A9421392063739_1

94 Headlights may not turn off during daylight hours
94 21 39 2063739/1 June 23, 2021.
Model(s)
Year
VIN Range
Vehicle-Specific Equipment
All
2018 - 2022
All
Not Applicable
Condition
When the light switch is in the “AUTO” position, the headlights are switched off later than expected or not at all
during daylight.
Technical Background
When the sun is low in the sky (particularly during winter) and especially if the sun is also behind the vehicle
(Figure 1), it is possible that the light sensor is within the vehicle’s shadow (Figure 2).
Figure 1. Sun trajectory in relation to the vehicle’s sensor.
In such cases, the sensor detects a lower ambient
brightness than perceived by the driver. In this case
it is possible that the headlights are not switched off
as expected.
Figure 2. Close-up of the sensor’s location.
Page 1 of 2
© 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.
In addition to this, when the sky is clear/blue there is no cloud cover to reflect the sun’s radiation back; this
leads to a lower infrared value being measured at the sensor and intensifies the scenario described.
Production Solution
Not applicable.
Service
Note:
The only possible way to minimize the occurrence of this situation which complies with legal requirements is to
change the switch-on point of the headlights to “late” in the MMI settings.
Warranty
This TSB is informational only and not applicable to any Audi Warranty.
Additional Information
All part and service references provided in this TSB (2063739) 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 2 of 2
© 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.