The radio doesn't work on a 1989 jaguar xj6?
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