OEM Concept Radio

Xr2i

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Apr 19, 2016
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Good evening

I’ve just fitted an OEM Concept Cassette radio back into the car, after re fitting missing plugs back onto the loom all my speakers are working but the sub doesn’t appear to have any sound ??? Does is automatically work when the radio turned on ? Also what does the blue plug do on the back of the HU ? Is it canbus ? And how to I get the CD changer to work also ? Thanks lads.