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They are grouped nicely on the R32 head unit, there is 8 wires grouped together which are the speakers, and then 4 wires grouped which are constant, ACC, ground and illumination.

Grab a multi-meter (should have one before attempting anything electrical), and with the key out of the ignition, test each wire, one of them will be 12V+ (This is your cosntant, matches to the YELLOW wire of the new headunit).

Switch the ignition to ACC, re-check and there will be 2 x 12v+, the 2nd will be your ACC activation wire, this matches to the RED of your aftermarket headunit.

Now flick the headlights to park, and re-measure and you will have 3 x 12v+, the 3rd wire will be your illumination wire, this isn't always on aftermarket headunits, but if it is, it will be marked with ILL+, and this is what it goes to.

With grounding, run a new lead to a clean grounding point in the car, there is plenty of grounding areas in the R32 dash to ground off to, but sand back and make sure you have a clean contact.

For the speakers, they should be easy enough to ID the pairs, then it's a matter of temp connecting the pairs to 1 speaker output from the headunit to ID which speaker it is, then tag and mark them, and hook them up as per the colour/wiring diagram of your aftermarket headunit.

Good Luck :P

B.

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