Ilan: Thanks for the PM
My wiring diagrams are a little different, but they support your interpretation: there are ostensibly 2 x basic functions that the connector on the end of the Reverse Camera (RC) undertakes: 1= RC video signal & 2= RC control
The RC video function is clearly for the 5 x wires that directly connect between J503 and R189 (notice the dotted line circle in the wiring diagram above joining to the black wire (sheath) that connects to pin #24 on J503).
The RC control function is the remaining 3 x wires – being :
· Red wire: +12v to pin #4 ( this is a "Terminal 30" supply from Fuse 16 on the “C” fuse holder)
· Yellow wire: +12v to pin #3 (reverse signal that triggers the RC to open/close- it is supplied via the BCM on pin#28, socket C and it also connects to the right-side reversing light)
· Brown wire:Earth to pin #2
Since you have already confirmed that the RC video function is OK – I would grab a multi-meter and check the state of the 3 x RC control wires in the car's wiring loom at the RC connector (include a continuity test on the earth wire).
If the earth wire is OK and the +12 Volt wires appear at the RC connector when they should– logic dictates that the fault must be downstream of the connector. If so either dismantle the RC and trace fault, or source a second-hand RC from a wrecker
See you tomorrow
Don
Please don't PM to ask questions about coding, or vehicle repairs. The better place to deal with these matters is on-line, in the forum proper. That way you get the benefit of the expertise of the wider forum! Thank you.
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