A9019232054197_2

90 Audi adaptive light, pre sense, and/or driver assistance systems are not working at start-up, DTC
C12D5FA stored
90 19 23 2054197/2 August 14, 2019. Supersedes Technical Service Bulletin Group 90 number 19-08 dated
March 5, 2019 for reasons listed below.
Model(s)
Year
VIN Range
Vehicle-Specific Equipment
A6, A7, A8,
Q8, and
Audi e-tron
quattro
2019 - 2020
All
Not Applicable
Condition
REVISION HISTORY
Revision
Date
Purpose
2
-
Revised header (Added Audi e-tron quattro and MY20)
Revised Condition (Added statement that other sporadic DTCs may also be
present)
1
03/05/2019
Initial publication
Customer states:
 There is a failure of the driver assist systems or a respective message in the instrument cluster briefly after
starting the vehicle, e.g.:
 Audi adaptive light.
 Audi pre sense system error.
 Adaptive vehicle assistance is restricted.
 Adaptive vehicle assistance predictive regulation is currently restricted.
After a few seconds, the messages in the instrument cluster disappear and the systems are available again.
Workshop findings:
The following DTC may be sporadically stored in the control module for driver assist systems, J1121 (address
word 00A5):
 DTC C12D5FA (control unit of driver assist systems for picture processing does not respond) with symptom
code 221281.
 Other sporadic DTCs may be present in combination with C12D5FA.
The Guided Fault Finding recommends the replacement of the control module for driver assist systems, J1121
(address word 00A5).
Page 1 of 2
© 2019 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.
Technical Background
The DTC C12D5FA (control module for driver assist systems for picture processing does not respond) with
symptom number 221281 can occur during the start-up phase of the control module for driver assist systems.
After a few seconds, the control module for driver assist systems automatically restarts. Then it works correctly
and the messages in the instrument cluster disappear.
Production Solution
Not applicable.
Service
1. Delete the DTC C12D5FA.
2. Instruct the customer that the concern can reoccur after start-up under specific conditions. Because the
control module for driver assistance automatically reboots, the functions are fully restored after a short time.
3. A replacement of the control module for the driver assist systems, J1121 (address word 00A5) for this DTC
does not solve this issue. Claims for replaced parts will be subject to review.
4. If the concern does not occur immediately after start-up, continue with the analysis. We recommend to
narrow down the DTCs based on the timestamp of the DTC (standard ambient conditions) and the time of the
customer concern.
Warranty
This TSB is informational only and not applicable to any Audi Warranty.
Additional Information
All parts and service references provided in this TSB (2054197) 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.
©2019 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 2 of 2
© 2019 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.