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Important Please give copies to Technical Bulletin all your Audi Technicians Subject Multi Media Interface MMI , Audio, and Battery Group 91 Concerns Number 05 09 Model s A8, A8L 2004 2005 Date Jun. 16, 2005 A6 2005 Supersedes T.B. Group 91 number 05 03 dated Mar. 24, 2005 due to additional information. Condition At ambient temperatures below 40 F, processor failure in the radio can cause any one of the conditions listed below. Another symptom of radio processor failure is waking up of the Media Orientated Systems Transport MOST / Can Bus system. This symptom will eventually deplete main battery voltage. 1 MMI is slow to respond. 2 “Radio Not Installed” is displayed in the MMI screen. 3 Poor radio reception. 4 Engine will not start. Service Obtain radio Part No. black arrow and EC No. white arrows from radio located in trunk and compare to table below. Part No Model Software Level 4F0 035 541 A6 EC 109 4F0 035 541X 4F0 035 541B A6 EC 101 4F0 035 541BX 4E0 035 541B 91 A530 4E0 035 541BX A8/A8L EC 125 4E0 035 541E A8/A8L EC 102 4E0 035 541EX C 91 05 09 1 of 3 2005 Audi of America, Inc. . Information contained in this document is based on the latest information available at the time of printing and is subject to the and other intellectual property rights of Audi of America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any time without notice. No part of this document may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, nor may these materials be modified or reposted to other sites, without the prior expressed written permission of the publisher. Important Please give copies to Technical Bulletin all your Audi Technicians If EC Software level is below levels indicated for Model and Part No. in table, perform the following For condit