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I spent a good while looking for this. It is not to my knowledge the same as the standard Alpine M-bus but has some pins different. Here is the closest I found. It is for an Acura which also at one time used Alpine audio components. Alpine has also appeared in Jaguar cars.
Alpine Pin# Acura Pin# Pin Name Pin Function Wire (ext) Wire (int.)
8 8 GND Ground Black Orange/White
6 6 BATT +12V Yellow Blue/White
7 7 ACC Accessory Red White
1 1 BUS Bus Green Red/White
3 3 B.G Bus Ground Black Orange/White
4 2 R Right Signal Red Blue/White
2 4 S.G Signal Ground Black White
5 5 L Left Signal White Red/White
Shell Shell Chassis Chassis Ground Black Chassis
Since you have a scope and/or meter you may be able to verify this without damaging anything. The problem I had was that when I connected audio sources to the signal leads I heard nothing, regardless of how I set the stereo controls. I suspect that some particular bit stream has to be sent on the bus between the cd drive and the main unit to get it switched over to external inputs.
I assume you have googled "alpine m-bus" or similar, which is how I got the above.
I put in an FM modulator from Audiovox which has line inputs. This one is hard wired between antenna and antenna input and has a dash-mounted switch to enable/disable. It does not work with the headphone outputs of an iPod or portable cd player because those outputs are about 10x lower than line level. My plan is to build a little booster/preamp for this.
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