[Bonus]

SONY Models CDX-M500R , CDX-M600R , CDX-M700R, maybe CDX-M800R

Code Off Solution


The easy way to solve these old radios is to remove the code, especially when the remote control unit RM-X96 is lost.

This is done by just soldering the three links so they are all shorted, as shown in the picture below.


CDX-M700R



I you do have the remote control the remote key sequence is as follows:-

(where '0' represents an open circuit and '1' represents a short/closed circuit.)

0 000 N/A
1 001 Disc > Source > List > Open/Close
2 010 Off > Source > Alt > Open/Close
3 011 Sound > Mode > Alt > Open/Close
4 100 N/A
5 101 Menu > Enter > Mode > Open/Close
6 110 Seek > Seek + > Mode > Open/Close
7 111 Code disabled