Thought I could add a few suggestions for anyone else experiencing this issue.
1.The SLIDER AT THE TOP OF THE REMOTE MUST be in the DVD Position. The sequence will not work if remote slider is in Disc explorer mode or TV mode. It doesn't specify this in the service manual either.
2. Sometimes it just doesn't work the first couple times, so keep trying. For best results, do the sequence from about 5 feet away, pointing the remote at the receiver on the player (lower left), and slowly and firmly press each button, pausing 1/2 to 1 second between each button press works best for me.
3. Also, it could just be low batteries in the remote and If it still doesn't work and it is worth putting more $$ into try a new remote as suggested already.
Just my 2 cents probably worth noting for future visitors to this question.
4. + LINK to FULL FREE Service Manual
SONY DVP CX995V SM Service Manual free download schematics eeprom repair...
NOTE: at the link above Click the Get Manual
under the preview to download