01 acura tl factory nav security code?

I was wondering how to get the anti-theft code for my factory navigation. Since the battery went dead, it just says "code" I called the dealer and they told me to get the code they need the serial # on the back of the radio, but the problem is that the factory radio is already gone, it has an aftermarket radio installed and no owners manuals or books came with the car that would have the code. If someone could tell me a way to get this 4 diget nav code I will gladly pay-pal them $50 for their help. Thanks.

Go to the dealer. It is a violation of the forum rules - the rules I *know you read* - when you signed up. This thread WILL get locked, I assure you.It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."