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Technical Service Bulletin

90 Horn sound quality poor

United States 444 Volkswagen of America, Inc. (6444)

[Status | Released for publishing

Release date Aug 15, 2025

New customer code

Object of complaint Complaint type [Position|
lighting, signaling -> acoustic signals -> horns noises, vibrations -> distorted sound | |
lighting, signaling -> operation, activation, light regulation -> horn contamination -> dirty | |
operation

lighting, signaling -> operation, activation, light regulation -> horn |component, automotive fluids ->

operation damaged

lighting, signaling -> operation, activation, light regulation -> horn . ae .

operation noises, vibrations -> noise

lighting, signaling -> acoustic signals -> horns functionality -> no function [|
lighting, signaling -> acoustic signals -> horns noises, vibrations ->noise |_|
lighting, signaling -> acoustic signals -> horns noises, vibrations -> too quiet [|
New workshop code

Object of complaint Complaint type |Position|

lighting, signaling -> signal system -> dual tone horn | noises, vibrations -> distorted sound | |

Vehicle data

Sales types

fp fonfa fT

aoja fT

aowsfa ff

aoa |

pj jaorsfa |

aoa |

aoa |

[jaorwfa [|

[fafa |
[fafa |
[faotfa |
[_faofa |
[faosfa |
[fafa fo
|; faosfa fo
[fase |
Documents

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Technical Service Bulletin Transaction No.: 2074436/2
90 Horn sound quality poor Release date: Aug 15, 2025
Condition

REVISION HISTORY

revision [bate frupose

2 - | Revised header (Add Model Years)

06/28/2024 | Initial publication

Customer states:

+ The horn sounds distorted.

OR

+ The horn is too quiet.

OR

+ The horn sounds distorted but returns to normal after using it a few times.

Technical Background

Massive water ingress into the horn (steam jet pointed directly at it) impairs the function of the horn’s membrane.
Production Solution

Not applicable.

Service
The horn must be connected to the bracket and must not touch other components.

If the horn is touching other components, create clearance first and then check its function.
Try to remove any water from the horn by operating it several times (approx. three times for 5 seconds).

If the complaint persists after this check, remove the affected horn from the bracket.
Then turn the horn so that the opening of the horn funnel (see red mark on illustration) points to the floor and the
water can drain.

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a Pie
- 7. .
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P : eo
Figure 1. “Horn opening’.
Shaking the horn slightly helps the water to drain quickly.
Do not open/disassemble the horn to dry it, as doing so may damage the seals and cause water to enter the
electronics.
Over time, this will cause the horn to fail.
After the water has been removed from the horn, it must be refitted on the bracket.
Operate the horn for approx. 5 seconds three times in a row.
Wait approximately half an hour and press the horn again.
If the complaint persists, replace the affected horn.
Warranty
Claim Type: + Ifthe vehicle is outside of any warranty, this Technical Service Bulletin is
informational only.
Damage Code: 0033
Labor Operations: Remove and install horn 9050 19xx See SRT with
associated
operations
Remove and install 2 horns 9050 20xx | See SRT with
associated
operations
Clean 2 horns 9050 3099 | 20 TU
Claim Comment: As per TSB 2074436/2
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