can you clarify the question. Do you mean the radio will not power up or if it does is it looking for a Code? If it's looking for a code check to see if the 4 digit code is written on a piece of paper stuck to the underside of the engine bay hood. Other wise you will have to get it for a Jag dealer providiing you have the VIN and proof of ownership
if the blower motor still works, somebody probably bypassed the heater core in the past.
turn it on
Check your fuse panel for a blown radio fuse.
first check your fuse panel located behind ashtray and change fuse if that doesnt work check your code in radio if stock
fuse
Yes you can, you have to splice into the correct wires since a normal wiring harness doesnt work.
Anytime a battery cable is removed from the battery the radio will need to have the clock reset and the radio stations re-programmed. (Helpfull)
Firstly you figure out how old the radio is. Then you take it to a mechanic and they might be able to take it out. If that doesnt work then your stuffed so get a new car.
it is most likely the fuse. I have a 1984 jaguar xj6 and i have had the same problem, my fix for it was that the fuse box was messed up and a lot of the fuses have to be half out to work. Just try testing the fuses and moving them around a bit to see if that will re-connect the instruments.
Check for a blown fuse.
It's an anti-theft device used to lock out (disable) the radio in the event that it is stolen. You need the code to unlock it. The code is provided to the owner when purchased and should be with the original paperwork. If you can't find it, you may have to take the car in to a Jaguar dealer and have them unlock it. Good luck. When new Jaguar put the radio code on a sticker on the underside of the hood sometimes these were never removed, so look there for a four digit code
maybe the fuses have blown because that happened to my radio and you might have to buy a new radio.