Sony Car Sterio CDX-M1000TF Code Entry Instructions :

Sony CDX-M1000 car radio Code Entry Instructions

When your car stereo is turned on the display will show[SECURITY CODE INPUT]followed by[0000] GGGGGGGGGGGGGGGGGGGG
Input the code to your Sony stereo using the remote control handset 
Press [+] on your stereo until you reach the first digit required then press [SEEK] to enter
Press [+] on your car radio 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 [+] on your stereo 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 car radio on.

Hear you can download The Manual.

Some Information for "Sony CDX-M 1000 TF" car stereo :

This stereo SONY CDX-M1000TF is easy to install, looks good and has a great sound. The TFT display is clear and there are some good graphics on there. It plays mp3 discs but does not have a mp3 jack to connect your ipod/mp3 player which these days is a downside. The only real negative is that the face doesn't come off.
It comes with a remote for people in the back to use or to change over when you're listening outside the automotive but other than that I can't see the point in it.
All in all a very good stereo ;)