GM has invested $120 million in XM.
Ron Zarrella, president of GM North America, is a member of XM's board of directors.
GM plans to launch satellite radio in its 2002 Cadillac DeVilles and Sevilles this fall.
Honda has invested $50 million in XM.
Satellite radio was featured in Honda's Model X sport-utility concept unveiled this year. Model X's target market is college-age men involved in sports.
DCX has invested $100 million in Sirius.
DCX's commercial truck brands Freightliner and Sterling also will offer Sirius service.
Ford Motor Co.
Ford has invested $20 million in Sirius.
A launch is possible in the 2002 model year. Youth-oriented vehicles such as the Ranger pickup and the Focus are likely to lead the way.
BMW will offer Sirius Satellite Radio service.
Delphi and Visteon
Both companies will supply radio head units compatible with XM and Sirius.