The player wouldn't even know how to scan or analyze, or even that he ever knew he could, or know that he's a technomancer. Nor would he have any reason to suspect the presence of the implant.
I'd suggest using a whole lot of other plots first because he'd have to spend quite a lot of time to figure out who/what he is. If not, he just got a whole lot of free BP's.
Edit: I should probably point out that I'm kind of biased towards some Negative Qualities, Amnesia, especially the Full version, being one of the worst. IMO it's a quality that just can't be played, and if it is I don't see how any group of 'runners would want anyone with Amnesia in their group. Who knows how many bad stuff that'll get thrown their way because of that guy. Total Amnesia is a lot worse, not only can't they know who/what will come causing trouble, the guy is completely useless too!
"Can you hack?" "Dunno." "Shoot?" "I Dunno" "Wrestle?" "I can try, I guess." "Do any kind of magic?" "I... might... maybe not..." "Explosives?" "Might be... maybe I'd blow myself up." "Sneak" "Oh yeah, chances are the enemy will never see me... or they'll spot me a mile away, not sure really." "And you have no idea who you are, what you've done so far or what enemies you got?" "Not... exactly... nope, sorry, can't." "So for all we know, or you know, you might be a wanted fugitive terrorist hunted by half the world, a toxic shaman or a fraggin' bug spirit host?" "I guess so, but I really doubt I am though!" "Why the drek would we want anything to do with you? Are you even sure you're a shadowrunner?" "I... think so. Yeah... Almost sure I am... was... I think..." "Let's ditch this guy, this job is risky enough without all that dead weigh dragging us down."