With no nav and no dsp try just plugging into the harness in the dash and see what happens. If you get sound and if there is a place to plug the antenna into then your good to go.

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Just BMW's - All cars and trucks was two pages long
1994 318is
1997 528i
2000 323i
2001 X5 3.0 auto
2005 X5 3.0 auto
2011 535xi auto
2013 X5 xdrive35 Turbo
More are at my website

Aftermarket E53 Radio Install