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I am currently working on upgrading the amp/speakers in my 07 335i sedan. The schematic was very helpful but I have enhanced it by adding the pin number on the harness( TYCO part #1-828882-1) that goes into the amplifier( located in left rear behind wheel well). The cleanest way to do this would be to get the matching harness to avoid cutting the factory wiring. This may involve some work on my part but it's better than cutting and having to splice the factory wiring. I am still looking for a place that sells the harness.
SUB LEFT
Red/White + pin 8
Brown/Yellow - pin 18
SUB RIGHT
Red/Blue + pin 6
Brown/White- pin 16
FRONT LEFT
Blue/White + pin 9
Blue/Brown – pin 19
FRONT RIGHT
Blue/Black + pin 17
Blue/Brown – pin 7
REAR LEFT
Yellow/Red + pin 1
Yellow/Brown – pin11
REAR RIGHT
Blue/Green + pin 12
Blue/Brown – pin 2
CENTER
Black/White + pin 5
Black/Brown – pin 15
REAR LEFT WOOFER
Yellow/Red + pin 14
Yellow/Brown – pin 4
REAR RIGHT WOOFER
Blue/Green + pin 13
Blue/Brown – pin 3
Pin 10 Red/Gray
Pin 20 Brown
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