My amp isn't getting power among a few other issues. I went through the pin outs and diagrams. I'm pretty sure that I have the wrong harness. The simple harness can't possibly work with my sound system. If I look at the current wiring and the Continental and Becker diagrams I see the problem:
- My current wiring does not use the B block (apparently this is unused in HiFi option/Nokia cars)
- My current wiring uses the C block pins to send the signals to the amp; the Continental diagram doesn't show that the C block pins are used for anything other than the C4 and C6 pins for SWRC.
- The only output to the amp on the Continental is the B block which explains why I have no sound because it is not being used
- I therefore need a harness that goes from the Continental B block to the existing harness C1 block. Do I also need a line-out converter (LOC)?
- Also, there is no ground pin in the Continental head B block. Does my amp need that?
- Reference https://rennlist.com/forums/993-forum/896189-installing-the-continental-tr7412ub-or-radio-6.html
If the above is correct then the other/M490 harness should work. This is what it is supposed to do:
Swap of Terminal 86s and 30 pins (switched and permanent 12V)
Wire for connection to Nokia/Bose amplifier power on circuit
Line Output Converter (LOC) for connection to existing amplifier
Looking at the picture it looks it is exactly what I need. It also means that not having option code M490 does not necessarily mean that the simple harness will work.