89' BMW 525 Radio Wiring Questions

[skrilla22 10+ year member]

Ok i'm trying to install my buddys pioneer head unit in his car. He has a 1989 BMW 525i. He used to have an old blaupunkt in there but he spilled coffee on it so he asked me to change it out for him. When i took out the blaupunkt, i noticed that the colors for the bmw are a lot different. I tried looking for wiring diagrams, such as the12volt but have had no luck. Does anyone know where to get some information on this i am stuck.

So far i have

White/Purple - 12v

Brown - Ground

thats it.. any help would be greatly appreciated, thanks.

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[skrilla22 10+ year member]

ttt..

 

[mil81 10+ year member]

If you decide to test the wires for power, don't forget ths BMW's usually have a 12V common system. This means the + is sent through the chassis, and the "Ground" is sent through the wires.