2003 espace radio head unit

I had a new battery fitted on my espace and the radio has lost its code. I cannot find the radio head unit to get the security number. I have found a unit in the glovebox and a unit under the front passengers carpet but none of these have this security number on them. The radio usually works with the remote control unit or from the steering column but the dash only shows ERROR. What is this unit under the passenger carpet. This unit under the seat does have some numbers on it i.e
Model No: 22SY223/62T
Indus : VDO: 0495027100276780
Prod No: FD 0202420001925
There is also another number: 8200 163
Is this the head unit and what numbers can I use for the security number?...or is there another unit in the car somewhere where this number is located. Thanks

2003 espace radio head unit