A941565 2012749-

Technical Service Bulletin
94 Exterior lights, moisture accumulation
94 15 65 2012749/12 April 17, 2015. Supersedes Technical Service Bulletin Group 94 number 12-92 dated
October 24, 2012 for reasons listed below.
Model(s)
Year
VIN Range
Vehicle-Specific Equipment
All
1996 - 2016
All
Not Applicable
Condition
REVISION HISTORY
Revision
Date
Purpose
12
-
Revised header data (Added model years)
11
10/24/2012
Revised Service (Added Q7 specific TSB)
10
9/18/2012
Revised header data (Added new A6)
Condensation is visible on the inside of the headlight, taillight, fog light, side marker light, front turn signal, daytime
running lights, or third brake light lens.
Technical Background
The headlight circulation system allows air from the outside to flow through the headlights. This open waterprotected ventilation system (which is needed for pressure compensation) creates different climate zones in the
headlight: very warm areas, where the lens is warmed up by the light, and relatively cool areas, where the lens is
cooled down by the airflow.
Considerable differences in humidity and temperature between the inside and the outside of the headlights, even
when the car is being driven, can create condensation. While condensation is most common in cold and wet
weather, it can also occur after a car wash, after the engine or front end has been steam-cleaned, or when the
temperature changes. Condensation is more visible on lenses made of clear glass than on lenses with patterns.
The moisture does not affect the headlight function or light performance, and it does not lead to corrosion or
damage of other headlight parts.
Production Solution
Not applicable.
© 2015 Audi of America, Inc.
Page 1 of 2
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 Service Bulletin
Service
For headlights, the affected lens surface should be clear after approximately 10 minutes of light operation,
although the entire lens surface may not clear. The clearing process depends on the outside temperature and the
humidity.
• When water droplets have formed on the inside of the lens or water has collected at the bottom of the light
assembly, check for leaking seals and/or cracks in the lens or light assembly. If no damage is found, use
compressed air (less than 30 PSI) to clear the lens.
• On light assemblies with LED lights (such as S6 daytime running lights) the LED lights do not emit enough heat
to clear the moisture from the lens. Only the pressure difference of the ventilation system provides the air flow
to clear the moisture on the inside of the lens. The design of the ventilation system on these types of lights will
ensure the lens is clear after a few miles have been driven.
• For Audi Q7, refer to TSB 2028277, 94 Moisture accumulation in headlamps, for the installation of headlight
ventilation valves.
Do not replace light or lens assemblies for these conditions.
Warranty
This TSB is informational only and not applicable to any Audi warranty.
Additional Information
All part and service references provided in this TSB (2012749) are subject to change and/or removal. Always
check with your Parts Dept. and service manuals for the latest information.
© 2015 Audi of America, Inc.
Page 2 of 2
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.