XM Satellite Radio will be offered on all of General Motors Corp.’s ’03 Cadillacs, making the brand the first from any auto maker to offer XM-ready satellite radios on all models.

The new ’04 Cadillac XLR luxury roadster and ’04 SRX midsize luxury SUV also will offer XM. Cadillac already makes XM available on its ’02 DeVille and Seville models.

GM, a strategic investor in XM, will offer the technology in 25 ’03 models to be launched this fall.