Technical Cinq radio wiring

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Technical Cinq radio wiring

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Joined
Apr 15, 2012
Messages
81
Points
74
Location
Orkney, Scotland
Looking to replace the original tape deck in a '93 Cinq.
The car loom has a 6-pin connector for the radio, the tape deck has ISO connected, and as it stands at the moment there's an adapter between them.

Here's the 6-pin loom connector:
IMG_6990.JPG

- The 4 wires that don't have arrows pointing to them are the front speakers
- the black is earth
- the red/green wire is constant 12V

...but what is the purple wire that is also feeding into the same PIN as the constant 12V?
 
Model
Base
Year
1993
Mileage
77000
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