On my SD and also on my Land Rover I can insert the key and get the steering wheel to unlock by moving the steering wheel to the right and left several times. Maybe yours works that way too? Kinda jimmy it back and forth several times and you can feel it unlock.

I tried that, it did not work

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2005 C320 4-Matic
85 300TD wagon with the third seat; I am slowly restoring it.
99 E300 TD

Thanks! But when the key is turned the steering wheel is completely free to turn any direction however much I want.

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2005 C320 4-Matic
85 300TD wagon with the third seat; I am slowly restoring it.
99 E300 TD

Do you know where that is located on the car?

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2005 C320 4-Matic
85 300TD wagon with the third seat; I am slowly restoring it.
99 E300 TD

Did you do the power test I suggested way back in post 2 ?

Not yet; bad weather and I've been ill. But I will do this, and let you know what I find.

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2005 C320 4-Matic
85 300TD wagon with the third seat; I am slowly restoring it.
99 E300 TD