The battery is sufficiently charged when the charging current reading is

101208
Wheels/Tires - Steering Wheel Shimmy/Vibration
Steering wheel vibrations/shimmy when driving at highway speeds mostly between 60 - 75 MPH
Topic number: LI00.90-P-050323
Version: 2
Design group: 00.90 Chassis complaints, vibrations
Date: 12-08-2010
Validity: 221 S-Class (except 4MATIC)
Reason for change Model designation added and content revised/ Supersedes DTB P-B-33.15/24
Complaint:
Steering wheel vibrations/shimmy while driving straight ahead at highway speeds.
Cause:
Vibration might be caused by wheel/tire assembly which is not optimized in terms of balance/uniformity, torque strut bushing or in a rare cases by a
steering rack.
Remedy:
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Note:
Before performing any diagnostic procedures, confirm that the vehicle is fitted with approved Mercedes-Benz wheels and tires. Warranty
repairs/diagnostics may have the claim denied on vehicles which are fitted with aftermarket wheels/tires.
Out of round wheels which are damaged from road hazards must be replaced as necessary. For any wheel/tire assemblies which are match-mounted,
before and after print outs from the Hunter 97MB must be retained in the customer file.
Please refer to MB Warranty Policy and Procedures Manual for tire balance coverage.
Due to the fact that the complaint described above may be attributed to wheels/tires, the below instructions must be followed. Refer to WIS
documents in group 40 for any additional, related instructions and procedures.
1. Check wheels and tires for wear and / or damage. Check the tire inflation pressure and correct if necessary (see the air pressure information
sticker on the fuel filler flap - set the minimum pressure).
2. Drive the vehicle at a constant speed > 60 MPH at least 15 miles to ensure elimination of tire flatspots. Only then is it possible to evaluate the
vehicle subjectively!

1. Lift the vehicle to unload wheels immediately after completion of the test drive in order to prevent the formation of new flats pots.


2. Remove both wheels on the front axle to determine the actual condition (balance, lateral and radial runout).

Note:
Before balancing the wheels, it must be ensured that the wheel balancing machine satisfies the specified quality requirements and is properly
calibrated (reading accuracy, turnover test, etc.); see the manufacturer-specific operating instructions.
All wheels are matched at the factory (fine tuning). As a result, the new wheels with a mileage < 700 miles cannot exhibit any lateral/radial
runout.
5. If imbalance exists, this must be eliminated by means of dynamic rebalancing (aim to achieve zero imbalance). The balancing result must then be
confirmed by means of a static balance check, i.e. if the balancing result is > 7 grams, rebalancing must be performed. Rebalancing is performed
on the basis of the forces/lever arm lengths and their different effects (see attachment) by moving the inner balance weight max. 1 cm (forward or
back) in the circumferential direction.
6. In some situation radial/lateral runout might require optimization by "matching". The recommended and approved wheel balancing machine
manufacturers provide a menu-assisted program for this purpose. However, matching can also be achieved by implementing a simplified repair
method.
To do so, mark tire relative to the rim, remove tire off the rim and turn the tire by 180 degrees. The tire must then be inflated gradually until the
settling pressure is reached by applying a pressure of mm. 3.5 - 4.0 bar without a valve element in order to guarantee optimum seating of the tire.
Visually check the concentricity of the tire again; if not OK, turn the tire by 90 degrees again and perform balancing, after adjusting the inflation
pressure, in the way described in point 5.
7. The test drive for evaluating the vehicle should only be performed after the vehicle has been driven for 15 miles.
If the vehicle is OK, close the RO (use the 40221 20 specified damage code).

1. If the complaint persists, please continue with step 9.


2. Install hydro-mount bushings on torque struts (from 4MATIC vehicles - part number provided in parts table) as described in

AR33.15-P-0160-02SX (see attachment) - chassis alignment is not required. Use damage code 33122 38.
10. MY 2010 S-Class (except 4MATIC) vehicles with EHPS only and up to a VIN end number AA351230. In the situation when after performing
all above steps, and if there still is an issue with steering wheel vibration /shimmy as described in the original complaint, install a different
steering rack, part number A221 460 50 00.
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Note:
The steering rack might not be readily available and might require involvement of special procurement. Attach print outs of wheel balancing
values or Service Manager / Shop Foreman authorization when returning replaced parts to QEC. Otherwise, claims might be debited for
unjustified part replacements.