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Okay, so the first stumbling block on my replacement head project arrived in the form of the Metra wiring guide (Metra 70-1857 Bose Integration Tuner Bypass) . First off, instructions are non existent with this product, which isn’t very comforting for a novice (like me!). There’s some general information and a wiring guide on the back of the pack and a tiny note inside the bag telling you where your amp’s located (which I knew).

To make things worse the bag the harness came in had been torn and taped back together, right through the wiring guide! I went to the Metra site expecting to find further help and at least wiring information (it says on the bag “for further information…”). I’m always too optimistic it seems and not only was there no further information online – there was NO information at all! With patience and help from my wife in translating the Spanish, I managed to decipher it. Just in case anyone else has a similar problem, I’ve reproduced the chart below:

Metra wiring color code

12 Volt Ignition/Acc Red
12 Volt Batt/Memory Yellow
Ground Black
Power Antenna Blue
Amp Turn-On Blue/White
Amp Ground Black/White
Illumination Orange
Dimmer Orange/White
Phone Mute Brown
Right Front + Gray
Right Front – Gray/Black
Left Front + White
Left Front White/Black
Right Rear + Violet
Right Rear – Violet/Black
Left Rear + Green
Left Rear – Green/Black

Note: When Black wire is not present, ground radio to vehicle chassis. All colors may not be present on all leads due to manufacturer’s specification.

Update: @1 April 2014

The above list is correct but I found this one which is a little more in line with what you actually see  in terms of connectors which is a bit more useful.

Wire Color Function
Black (thick cable) Antenna Cable
Red +12 Volt Accessory
Yellow +12 Volt Constant
Black (3) Ground
Blue Power Antenna
White RCA Left Front Channel
Gray RCA Right Front Channel
Green RCA Left Rear Channel
Violet RCA Right Rear Channel

 

Wire Color Function
Black (thick cable) Antenna Cable
Red +12 Volt Accessory
Yellow +12 Volt Constant
Black (3) Ground
Blue Power Antenna
White RCA Left Front Channel
Gray RCA Right Front Channel
Green RCA Left Rear Channel
Violet RCA Right Rear Channel

I found this on the Crutchfield website, which has a few other extra useful tips that I wish I’d have found earlier, including this handy wiring diagram (click to enlarge).

70-1857 Wiring Diagram

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