I have a 1989 740GL (Australian) with a radio cassette head unit marked CR-4221 which was manufactured in Japan. This has failed and I'm looking at replacing it with a later model Volvo radio. Sometime in 1989 the power connections to Volvo radios were changed from an 8-pin connector to a 14-pin connector. Most importantly, I'm looking for information on the 14-pin connector (pin numbers, wire colours and wire functions). It would also be a help if anyone knew anything about the CR-4221 radio head (searches for this number have been unsuccessful). This information isn't absolutely essential, as I can go through the long process of identifying the wires manually. The odd thing about this unit is that there are more wires present than would appear to be necessary. A description of the head unit follows:

CR-4221 (Vovo part No. 1343181)
Other marking: 8Y099214A
Date code: 8811
Radio/cassette unit with the standard DIN power amplifier output socket and DIN graphic equalizer socket (cable mounted).
Looking at the rear, the power socket numbers and wire colours (from left to right) are as follows:

8. Blue/White
7. White/Blue
6. Red
5. Yellow
4. Blue (with 3A inline fuse)
3. Green (with 1A inline fuse)
2. Orange
1. Slate

Most of these wires end up in a 9-pin plug which connects to a socket in the wiring loom under the dash. The yellow wire is separately connected via an inline fuse and the orange wire ends up (together with a black earth wire) in a 2-pin socket, also connected to the wiring loom.

If anyone recognises this arrangement and has any information about it, I would be very grateful. I'm also seeking some general information about how the power antenna control line works. Am I correct in assuming that power to the antenna unit itself is continuous, and that the control line is taken high (to +12V) to erect the antenna?

Thanks in advance for any help you can give.
Andrew