Despite GM'* insistence that their analog OnStar can't be upgraded to digital under any circumstances, I recently discovered that the 2000-2002 Bonneville, Aurora, and LeSabre can be upgraded now. I entered some 2000/1 Aurora and LeSabre VINs on the OnStar website to verify and yes, it'* true!

But not the premium GM sedans like DeVille, Seville, and Park Avenue. And no GMT 900s, GMT 360s, N-bodies, or W-bodies.

Why?

I'm not sure who you were talking to, but GM has not taken the position that their analog OnStar can't be upgraded. It is vehicle dependant as upgrade kits are not offered for all models. There is however a long list of vehicles eligible, including 2000+ Bonnevilles.

I wonder why they don't like their premium cars?

What cars are you referring to? There are several Cadillacs eligible for upgrade along with many other GM lines. With the exception of a very few cars, they need to have been manufactured as Analog/Digital Ready. This pretty much limits cars to about the 2002 and newer era. There is an upgrade available for the Aurora, Bonneville and LeSabre that can be installed as far back as the 2000 MY.

Keep in mind, only vehicles already equipped with OnStar are eligible for the upgrade.

Does anyone know whether an update is planned for the 2002 Park Avenue?

Are any Park Avenue model years 'updateable'?