2017 Mercedes Benz S 63 AMG Technical Service Bulletin # 2009090005 Date: 091001

Campaign - Horn May Not Actuate When Depressed
FILE:
SERVICE: GROUP 00 OF SERVICE INFORMATION BINDER
PARTS: GROUP I OF INFORMATION _ PARTS & ACCESSORIES BINDER
Campaign No. 2009090005, October 2009
TO: ALL MERCEDES-BENZ CENTERS
SUBJECT: Model 221, Model Year 2010
Check Horn Contact, Repair if Necessary
This Service Campaign has been initiated because Daimler AG (DAG), the manufacturer of Mercedes-Benz vehicles, has determined that the
steering wheel may not have been produced to specification. As a result the horn may not actuate at all corners of the horn pad. Dealers will check
for proper horn actuation and rework, if necessary, at the next workshop visit.
Prior to performing this Service Campaign:
^ Please check VMI to determine if the vehicle is involved in the Campaign and if it has been previously repaired.
^ Please review the entire Service Campaign bulletin and follow the repair procedure exactly as described.
Please note that Recall and Service Campaigns do not expire and may also be performed on a vehicle with a vehicle status indicator.
Approximately 40 vehicles are affected.
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Procedure

1. Switch ignition: ON.


2. Actuate the horn by pressing on the air bag unit alternately on the outer left/right and top/bottom:

Note:
^ The horn must be triggered when actuated on all sides and the force required on both sides must be comparable
^ If horn IS actuated (horn sounds) procedure is complete.
^ If horn is NOT actuated (does NOT sound) continue with this procedure.
3. Switch ignition: OFF, disconnect battery then remove air bag unit from steering wheel; refer to WIS: AR91.60-P-0660SX.
Note (regarding above WIS instructions):
^ Do not disconnect air bag harness connector from air bag unit.

1. Affix 4 pieces of felt tape to steering wheel (arrows, Figure 1).


2. Affix 1 washer on each side of steering wheel (A, Figure 1) using only recommended 2- part adhesive (refer to parts table).

Note:
^ Mix 2-part adhesive together prior to applying to steering wheel (e.g., mix adhesive on a piece of cardboard etc.). Dispensing gun (special tool) is
required to squeeze adhesive out of tube
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^ Refer to Figure 2 for view of installed felt tape (A, Figure 2) and applied adhesive (B, Figure 2).
^ Refer to Figure 3 for view of installed washers (A, Figure 3).

1. Reinstall air bag unit to steering wheel in reverse order and reconnect battery.


2. Repeat test procedure described in step 2: If horn does not actuate (sound), affix 1 additional washer on affected side of steering wheel using

recommended adhesive.
Note:
Do not affix more then 2 washers on each side of steering wheel
8. Reassemble in reverse order (refer to WIS: AR91.60-P-0660SX).
Note (regarding above WIS instructions):
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^ It is not necessary to read out/erase fault memory.
Special Tools
Parts Information
NOTE:
^ Please be aware that only the part number(s) referenced in the Campaign Bulletin is/are approved for use to repair the vehicle. Repairs performed
using any other part(s) will not have been performed in accordance with the campaign. Accordingly, warranty claims submitted with reference to
an improper part number(s) will be denied.
^ The following allowable labor operation should be used when submitting a warranty claim for this repair.
Warranty Information