A9021152064692_1

90 Head-up display is inoperative and/or the 12V battery is drained
90 21 15 2064692/1 October 6, 2021.
Model(s)
Year
VIN Range
Vehicle-Specific Equipment
A6, A6
allroad, A6
Avant, S6,
RS 6, RS 6
Avant, A7,
S7, RS 7,
A7 PHEV,
Q8, SQ8,
RS Q8, Audi
e-tron
quattro, and
Audi e-tron
sportback
2021 - 2022
All
Head-up display (HUD)
Q7, SQ7
2020 - 2022
All
Head-up display (HUD)
Condition
Customer states:
 The head-up display (HUD) does not turn on. The message “The selected system is currently unavailable” is
displayed periodically in the MIB display.
 The vehicle’s 12V battery might be drained.
Workshop findings:
 The test plan “0019 – Read data bus sleep inhibitor” indicates that the HUD prevents the vehicle’s databus
system from going to sleep.
The following DTC may be stored in the information electronics control module, J794 (address word 005F):
 DTC U131C00 (Head-up display control module on fiber optic MOST data bus no communication).
Technical Background
Not applicable.
Production Solution
The issue is under investigation. As soon as further information is known, this TSB will be updated.
Page 1 of 3
© 2021 Audi of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright 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.
Service
1. Please check the DTC memory in the information electronics control module, J794 (address word 005F) and
run the test plan “0019 – Read data bus sleep inhibitor” as described under workshop findings in order to
positively identify this TSB’s applicability.
Note:
This TSB only applies if the DTC is entered with a high frequency (>10 information electronics control
module, J794 (address word 005F) and the head-up display is logged as a sleep inhibitor.
2. The interim solution is to reset the HUD by removing power to it for approximately five minutes.
For the Audi Q7, Q8, Audi e-tron quattro, and Audi e-tron sportback:
 Remove fuse SF4.
For the Audi A6 and A7:
 Remove fuse SG4.
3. Do not replace any components.
Warranty
Claim Type:
 110 up to 48 Months/50,000 Miles.
 G10 for CPO Covered Vehicles – Verify Owner.
 If the vehicle is outside any warranty, this Technical Service Bulletin is informational
only.
Service Number:
9091
Damage Code:
0040
Labor Operations:
Repair control unit for head-up display
9091 4199
20 TU
Diagnostic Time:
GFF
0150 0000
Time stated on
the diagnostic
protocol (Max 30
TU)
Road test prior to the service procedure
No allowance
0 TU
Road test after the service procedure
No allowance
0 TU
Claim Comment:
As per TSB #2064692/1
Page 2 of 3
© 2021 Audi of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright 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.
All warranty claims submitted for payment must be in accordance with the Audi Warranty Policies and Procedures
Manual. Claims are subject to review or audit by Audi Warranty.
Additional Information
All part and service references provided in this TSB (2064692) are subject to change and/or removal. Always
check with your Parts Department and/or ETKA for the latest information and parts bulletins. Please check the
Repair Manual for fasteners, bolts, nuts, and screws that require replacement during the repair.
©2021 Audi of America, Inc. All rights reserved. The information contained in this document is based on the
latest information available at the time of printing and is subject to the copyright 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.
Page 3 of 3
© 2021 Audi of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright 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.