches the amplifier off. If the condition
occurs 3 times, DTC 00003 is stored and the amplifier is permanently switched off.
Production Solution
Optimized amplifier software.
Service
1. Follow all instructions in the attached TSB 2011732 00 Software Version Management (SVM), operating instructions.
2. Update the amplifier J525 using the SVM action code as listed in the table above if necessary. This update will delete the DTC entry in the amplifier
and the sound will again be available.