Attention
1. For cars without screen and DSP, this head unit is plug and play.
2 For cars without screen but with DSP. The installation is relatively complicated. You will need to connect the speaker cables separately to get audio and your original DSP will not work after installation.
3. For cars with screen but no DSP, this stereo is plug and play.
4. For cars with screen and DSP, this unit can support original car’s DSP after 2001.
The following is the link on how to check if your car has DSP:
BMW X5 E53 Car Stereo Head Unit Upgrade Buying Guide Installation