Join Date: Apr 2018
Vehicle: 2003 SLK200
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I had exactly the same issue - had burnt through 3 clock springs over a period of years, (2 since January) - I took it in to a local garage who specializes in car electrics.
They traced it to a short on the break light switch - one of the cables was shorting out against the steering column causing the clock spring to burn out- from memory, it was on a wiring loom and they had to strip the steering column down.
No error codes showed up either and no fuses were blown.
The fuse box chart doesnt help - the fuse for this is in the compartment beside the battery on my R170- guess it will be slightly different on your car.
Hope this helps