The cars came with two different amps.

Non dsp amps are plug and play with these radios other than running the one wire I mentioned.

DSP amps have a built in sound effect system and put out more power but if your car came with the navigation screen up from it wont stay on without it. That's where the programming comes in.

Using a special cable you can connect to the obd plug under the dash and program the car to think it didn't come with a navigation screen so it doesn't look for it and keeps the amp turned on.

__________________
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