Technical Replace OEM Blaupunkt cassette radio with OEM CD radio

[crankshaft]

Hi,

I have a Punto mk2a that came with a cassette stereo radio.
Recently the radio died, and before the died the display was going blank for years.
I was thinking about replacing the radio for the OEM Blaupunkt CD version.
Is this doable? I think the radio is matched to the body ECU via the CAN? So if I get one from a scrap yeard it might not work?

The radios that came out with a CD reader were for the MK2b version, I think. While they fit in the MK2a version of Punto, are the wire harness the same?

I don't like the aftermarket look of radios and ideally I want to keep the OEM look. If possibly with a CD reader, if I can burn a CD to play my favorite tunes I would be happy enough.
It sucks not having a car radio, I liked it better when my car had sound.

 

[chevychase]

The mk2a radios had pins for both 12v permanent feed and 12v switched. The mk2b had radios that had only 12v permanent and a canbus connection control to enable switch on when ignition on. I've just replaced mine (mk2b) with aftermarket and wired in a switched live. I will test my old canbus controlled radio with this new wiring (canbus wires are cut) and see if it works.

 

[crankshaft]

The mk2a doesn't have a 12v switched from the ignition switch. It connects to the CAN to know if the ignition is on or off.
I believe the CAN also offers some form of pairing, that replaces the typical code that radios from this age had to prevent theft, but I don't know this for sure.
If you could test your it would be really appreciated.

Edit: I was looking at the wire diagram. It might have a 12 V switched wire from the ignition.
It definitely has CAN connected to it. but there is also a 12 V wire that I need to check it is is connected to the ignition or not. This wire comes from a 7.5 A fuse that also seems to be part of the instrument cluster and the electronic mirrors control.

 

[chevychase]

Had a check as promised, with the connector re-configured as per iso standard. The stereo turns on manually but gives a cancheck warning as I have cut those wires to us the pins elsewhere. It's been a long time since I had a mk2a but I do remember moving a wire to make it work but I think that was the permanent wire. Looking at the wiring connectors the mk2a has it's can connections on the smaller connector, the mk2b has them in the iso connector pins 1&3. The mk2b has a permanent feed on pin 4 the mk2a doesn't, the mk2a has has a switched live on pin 7 the mk2b doesn't. The can connections let the multi timer unit pair with the stereo allowing removal and fitment without having to input a code. If the radio is moved to another car the cancheck will prompt for a code which will then re-pair the radio to the new unit.

If fiat didn't change the can protocol between the mk2a and mk2b then I think you could fit a later OEM cd player but you would have to repin the connector to match the later std but it is a risk that it won't work.

Going aftermarket is a guaranteed way to make it work. Some aftermarket stereos don't look flashy and look very boring and OEM.

Edit. Actually the mk2a pinout shown doesn't show a canbus it is the CD CHANGER bus. What connections are shown on your stereo. Post a pic of the label. I have heard some later mk2a's adopted the mk2b wiring scheme.