Thank again Nodge I shall take this info;
The factory values are on the left. My Sony is in brackets.
Volume down 0 Ohms (24 K Ohm)
Volume up 390 Ohms (16 K Ohm)
Search up. 860 Ohms (8 K Ohm)
Search down 1680 Ohms. (11.25 K Ohm)
To an auto electrician.
 
Thank again Nodge I shall take this info;
The factory values are on the left. My Sony is in brackets.
Volume down 0 Ohms (24 K Ohm)
Volume up 390 Ohms (16 K Ohm)
Search up. 860 Ohms (8 K Ohm)
Search down 1680 Ohms. (11.25 K Ohm)
To an auto electrician.

The resistors in the actual wheel switches need changing. I've looked at many options, but this approach is the easiest. I've yet to do it to mine, but it's on the "to do" list.
 

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