Programming New Sub Key

[Crystallattice]

Hi Guys,

Recently bought a 2004 Toyota with one master and one valet/sub key, both working.

Proceeded to buy two extra keys from eBay and tried coding them. After deleting all but one master from system, I struggled to program any of the other keys. Stripped dash to get to ECU and also transponder black box, removed wires and Battery and reassembled.

Mannaged to get sub key/valet key programmed as another master to test if things are working, it did so I earased all again and programmed eBay keys as masters. Both work, including original master.

Problem: I can't program valet key as sub again using eBay master, after various attempts I tried coding it as another master using ebay master and it worked. Why did it not want to program as sub?

Now I have 4 master keys, confirmed by the fact that the ebay key programmed the valet key (as a master for now). In my car the 5 ign lock-ON, 6 door open-close procedure worked to program master key, but 4 ign lock-ON, 5 door open-close did not for the life of me work to program sub/valet key.

What could be wrong?

PS. there were never any lights, beeps or anything else to confirm/deny any problem during any programming attempts, failed or successful