You will have to remove the steering wheel to replace the illumination bulbs. To do so you will need a Torx T-30 and a 10mm allen on a big ratchet. After removing the air bag carefully remove the small red connector on the back of the bag then place the bag on a clean surface with the Airbag facing up. Get out the 10mm allen and remove the big cone shaped bolt in the center of the wheel and mark the wheel before removal. The wheel will go on many many ways mark it well. Pull out the cluster with some Mercedes dash hooks and there you go.
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