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.