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Connector C, C4 is the wake up from the CDR23 to the HAES amp. To make shure just measure on the CDR23 and on the amp if you get 12V when the CDR23 is turned on. But this wire does go also to a diagnosis port.
I wouldn't use or cut any OEM wiring harness for setting up a new system. Just leave it alone and make your own harness including speaker harness. So you can always go back to stock without any problems and you don't mess anything up – for example a bus system.
Regards, Markus
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