So only a registered dealer can do this!! CP is a facility the VW uses to combat the trade of stolen parts - the only way to remove CP errors is to connect to VW's FAZIT system back Wolfsburg. My understanding is that J525 is captured in the Component Protection constellation. Here's the screen shot for the MOST software switch (see the switch below the "yellow" box - I used this screen shot originally for another purpose):īut the most important issue (IMO) is the note that I have included in the CAN network diagram. So that's why I asked if you had enabled MOST - because if the amplifier isn't connected, MOST is not normally enabled on the MIB (it doesn't need to be enabled). This is an optical fiber cable that provides the audio/handshaking signal between the MIB and the amplifier - all communications are digital and dialogue between J794 and J525 uses what VW calls "MOST" (Media Oriented System Transport) protocols Also notice that J525 is connected to J794 (which is the MIB unit in the glove-box) via an arrangement that's known as "ring-topology". The thing to note in the network diagram is J525 (which VW calls "Digital Sound Package " control system) - this is the OEM 400W external amplifier. OK, let's start with the basics - here's the CAN bus topology for the audio set-up on a mk7 Golf:
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