[ocgltd]

CadillacSTS2003 - thanks for the answer. If I understand your answer, my car's radio connects to external devices via the "Entertainment and Serial Data" bus. (Later models using the "data" bus which is different).

Here's where I'm confused...

According to the peripheral docs, the PXDX model works with sevilles 95-05 by unplugging the external CD changer and plugging in the PXDX. Their comment says plug in at the trunk (but of course the changer is in the console now). This suggests they all have the same data interface /bus - I think.??

Their doc for the PXGM24 says compatible with "2000-2007 GM Vehicles with Class-2 Data-bus radios (a.k.a. RDS radios). Connects to 24-pin radio harness.". But they only list the escalades as compatible. So..would this one work?

Wow this is complicated (or risky to spend $ if compatability is in question). I think I'll post another question just about the Peripheral products too (to keep this thread on topic)