Oh well it was worth a try!
Might be worth putting one of those lens cleaner discs in but Pioneer units usually mount the laser upside down so dirt doesn't cause such a problem.
I have the manual on cd rom outlining the key fob testing and diagnosis but the chances are it still wont work ( mine doesn't!)
If you need a copy PM me your address details.
Steve.
my fob does not work on my mk3 it worked for two days when i got it then played about so i put a new battery in and now nothing so i got a new fob as it was not a lexus fob and i can not program it in so i have giving up for now after all that locking and unlocking
matt