Below are the instructions we hold for entering the code into your Sony CDX-M850 car radio.
We do not guarantee the accuracy of the information contained on these pages.

If you find our instructions are either incorrect or not available, please let us know, where possible we would appreciate if you could supply any instructions you found to work for your radio.

Code Entry Instructions

After switching on the set the display will show [ SECURITY CODE INPUT ]

Open the front panel by pressing the left hand button on the fascia.

The centre display will be showing [ CODE IN 0000 ]

Press [ + ] until you reach the first digit required then press [ SEEK ] to enter
Press [ + ] until you reach the second digit required then press [ SEEK ] to enter
Press [ + ] until you reach the third digit required then press [ SEEK ] to enter
Press [ + ] until you reach the fourth digit required then press [ SEEK ] to enter

The clock will be displayed once finished. Press the [ SOURCE ] key to switch the radio on.

Just some of our Google Reviews & Ratings

All reviews are left on Google by legitimate customers: Google Reviews - Direct Link

Billy Marshall

5mins start to finish,really helpful website and service worked perfectly

Janez Šimic

It works... thank you !!!

Pete Gibbons

Was a bit dubious as to whether this was going to be a waste of time but thought 'it's much cheaper than going to a garage' so took the plunge...and so glad I did! Works in moments and was spot on.

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Free Radio Code Entry Help for Sony CDX-M850 Radios.

Just some of our Google Reviews & Ratings