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Classic Mini DIY Guides
- Installing a Head Unit If you have a guide you would like to submit, please send it to guides @ miniprojects .co. uk You have 2 sets of wiring. The HU loom, and the car loom. Ok, the HU loom. This is made up of the wires; Red - Switched Live The Blue and white wire is only on certain HUs, as the remote wire gives out 12V so is often used for an electric aerial and/or amps. The Permanent Live is just that. It should
have 12V to it whether the car ignition is on or not. This should be fused
if you have to put one of these in, as some cars are not built to take head
units. The speaker channels....... Obviously, when wiring up the speakers to the HU, you need to keep some sort of consistancy. The speaker wire is likely to have something written on one side of it, use this as the positive side. The HU, when you look at the back, with the wires coming out of it, use the right hand side for instance of the two matching colours as the positive side. This will ensure you wire all the speakers to the HU in exactly the same way, meaning all of the speakers should be in phase. This matters a lot. Ok, at the car loom side........ You need to bare the wires and keep every wire seperate. I cannot emphasise the need to keep all of them away from each other, and don't turn the ignition on until you are happy. You need to be testing for the power wires,
and the earth wire. It is possible that these wires are seperate to the
speaker wires as quite often they are loomed up seperately. Next, turn the ignition on. You should now find another wire that is live. This is the switched live wire (you can test by turning the ignition off, and this will now lose the 12V feed) and should be connected to the Red wire on the back of the HU. The earth wire will be of the same gauge (thickness) as the 2 power wires. It will also be likely a plain dark colour, either black or brown. The speaker wires will likely be in pairs also, so it will leave one wire without a terminal, this is likely the earth wire. To test the speaker channels.......... The other way, and best way i find, is to
turn the HU on, and fade the speakers in turn. So, fade the speakers to the
front, and then say the left. This means, you will only get noise from this
speaker. Now, take the pair of White with grey striped speaker wires, and
touch them to the speaker wires in the car loom. When you get the noise
through the front left speaker, you have the right combination. Now do this
for all the speakers in turn. Try to keep the continuity though, by using
the stripes on the speaker wires or some writing or something to keep you
wiring them up the same way.
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