Originally Posted by
GraphiteGhost

Are you kidding? It takes NO TIME or much effort to substitute YOUR key for the 'turn key on' portion, to see if the other FOB (of the 8, remember to not use more than the max number) can be set to lock/unlock the car. The ONLY portion of the sequence is turning the key AFTER pressing the FOB button twice. I do not think the spare has to be the key that is 'turned' in the iggy. You MAY NOT have to have it in proximity of the key ring where the 'good' key is. Others have been able to use the FOB board just to lock/unlock the car.
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As far as I know the eight refers to eight separate chips each with it’s own code that the security system will remember if programmed to. If the code is not in memory then the key will not work even if the memory has less than eight codes in it, it will be treated as an alien key and the car will not start.
Red Dog had random purchased fobs open the doors and others did not succeed in having such fobs work at all. The fob keys did not start the car.