Sony PCV-R532DS - Manual (Page 77)

System Board 69
AUX-IN Connector
The AUX-IN connector on the system board is a 1 x 4-pin header
connector that is not in use.
AUX-IN
Pin Signal Name
1 Left Line In
2 Ground
3 Ground
4 Right Line In
KY0062B.VSD
AUX-IN
1
4