recently replaced the battery on our wagon and ever since have been driving around in silence lol

been through the paperwork we have for the car, but cannot find the bleeding code!

what do i need to find out what is it?

also it looks like a CD/tape/radio one, but there is no multi changer in the boot, or a slot for a CD... but there are buttons for random/scan play etc. so where fook is that lol

its a 1998 406 estate, 2.0l petrol GLX if that helps